Opportunities and risks of FDI in China Dissertation

Opportunities and risks of FDI in China - Dissertation Example ...........................11 Discussions†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦....................................................15 Conclusions†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦..†¦.†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.16 Recommendations†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.17 Bibliography†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.19 Appendices†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚ ¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.†¦Ã¢â‚¬ ¦22 Abstract Over the last twenty years or so, Foreign Direct Investment in China has been successful. It started with a base of approximately nineteen million dollars in 1990 and by 1999; the stock of FDI had risen to three hundred billion dollars. China is the leading country among all developing countries in terms of FDI stock. Its FDI consists of Greenfield investment. Initially, the stock of FDI in China originated from Asia among other parts of the developing world. FDI has varying meanings when it comes to its application in different social and political grounds. For instance, in china, the notion of FDI has positive and negatives impacts depending on geographical locations of individuals, cultural beliefs and area of operation (private or public sector). Since 1980s, China has been gro uped among the countries that have been able to reap the benefits of FDI. For instance, in the past two decades or so, China’s economic growth rate has been increasing as the economy tries to move from the command economy to a market-based economy. This growth rate has been made possible by trade liberalization that has been ongoing across the globe. Introduction China is a Middle East country that has undergone a rapid economic growth rate in the recent past. In the past decade the economy has been experiencing a positive economic growth rate estimated at 12%. In conjunction with the economic growth rate, the government has decided to engage itself in numerous developmental activities for instance, infrastructure building, development of the financial sector, and technological advancement. The rate of growth has so far been stable and it is expected to remain the same in the foreseeable future. China has not been left behind in terms of FDI and it is actually among the count ries in the world that have managed to keep pace with the changes in the global world. However, Foreign Direct Investment (FDI) is a concept and a phenomenon that has gone beyond economies boundaries to encompass socio-cultural and political aspects. According to Fiss and Hirsch (2005), FDI in Chinese context means, â€Å"the emergence of capitalism, democratization, or globalization is marked by discursive struggles over their social and cultural impacts, and the outcome of these struggles may facilitate or impede the transformation’s widespread acceptance† p29. There are several research studies that have been conducted on FDI in china but very little have been done on the opportunities and risks experienced by FDI in the Chinese economy. The research activities have mainly focused on the stocks of FDI in general and have not actually done much in relation to how this is affected by the social and economic stability in

Reaction paper about a video Essay Example | Topics and Well Written Essays - 250 words

Reaction paper about a video - Essay Example ng of age† story and parallelized to the coming of age of America at a time when so much turmoil, fear and emotionalism was being experienced by the nation. I know that this would appeal to audiences young and old alike because of its multiple features – style and creativity which may appeal to the youth and historical facts and intrigues that may captivate the older members of the audience. The character of Andrew Jackson was an enigma that was slowly demystified throughout the show. First packaged as a democratic president who always yielded to the will of the people, the interview in the video revealed that in reality he was a â€Å"decider† who was known for ousting Native Americans from their homes to â€Å"cleanse† the race. For conservative viewers, the play may be seen as too controversial due to the bold depiction of the story, but for the more modern thinkers, it may be seen as a liberating experience. The director was successful in bringing out hushed opinions in an acceptable way. An example is the tackling of â€Å"backroom deals† of the president through song and dance. The play made me think deeper into my own views of democracy and leadership, and has led me to believe that like in all things, a perfect balance needs to be achieved no matter how difficult it may seem to be especially if a multitude of people is affected by my

Development of CT Scans for Cancer Studies

Development of CT Scans for Cancer Studies According to the statistics presented by the World Health Organization (WHO), with around 7.4 million deaths (around 13% of the total death) in 2004, cancer is the leading cause of death throughout the world (WHO, 2009). These levels are expected to rise further in future, with an estimated 12 million death in 2030 (WHO, 2009). There are more than 100 different types of cancer (Crosta, n.d.), among them the Lung cancer, stomach cancer, colorectal cancer, liver cancer and the breast cancer are the most common types. Tobacco is the most important risk factor for cancer, with nearly 1.3 million deaths per year just due to lung cancer alone (WHO, 2009). Cancer At the primary level, human body consists of large number building blocks, called the cells. Under normal circumstances, new cells are formed by the body depending on the body requirement, in order to replace the dead cells. But sometimes, under abnormal conditions, there is an exponential (uncontrolled) increase in the formation and growth of new cells. The accumulation of these extra cells forms mass or lumps of tissues, called the tumor (National Cancer Institute, 2010). Most of the cancers, in general form tumors, but there are certain exceptions, like leukemia, that do not form tumors (in leukemia or blood cancer, the cancer cells hinder the normal blood functions due to abnormal cell disintegration in the blood stream (Crosta, n.d.)). The tumors can be of two types; benign tumor and malignant tumor. The benign tumors do not propagate to other sections of the body and have restrained growth (Crosta, n.d.), whereas the malignant tumor cells have the ability to invade into the sur rounding tissues. Also the malignant tumor cells can escape from their initial location and spread to other sections of the body through blood or lymph. Only the malignant tumors are cancerous in nature. Therefore, the cancer has three distinctive properties that distinguish malignant tumors from benign tumors: Uncontrolled growth Invasive nature Metastasis (ability to spread to other sections of the body) These disorders in cells are the result of the interaction between the genetic factors and external agents (which are called carcinogens) (WHO, 2009). The carcinogens can be categorized as (WHO, 2009): Biological carcinogens, like certain bacteria, viruses or parasites. Physical carcinogens, which includes the high energy radiations (ionizing radiations). Chemical carcinogens, these include substances like tobacco smoke, arsenic (water contaminant), aflatoxin (food contaminant), asbestos etc. Another factor essential in the development of cancer is the age. According to the studies conducted by the Cancer Research UK, the risk increase predominantly with increasing age, with nearly 74% of the cases of cancer diagnosed in people aged 60 and above (Cancer Research UK, 2009). Cancer Treatment Principle In case of normal cells there is specific pattern of growth, division and death (orderly destruction of cells is called apoptosis) (Crosta, n.d.). It is known that the cancer is the result of the uncontrolled growth of cells which do not die (Crosta, n.d.), that is, the apoptosis process fails in the cancer cells. The cancer cells thus do not die and rather continue to grow, resulting in the formation of tumors. As the problem in the cancer cells lies in the DNA, therefore a possible treatment of cancer is the destruction of the DNA in cancer cells, leading to a self initiated destruction of the cells. There are various methods used for the treatment of cancer depending upon the type of cancer. The most common types of treatment are (Fayed, 2009): Surgery Chemotherapy Radiation therapy or Radiotherapy Biologic or Targeted Therapy Radiotherapy Radiotherapy, also referred to as radiation therapy, is one of the most common types of treatments used for cancer. It is the utilization of higher energy radiations like x-rays, gamma rays in order to kill cancer cells, treatment of thyroid disorder and even some blood disorders, in a particular section (effected part) of the body (Nordqvist, 2009). The high energy ionizing radiations can be produced using a number of radioactive substrates like Cobalt (60Co), Radium (228Ra), Iodine (131I), Radon (221Rn), Cesium (137Cs), Phosphorus (32P), Gold (198Au), Iridium (192Ir), and Yttrium (90Y) (Howington, 2006). The cancer cells have the ability to multiply faster than other body cells. The high energy ionizing radiations are more destructive towards the faster growing cells, and thus they damage the cancer cell more than the other body cells (Mason, 2008). These high energy radiations like gamma rays and x-rays; especially damage the DNA inside these cancer cells (or tumor cells) thereby annihilating the ability of the cells to reproduce or grow. Apart from treatment of cancer, radiation therapy is also used to shrink a tumor before being surgically removed (Mason, 2008). Depending upon the method of irradiation, the process of radiation therapy is categorized into two forms (Mason, 2008): External Radiotherapy In this method (more common), the infected part of the body (tumor) is irradiated by high energy x-rays from outside the body. Internal Radiotherapy For this method, a radioactive substance are injected (or taken orally) into the body (close to the tumor) in the form of fluids. These substances, taken up by the cancer cells, radiate the tumor through internal beam radiation (or interstitial radiation) (Mason, 2008). Radiotherapy Planning A careful planning is essentially required for radiation therapy, as over exposure can be critically dangerous to healthy tissues in the body. The ionizing radiations have side effects, therefore once the full dose of radiations is decided; the patient is given these radiations in the form of small doses in a series of therapy sessions (Cancer Research UK, 2009). Each small dose of radiation is called a fraction. The gap between sessions provides the recovery time for the body, which may depend on the type of cancer and patients health condition. The area of the body that is radiated during the treatment is called the radiotherapy field and the section inside the body that experiences the maximum exposure dose is called the target volume (Cancer Research UK, 2009). The doctors decide the marginal area around the tumor that should be radiated to encapsulate any movement of the cancer cells. In order to accurately determine the position of tumor (or target volume), body scans are done. Computed Tomography (CT) scans are done as a planning procedure, this provides vital information regarding the location of the tumor as well as the kind of treatment required by the patient (Cancer Research UK, 2009). The radiotherapy treatment planning process can be divided into 6 major steps . Computer Tomography (CT) Scan The invention of Computer Tomography (CT) scanned is credited to Sir Godfrey Hounsfield in early 1970s, for which he along with Allen Cormack, was awarded the Nobel Prize in 1979 (Smith, n.d.). A CT scanner, also known as the Computed Axial Tomography (CAT) scanner uses X-rays to produce cross sectional images (or slices) of the body like a slice in a loaf of bread (FDA, 2010). The word tomography suggests the process of generating a two-dimensional image of a slice or section through a 3-dimensional object (a tomogram) (Nordqvist, 2009). These cross-sectional slides render an accurate picture of the size and location of the tumor along with the position of major organs in the body (Cancer Research UK, 2009). This would be essentially useful during the radiotherapy process, where these can be used to lower the dose of radiations on the organs. It is known that in case of radiation therapy treatment, the doses are given in fractions over a certain period of time (to prevent major side effects), which may vary from few weeks to months. Thus, before each fraction of radiation dose, computed tomography (CT) scan of the patients is done to determine the exact location of the tumor or cancer cells. So in case the full dose has been divided into 30 fractions, then the patient has to undergo 30 CT scans, each before a fractional therapy. The machine used for the radiation therapy planning is known as the simulator (Cancer Research UK, 2009). The simulator identifies the position of the tumor and marks the position of radiation on the body with the help of light rays. The radiographer uses ink markers on the body before the actual radiotherapy is begun. These linear ink marks are used by the radiographer for positioning the machine for radiotherapy (Cancer Research UK, 2009). Simulators take the pictures (CT scans) in the form of X-rays, which locates the accurate tumor position for the radiographer to carry out the treatment. During a CT scan, it is essential that the person remains completely still so that the measurements are accurate. In order to insure the correct position supports like neck rest, chest board or arm pole are used (Cancer Research UK, 2009). In case of children it is ensured by giving proper sedatives. Sometimes, under critical condition, extra measures are taken in order to prevent essential organs from being radiated during the therapy. These measures include injecting fluids or dyes which mark the position of vital human organs in the CT scan (Cancer Research UK, 2009). These markers may be given orally, through injections or rectally depending upon the requirement. Using this vital information from the CT scans, a treatment plan for radiation therapy is prepared. This plan indicates the position and direction of the radiations during the therapy, so as to minimize the exposure of healthy cells and organs. The scans generated by a CT scanner are in the form of 2 dimensional (2-D) slides, but by the used of digital geometry processing they can be used to generate a 3 dimensional (3-D) images of the body (Nordqvist, 2009). This can be achieved by integrating all the slides (along the same axis) together using a computer system. The CT scan can be understood as a technically advanced format of X-rays machines. The x-rays images are produced by the projection of a broad beam of x-rays on a film after passing through the body (Medindia, 2010). It provides a 2-dimentional projection of the body, where much of the information is lost. In case of CT scan, a thin beam of x-rays is absorbed by the detector after passing though the patients body (Medindia, 2010). Like the x-ray process, the CT scanning is a painless process for the patients but has been known to be accompanied with some side effects. These side effects may vary from the patient to patient depending upon the amount of radiation dose and health of the patient. The detailed discussion on the health effects of CT scanning has been discussed in the later sections of the project. Theory In order to understand the working of a computed tomography (CT) scanner it is essential to understand the properties of ionizing radiations (X-rays) used in the scanning process. The electromagnetic radiations are the arrangement of electric-field and magnetic-field vectors perpendicular to each other and also perpendicular to the propagation direction of the wave (Resnick et al., 2009). These Electromagnetic radiations have penetrating powers, which are directly dependent on the energy (or frequency) of these radiations. So that radiations with higher frequency have higher penetration powers. Therefore, on the basic the energy, the electromagnetic radiations are categorized as Non-ionizing radiations and Ionizing radiations. Non-Ionizing radiations refer to the electromagnetic radiations which have energy lower than that required for an atomic ionization (MIT, 2001). The non-ionizing radiations include radio waves, micro waves, visible light etc. These radiations have lower penetration powers. Alternatively the Ionizing radiations are the high frequency radiations which have enough energy to knockout an electron from an atom and thus causing ionization (MIT, 2001). The Gamma rays and X-rays are the common type of ionizing radiations. Even the alpha particles and beta particles emitted in a nuclear reaction are ionizing radiations (MIT, 2001). Due to the higher energy they have higher penetration power than the non-ionizing radiations. Principle of CT Scanning The most important section of a Computed Tomography (CT) scanning is the interaction of the ionizing X-ray radiations with the living tissues in the body. When the ionizing radiations (X-rays) interact with the living tissues in the body, they break up atoms and molecules from the living tissues and disrupt chemical reactions within the body (Zamanian Hardiman, 2005). The intensity of absorption of the x-ray radiations by the body varies depending upon the tissue coming in interaction. Different body tissues have different absorption power, where some are permeable to x-rays others are impermeable (Medindia, 2010). It is due to this difference in the absorption ability of different sections of the body, which results in the generation of a graded pattern in the scans. High density tissues like the bones appear white in the scan while the soft tissues (like brain and kidneys) appear dark. The cavities (like the lungs) are seen as black sections in the scan (Medindia, 2010). Therefore, this gradation in the pattern can be used as method to distinguish different body organs depending upon their absorption capacity. This forms the basic principle behind the working of an X-ray scanning. Radon (1917) was the first to develop the principles of computed tomography (CT) mathematically (Bushberg et al., 2002). According to Radon, with the help of infinite number of projections through an object, it could be possible to produce an image of an unknown object. In case of film imaging (as in conventional X-rays), a two-dimensional (2-D) projection of the body is generated on the film. Due to this, details in the dimension of the body along the direction parallel to the x-ray beam are lost. In order to overcome this drawback (only up to a certain level) projections can be taken along two directions; posteroanterior (PA) projection and lateral projection (Bushberg et al., 2002) (as shown in Figure 4). Increasing the number of scans improves the amount of information but in critical and complex cases where much more details are required. For these critical cases, CT scan is done. The CT scan provides the tomographical image, which is the picture of patients body in the sections or slabs. The thickness of these uniform slabs may vary from 1 millimeter to 10 millimeter (Bushberg et al., 2002), according to the program, depending upon the requirement. Each CT image consists of an array of large number of pixels forming a two dimensional (2-D) image, which corresponds to the same number of three dimensional thin rectangular slabs called the voxel. The voxels are the volume element whereas the pixels are the picture element (Bushberg et al., 2002). Every ray from the X-ray source passes (transmits) through the patient before the transmission measurement is done by the detector. Intensity of the un-attenuated x-ray radiation emitted by the source is Io whereas the intensity of the attenuated radiation after transmitting through the patient is given as It. The intensities Io and It are related by the equation (Bushberg et al., 2002):   Ã‚  Ã‚  Ã‚  Ã‚  It=Ioe-ÃŽ ¼t   Ã‚  Where;   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚ µ is the total linear attenuation coefficient of the tissue (Smith, n.d.).   Ã‚  Ã‚  Ã‚  Ã‚  t is the distance travelled by the radiation in the tissue i.e. the tissue thickness. The coefficient  µ is dependent on the atomic number and electron density of the tissues (Smith, n.d.). Higher the atomic number and electron density of the tissues, higher would be the attenuation coefficient (Smith, n.d.). This form the basic principle of CT scanning, that different tissues have different level of attenuation properties depending upon their atomic number and electron density. For every measurement, the overall attenuation coefficient is calculated using the above equation. During a complete 360o ­ scan, various transmission measurements for the intensity of X-ray photon are done. Using these intensity measurements specific attenuation values are allotted to every voxel (volume element). These attenuation numbers are directly proportional to the linear attenuation coefficient. The average of these attenuation values is called the CT number (Smith, n.d.). These values can be arranged on a linear scale, the units of which are called the Hounsfield units (HU). The scale for modern CT scanners varies from approximately -1,000 to 3,000 HU. The attenuation scale is based on binary system and therefore the exact values range from -1,024 to +3,071, with a total of 4,096 (or 212) attenuation numbers. Here, the lower represent the black section while the higher values represent the white section of the CT image. On this scale the attenuation value of water is zero HU and that of air is -1,000 HU (Smith, n.d.). Both of these values act as the reference points. Construction of a CT scanner CT scanner is a complex machine, but the basic structure is simple. A common CT scanner has been shown in Figure 2. Two most important parts of a CT scanner are the X-ray source and detector. The source and detector are placed in a circular structure, which has a shape similar to a doughnut. This doughnut shaped circular opening is called the gantry (RadiologyInfo, 2009), with an inner (opening) diameter varying from 60 cms to 70 cms. The X-ray source and detector are placed exactly (diagonally) opposite each other, so that the radiations emitted by the source pass through the body and the transmitted radiations are measured by the detector. The x-ray source and detector system in the gantry is motorized to rotate around the patient for measurements in different projection angles. The rational speed of the system is adjusted according to the detectors ability to measure and convert the x-ray beam into electronic signal. Cobalt (60Co) is generally used as the source of x-rays in the CT scanners. The detector used in CT scanner consists of an array of detectors in a slightly curved shape (like a banana). This curved shape is especially useful in fan-shaped beam projects. Two types of detectors are generally utilized in the CT scans; solid state or scintillation detector and Xenon gas detector (Reddinger, 1997). But the solid state detectors with scintillators like Cadmium Tungstate (CdWO4), yttrium, gadolinium ceramics etc are commonly used (Bushberg et al., 2002). The principle of the scintillation detector is that, when it is struck by a x-ray photon, it produces light. This light signal is then transformed to electrical signal with the help of photodiode. The Depending upon their structure, the detectors are categorized into two categories; single detector array and multiple detector array. Another essential part of a CT scanner is the motorized examination table. The table is controlled to move in and out of the gantry during the scanning process. As the position of the x-ray source and detector is fixed therefore the section being scanned is controlled by the movement of the examination table. For a better scan it is necessary that the patient remains completely still. To insure this table is equipped with neck rest, chest board and arm pole (Cancer Research UK, 2009). The detector measures the intensity of the radiation and converts them into electrical signals. These raw signals are analyzed and manipulated by the computer to convert them into images which can be understood by the radiologists and the technicians. Multiple computers are required in a CT scanner. The main computer that controls the operation of the entire system is called the host computer (Imaginis, n.d.). The computers and controls are located in a room adjoining the scanning room. This prevents the technicians and the radiographer from exposure to x-rays. Scanning Procedure in a CT scanner Initially the patient is positioned on the examination (or scanning) table in a flat upright posture (face towards the roof). In order to insure the correct and stationary position, straps and pillows may be used along the body. Once the patient is correctly positioned on the scanning table, the motorized table moves the patient into the circular opening of the CT scanner (FDA, 2010), which the x-ray radiations are projected on the patient from the scanning. For a particular position of the x-ray source and detector, the rays from the source pass through a region called the projection or view. There are two different types of projection geometries that are used in CT scanning; parallel beam geometry and fan beam geometry. In the parallel beam geometry, the rays projected on the patient are parallel to each other whereas in fan beam geometry, the rays diverge from the source in the shape of a fan (Bushberg et al., 2002) as shown in Figure 7. The fan beam projections are the most commonly in used x-ray projections in the CT scanners. The X-ray tube is attached with a collimator which controls the thickness of the fan beam. This thickness (of the fan beam projection) determines the width of the tissue slide in the scanning process. It is through the collimator that the slice thickness is varied between 1mm to 10mm (Smith, n.d.). The x-ray source and detector rotate around the patient (for imaging) in a circular motion such that they always remain exactly (diametrically) opposite to each other (as shown in Figure 7). During the rotation the source keeps emitting x-rays which are attenuated after passing through the patient. For a single projection (or slice), the x-ray source and detector make a complete 360o rotation around the patient. During the rotation the detector takes a large number of snapshots of the absorbed X-ray beam at different projection angles. A single image may involve approximately 800 rays and there can be up to 1,000 different projection angles (Bushberg et al., 2002). Therefore for a single projection (one slice), the detector does nearly 800,000 transmission measurements (Bushberg et al., 2002). The scanning of a single projection generally takes around 1 sec (for axial CT scanners) (FDA, 2010). Once all the transmission measurements (complete 360o) for a projection (or slice) are completed, the motorized table moves along the axis of the gantry so that the next slice of tissues forms the projection view. The process is continued till the complete required section of the body has been scanned. In the traditional CT scanners, the table moved on to the next projection (slice) only when the scanning of the previous was completed. Such conventional type of scanning is called the axial scanning. But in modern CT scanners, called the helical or spiral CT scanners, the rotation of the x-ray source and detector is accompanied with the uniform movement of the examination table, thus producing a helical projection. The helical CT scanning has been shown in Figure 9. These modern helical CT scanners are much faster than the traditional scanners due to continuous scanning process. They have been reported to take nearly half the time for scanning as compared to the traditional CT scanner s. In order to analyze and study the cardiac structure which is under constant motion, even helical CT is ineffective. For such applications a special CT scanner with an exposure time of 50ms and a maximum exposure rate of 17 images per second are used (Smith, n.d.). These scanners, called the cine CT, freeze the cardiac motion due to extremely low exposure time resulting in a sharp image (Smith, n.d.). These scanners use electron beam to generate x-rays, thus are also known as Electron Beam Computed Tomography (EBCT). In the CT scanning process large volume of data and operations are required to be processed, which is achieved with the help of multiple computers. The detector converts the intensity measurements of the attenuated x-rays in to electrical signals. The main computer, called the hub computer processes these signals and converts them into an image. These images can then be analyzed for radiotherapy planning. Result Computed Tomography (CT) has become an invaluable medical tool. It provides detailed 3-D images of various sections of the body like pelvis, soft tissues, lungs brain, blood vessels and bones (Nordqvist, 2009). Generally, CT scanning is the preferred method of diagnosing different types of cancers like liver, lungs and pancreatic cancers (Nordqvist, 2009). The tomographic images produced by the CT scan provide specific location and size of the tumor along with the details of affected tissues in the proximity of the tumor. This is especially advantageous in planning, guiding, and monitoring therapies like radiotherapy (FDA, 2010). CT scanning has various benefits over other traditional diagnostic techniques; some of the benefits are (RadiologyInfo, 2009): It is non-invasive, painless and extremely accurate. A major advantage is the ability to identify and distinguish bones, soft tissues and blood vessels in the same image. It also provides real time images which cannot be done in conventional X-rays. This technique is fast and simple; and is extensively used to locate internal injuries after accidents. It is less sensitive towards patient movement as compared to MRI. CT scanning can be used on patients with medical implants unlike the MRI. For an effective radiation therapy treatment, it is necessary that only the tumor is irradiated while minimum damage occurs to the surrounding health (normal) body tissues (Badcock, 1982). This is achieved with the help of CT imaging technique. In a study by Badcock (1982), 186 patients with various malignancies were studied and it was found that in nearly 39% of the treatment cases CT scanning was valuable in the assessment of the radiationdose calculation (Badcock, 1982). According to his study, CT scanner resulted in an alternation in target dose by more than 5%, (as compared to the traditional methods) in 27% of the patients (Badcock, 1982). The result has been shown in the table below. The mean alternation was 6.5% of the target dose and usually resulted in reduction of dose per fraction by factors upto 35% (Badcock, 1982). Even with these advantages, the adverse affect of the ionizing x-ray radiations cannot be neglected. Various experiments and researches have consolidated the fact that ionizing radiations like x-rays, gamma rays etc have adverse effect on living tissues. Zamanian Hardiman (2005) have explained that when high energy ionizing radiations interact with living tissues they strip-off atoms and molecules from them. This disrupts the chemical reaction within the body and failure in organ functioning (Zamanian Hardiman, 2005). The adverse effects of ionizing radiations were seen shortly after its discovery in 1890s, with a scientist involved in the study of radioactivity were reported with skin cancer in 1902. But is was not until 1944, that the role of radiations in causing leukemia in human was first documented, mainly in radiologists and physicists (Zamanian Hardiman, 2005). In recent years the use of x-rays has extensviely increased in medical field for diagonostic and treatment application. According to the U.S. Environmental Protection Agency, X-ray deveices are the largest source of man-made radiation exposure (US_EPA, 2007). According to NCRP Report No. 160 (2006), the average annual effective dose per individual in the US population, from all sources has increase from 1.7mSv in 1980s to 6.2mSv in 2006. This increase is mainly attributed to the striking growth of high dose medical imaging procedures that utilize x-rays and radionuclides (NCRP, 2008). Such man-made devices include X-ray machines, CT scans etc. CT scans, especially result in high dose x-ray exposure, with nealy 100 times the exposure dose as compared to standard x-ray equipments (Coach, 2008). Some of the major risks associated with CT scanning are: It is well documented that ionizing radiaitons like x-rays have the ability to cause cancer on exposure. Therefore, the CT dose in radiotherapy increase the probabilty of cancer in the future. Even though only 4% of the total x-ray examinations are CT scans, they account for more than 20% of the radiation dose to the population by medical x-rays (King Saud University, 2004). In general, the effective dose in a CT scan procedure ranges from 2 mSv to 10mSv, which is nearly equivalent to the amount of radiation that a person receive from the background exposures in three to five years (RadiologyInfo, 2009). A CT scan during preganacy make cause serious illness or even birth defects in the unborn baby (FDA, 2010). Children are more sensitive and vulnerable to x-ray exposures than the adults, therefore their CT scanning should be done only under extremely essential and necessary conditions. Women have higher risk of developing cancer in the lifetime, as compared to men under same levels of exposure (FDA, 2009). In some rare situation of high-dose prolonged radiation exposure, the x-rays can cause adverse effects like skin reddening (erythema), skin tissue injury, hair loss, cataracts etc (FDA, 2010). In a study, Sawyer et al (2009) estimated the effective dose resulting from a cone beam CT scanning for planning of radiation therapy using thermoluminescent dosemeters (TLDs) for organ dose and using International Commission on Radiological Protection (ICRP) 60 tissue weighing factor (Sawyer et al., 2009). The results obtained for effective dose from TLD measurements and ICRP 60 weighting factor, for breast, pelvis and head simulation have been shown in the table below. The scanning process results in the exposure of the normal tissues outside the treatment volume (Waddington McKenzie, 2004). It is thus important to analyze the effect that the irradiation caused by the CT scanning process has on the patients body. In a study, Waddington McKenzie (2004) analyzed the propability of developing cancer from the irradiations caused by the extended field portal imaging techniques, the results of which are given in the table below (Waddington McKenzie, 2004). In order to illustrate a real life situation, the calulations in the study were done for an average man with a height of 170 cms and weight of 70 kgs (Waddington McKenzie, 2004). Therefore, these values may change depending upon the height, weight and tumor size of the patient. Discussion Various studies have been done to statistically evaluate the effect of the ionizing radiations on the human health. These risks have severely amplified due to the rapid increase in the number of CT scans for diagnostic applications. CT scans form nearly 5% of all procedures used in diagnostic radiology in the developed countries (Wrixon et al., 2004). In U.S., nearly 70 million CT scans were done in 2007 as compared to just 3 million done in 1980 (Steenhuysen, 2009), this includes more than 4 million children in 2006 (Brenner Hall, 2007). Thus, according to the NCRP Report no. 160, the average radiation dose per person has increased from 3.6 mSv in early 1980s to 6.2 mSv in 2006 (NCRP, 2008). Steenhuysen (2009) has reported that the radiations from CT scans done in 2007 will cause 29,000 cancers and kill nearly 15,000 people in America (Steenhuysen, 2009). These stats explain the level of exposure caused by the CT scans. According to estimates by Amy Berrington de Gonzalez of the National Cancer Institute, Development of CT Scans for Cancer Studies Development of CT Scans for Cancer Studies According to the statistics presented by the World Health Organization (WHO), with around 7.4 million deaths (around 13% of the total death) in 2004, cancer is the leading cause of death throughout the world (WHO, 2009). These levels are expected to rise further in future, with an estimated 12 million death in 2030 (WHO, 2009). There are more than 100 different types of cancer (Crosta, n.d.), among them the Lung cancer, stomach cancer, colorectal cancer, liver cancer and the breast cancer are the most common types. Tobacco is the most important risk factor for cancer, with nearly 1.3 million deaths per year just due to lung cancer alone (WHO, 2009). Cancer At the primary level, human body consists of large number building blocks, called the cells. Under normal circumstances, new cells are formed by the body depending on the body requirement, in order to replace the dead cells. But sometimes, under abnormal conditions, there is an exponential (uncontrolled) increase in the formation and growth of new cells. The accumulation of these extra cells forms mass or lumps of tissues, called the tumor (National Cancer Institute, 2010). Most of the cancers, in general form tumors, but there are certain exceptions, like leukemia, that do not form tumors (in leukemia or blood cancer, the cancer cells hinder the normal blood functions due to abnormal cell disintegration in the blood stream (Crosta, n.d.)). The tumors can be of two types; benign tumor and malignant tumor. The benign tumors do not propagate to other sections of the body and have restrained growth (Crosta, n.d.), whereas the malignant tumor cells have the ability to invade into the sur rounding tissues. Also the malignant tumor cells can escape from their initial location and spread to other sections of the body through blood or lymph. Only the malignant tumors are cancerous in nature. Therefore, the cancer has three distinctive properties that distinguish malignant tumors from benign tumors: Uncontrolled growth Invasive nature Metastasis (ability to spread to other sections of the body) These disorders in cells are the result of the interaction between the genetic factors and external agents (which are called carcinogens) (WHO, 2009). The carcinogens can be categorized as (WHO, 2009): Biological carcinogens, like certain bacteria, viruses or parasites. Physical carcinogens, which includes the high energy radiations (ionizing radiations). Chemical carcinogens, these include substances like tobacco smoke, arsenic (water contaminant), aflatoxin (food contaminant), asbestos etc. Another factor essential in the development of cancer is the age. According to the studies conducted by the Cancer Research UK, the risk increase predominantly with increasing age, with nearly 74% of the cases of cancer diagnosed in people aged 60 and above (Cancer Research UK, 2009). Cancer Treatment Principle In case of normal cells there is specific pattern of growth, division and death (orderly destruction of cells is called apoptosis) (Crosta, n.d.). It is known that the cancer is the result of the uncontrolled growth of cells which do not die (Crosta, n.d.), that is, the apoptosis process fails in the cancer cells. The cancer cells thus do not die and rather continue to grow, resulting in the formation of tumors. As the problem in the cancer cells lies in the DNA, therefore a possible treatment of cancer is the destruction of the DNA in cancer cells, leading to a self initiated destruction of the cells. There are various methods used for the treatment of cancer depending upon the type of cancer. The most common types of treatment are (Fayed, 2009): Surgery Chemotherapy Radiation therapy or Radiotherapy Biologic or Targeted Therapy Radiotherapy Radiotherapy, also referred to as radiation therapy, is one of the most common types of treatments used for cancer. It is the utilization of higher energy radiations like x-rays, gamma rays in order to kill cancer cells, treatment of thyroid disorder and even some blood disorders, in a particular section (effected part) of the body (Nordqvist, 2009). The high energy ionizing radiations can be produced using a number of radioactive substrates like Cobalt (60Co), Radium (228Ra), Iodine (131I), Radon (221Rn), Cesium (137Cs), Phosphorus (32P), Gold (198Au), Iridium (192Ir), and Yttrium (90Y) (Howington, 2006). The cancer cells have the ability to multiply faster than other body cells. The high energy ionizing radiations are more destructive towards the faster growing cells, and thus they damage the cancer cell more than the other body cells (Mason, 2008). These high energy radiations like gamma rays and x-rays; especially damage the DNA inside these cancer cells (or tumor cells) thereby annihilating the ability of the cells to reproduce or grow. Apart from treatment of cancer, radiation therapy is also used to shrink a tumor before being surgically removed (Mason, 2008). Depending upon the method of irradiation, the process of radiation therapy is categorized into two forms (Mason, 2008): External Radiotherapy In this method (more common), the infected part of the body (tumor) is irradiated by high energy x-rays from outside the body. Internal Radiotherapy For this method, a radioactive substance are injected (or taken orally) into the body (close to the tumor) in the form of fluids. These substances, taken up by the cancer cells, radiate the tumor through internal beam radiation (or interstitial radiation) (Mason, 2008). Radiotherapy Planning A careful planning is essentially required for radiation therapy, as over exposure can be critically dangerous to healthy tissues in the body. The ionizing radiations have side effects, therefore once the full dose of radiations is decided; the patient is given these radiations in the form of small doses in a series of therapy sessions (Cancer Research UK, 2009). Each small dose of radiation is called a fraction. The gap between sessions provides the recovery time for the body, which may depend on the type of cancer and patients health condition. The area of the body that is radiated during the treatment is called the radiotherapy field and the section inside the body that experiences the maximum exposure dose is called the target volume (Cancer Research UK, 2009). The doctors decide the marginal area around the tumor that should be radiated to encapsulate any movement of the cancer cells. In order to accurately determine the position of tumor (or target volume), body scans are done. Computed Tomography (CT) scans are done as a planning procedure, this provides vital information regarding the location of the tumor as well as the kind of treatment required by the patient (Cancer Research UK, 2009). The radiotherapy treatment planning process can be divided into 6 major steps . Computer Tomography (CT) Scan The invention of Computer Tomography (CT) scanned is credited to Sir Godfrey Hounsfield in early 1970s, for which he along with Allen Cormack, was awarded the Nobel Prize in 1979 (Smith, n.d.). A CT scanner, also known as the Computed Axial Tomography (CAT) scanner uses X-rays to produce cross sectional images (or slices) of the body like a slice in a loaf of bread (FDA, 2010). The word tomography suggests the process of generating a two-dimensional image of a slice or section through a 3-dimensional object (a tomogram) (Nordqvist, 2009). These cross-sectional slides render an accurate picture of the size and location of the tumor along with the position of major organs in the body (Cancer Research UK, 2009). This would be essentially useful during the radiotherapy process, where these can be used to lower the dose of radiations on the organs. It is known that in case of radiation therapy treatment, the doses are given in fractions over a certain period of time (to prevent major side effects), which may vary from few weeks to months. Thus, before each fraction of radiation dose, computed tomography (CT) scan of the patients is done to determine the exact location of the tumor or cancer cells. So in case the full dose has been divided into 30 fractions, then the patient has to undergo 30 CT scans, each before a fractional therapy. The machine used for the radiation therapy planning is known as the simulator (Cancer Research UK, 2009). The simulator identifies the position of the tumor and marks the position of radiation on the body with the help of light rays. The radiographer uses ink markers on the body before the actual radiotherapy is begun. These linear ink marks are used by the radiographer for positioning the machine for radiotherapy (Cancer Research UK, 2009). Simulators take the pictures (CT scans) in the form of X-rays, which locates the accurate tumor position for the radiographer to carry out the treatment. During a CT scan, it is essential that the person remains completely still so that the measurements are accurate. In order to insure the correct position supports like neck rest, chest board or arm pole are used (Cancer Research UK, 2009). In case of children it is ensured by giving proper sedatives. Sometimes, under critical condition, extra measures are taken in order to prevent essential organs from being radiated during the therapy. These measures include injecting fluids or dyes which mark the position of vital human organs in the CT scan (Cancer Research UK, 2009). These markers may be given orally, through injections or rectally depending upon the requirement. Using this vital information from the CT scans, a treatment plan for radiation therapy is prepared. This plan indicates the position and direction of the radiations during the therapy, so as to minimize the exposure of healthy cells and organs. The scans generated by a CT scanner are in the form of 2 dimensional (2-D) slides, but by the used of digital geometry processing they can be used to generate a 3 dimensional (3-D) images of the body (Nordqvist, 2009). This can be achieved by integrating all the slides (along the same axis) together using a computer system. The CT scan can be understood as a technically advanced format of X-rays machines. The x-rays images are produced by the projection of a broad beam of x-rays on a film after passing through the body (Medindia, 2010). It provides a 2-dimentional projection of the body, where much of the information is lost. In case of CT scan, a thin beam of x-rays is absorbed by the detector after passing though the patients body (Medindia, 2010). Like the x-ray process, the CT scanning is a painless process for the patients but has been known to be accompanied with some side effects. These side effects may vary from the patient to patient depending upon the amount of radiation dose and health of the patient. The detailed discussion on the health effects of CT scanning has been discussed in the later sections of the project. Theory In order to understand the working of a computed tomography (CT) scanner it is essential to understand the properties of ionizing radiations (X-rays) used in the scanning process. The electromagnetic radiations are the arrangement of electric-field and magnetic-field vectors perpendicular to each other and also perpendicular to the propagation direction of the wave (Resnick et al., 2009). These Electromagnetic radiations have penetrating powers, which are directly dependent on the energy (or frequency) of these radiations. So that radiations with higher frequency have higher penetration powers. Therefore, on the basic the energy, the electromagnetic radiations are categorized as Non-ionizing radiations and Ionizing radiations. Non-Ionizing radiations refer to the electromagnetic radiations which have energy lower than that required for an atomic ionization (MIT, 2001). The non-ionizing radiations include radio waves, micro waves, visible light etc. These radiations have lower penetration powers. Alternatively the Ionizing radiations are the high frequency radiations which have enough energy to knockout an electron from an atom and thus causing ionization (MIT, 2001). The Gamma rays and X-rays are the common type of ionizing radiations. Even the alpha particles and beta particles emitted in a nuclear reaction are ionizing radiations (MIT, 2001). Due to the higher energy they have higher penetration power than the non-ionizing radiations. Principle of CT Scanning The most important section of a Computed Tomography (CT) scanning is the interaction of the ionizing X-ray radiations with the living tissues in the body. When the ionizing radiations (X-rays) interact with the living tissues in the body, they break up atoms and molecules from the living tissues and disrupt chemical reactions within the body (Zamanian Hardiman, 2005). The intensity of absorption of the x-ray radiations by the body varies depending upon the tissue coming in interaction. Different body tissues have different absorption power, where some are permeable to x-rays others are impermeable (Medindia, 2010). It is due to this difference in the absorption ability of different sections of the body, which results in the generation of a graded pattern in the scans. High density tissues like the bones appear white in the scan while the soft tissues (like brain and kidneys) appear dark. The cavities (like the lungs) are seen as black sections in the scan (Medindia, 2010). Therefore, this gradation in the pattern can be used as method to distinguish different body organs depending upon their absorption capacity. This forms the basic principle behind the working of an X-ray scanning. Radon (1917) was the first to develop the principles of computed tomography (CT) mathematically (Bushberg et al., 2002). According to Radon, with the help of infinite number of projections through an object, it could be possible to produce an image of an unknown object. In case of film imaging (as in conventional X-rays), a two-dimensional (2-D) projection of the body is generated on the film. Due to this, details in the dimension of the body along the direction parallel to the x-ray beam are lost. In order to overcome this drawback (only up to a certain level) projections can be taken along two directions; posteroanterior (PA) projection and lateral projection (Bushberg et al., 2002) (as shown in Figure 4). Increasing the number of scans improves the amount of information but in critical and complex cases where much more details are required. For these critical cases, CT scan is done. The CT scan provides the tomographical image, which is the picture of patients body in the sections or slabs. The thickness of these uniform slabs may vary from 1 millimeter to 10 millimeter (Bushberg et al., 2002), according to the program, depending upon the requirement. Each CT image consists of an array of large number of pixels forming a two dimensional (2-D) image, which corresponds to the same number of three dimensional thin rectangular slabs called the voxel. The voxels are the volume element whereas the pixels are the picture element (Bushberg et al., 2002). Every ray from the X-ray source passes (transmits) through the patient before the transmission measurement is done by the detector. Intensity of the un-attenuated x-ray radiation emitted by the source is Io whereas the intensity of the attenuated radiation after transmitting through the patient is given as It. The intensities Io and It are related by the equation (Bushberg et al., 2002):   Ã‚  Ã‚  Ã‚  Ã‚  It=Ioe-ÃŽ ¼t   Ã‚  Where;   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚ µ is the total linear attenuation coefficient of the tissue (Smith, n.d.).   Ã‚  Ã‚  Ã‚  Ã‚  t is the distance travelled by the radiation in the tissue i.e. the tissue thickness. The coefficient  µ is dependent on the atomic number and electron density of the tissues (Smith, n.d.). Higher the atomic number and electron density of the tissues, higher would be the attenuation coefficient (Smith, n.d.). This form the basic principle of CT scanning, that different tissues have different level of attenuation properties depending upon their atomic number and electron density. For every measurement, the overall attenuation coefficient is calculated using the above equation. During a complete 360o ­ scan, various transmission measurements for the intensity of X-ray photon are done. Using these intensity measurements specific attenuation values are allotted to every voxel (volume element). These attenuation numbers are directly proportional to the linear attenuation coefficient. The average of these attenuation values is called the CT number (Smith, n.d.). These values can be arranged on a linear scale, the units of which are called the Hounsfield units (HU). The scale for modern CT scanners varies from approximately -1,000 to 3,000 HU. The attenuation scale is based on binary system and therefore the exact values range from -1,024 to +3,071, with a total of 4,096 (or 212) attenuation numbers. Here, the lower represent the black section while the higher values represent the white section of the CT image. On this scale the attenuation value of water is zero HU and that of air is -1,000 HU (Smith, n.d.). Both of these values act as the reference points. Construction of a CT scanner CT scanner is a complex machine, but the basic structure is simple. A common CT scanner has been shown in Figure 2. Two most important parts of a CT scanner are the X-ray source and detector. The source and detector are placed in a circular structure, which has a shape similar to a doughnut. This doughnut shaped circular opening is called the gantry (RadiologyInfo, 2009), with an inner (opening) diameter varying from 60 cms to 70 cms. The X-ray source and detector are placed exactly (diagonally) opposite each other, so that the radiations emitted by the source pass through the body and the transmitted radiations are measured by the detector. The x-ray source and detector system in the gantry is motorized to rotate around the patient for measurements in different projection angles. The rational speed of the system is adjusted according to the detectors ability to measure and convert the x-ray beam into electronic signal. Cobalt (60Co) is generally used as the source of x-rays in the CT scanners. The detector used in CT scanner consists of an array of detectors in a slightly curved shape (like a banana). This curved shape is especially useful in fan-shaped beam projects. Two types of detectors are generally utilized in the CT scans; solid state or scintillation detector and Xenon gas detector (Reddinger, 1997). But the solid state detectors with scintillators like Cadmium Tungstate (CdWO4), yttrium, gadolinium ceramics etc are commonly used (Bushberg et al., 2002). The principle of the scintillation detector is that, when it is struck by a x-ray photon, it produces light. This light signal is then transformed to electrical signal with the help of photodiode. The Depending upon their structure, the detectors are categorized into two categories; single detector array and multiple detector array. Another essential part of a CT scanner is the motorized examination table. The table is controlled to move in and out of the gantry during the scanning process. As the position of the x-ray source and detector is fixed therefore the section being scanned is controlled by the movement of the examination table. For a better scan it is necessary that the patient remains completely still. To insure this table is equipped with neck rest, chest board and arm pole (Cancer Research UK, 2009). The detector measures the intensity of the radiation and converts them into electrical signals. These raw signals are analyzed and manipulated by the computer to convert them into images which can be understood by the radiologists and the technicians. Multiple computers are required in a CT scanner. The main computer that controls the operation of the entire system is called the host computer (Imaginis, n.d.). The computers and controls are located in a room adjoining the scanning room. This prevents the technicians and the radiographer from exposure to x-rays. Scanning Procedure in a CT scanner Initially the patient is positioned on the examination (or scanning) table in a flat upright posture (face towards the roof). In order to insure the correct and stationary position, straps and pillows may be used along the body. Once the patient is correctly positioned on the scanning table, the motorized table moves the patient into the circular opening of the CT scanner (FDA, 2010), which the x-ray radiations are projected on the patient from the scanning. For a particular position of the x-ray source and detector, the rays from the source pass through a region called the projection or view. There are two different types of projection geometries that are used in CT scanning; parallel beam geometry and fan beam geometry. In the parallel beam geometry, the rays projected on the patient are parallel to each other whereas in fan beam geometry, the rays diverge from the source in the shape of a fan (Bushberg et al., 2002) as shown in Figure 7. The fan beam projections are the most commonly in used x-ray projections in the CT scanners. The X-ray tube is attached with a collimator which controls the thickness of the fan beam. This thickness (of the fan beam projection) determines the width of the tissue slide in the scanning process. It is through the collimator that the slice thickness is varied between 1mm to 10mm (Smith, n.d.). The x-ray source and detector rotate around the patient (for imaging) in a circular motion such that they always remain exactly (diametrically) opposite to each other (as shown in Figure 7). During the rotation the source keeps emitting x-rays which are attenuated after passing through the patient. For a single projection (or slice), the x-ray source and detector make a complete 360o rotation around the patient. During the rotation the detector takes a large number of snapshots of the absorbed X-ray beam at different projection angles. A single image may involve approximately 800 rays and there can be up to 1,000 different projection angles (Bushberg et al., 2002). Therefore for a single projection (one slice), the detector does nearly 800,000 transmission measurements (Bushberg et al., 2002). The scanning of a single projection generally takes around 1 sec (for axial CT scanners) (FDA, 2010). Once all the transmission measurements (complete 360o) for a projection (or slice) are completed, the motorized table moves along the axis of the gantry so that the next slice of tissues forms the projection view. The process is continued till the complete required section of the body has been scanned. In the traditional CT scanners, the table moved on to the next projection (slice) only when the scanning of the previous was completed. Such conventional type of scanning is called the axial scanning. But in modern CT scanners, called the helical or spiral CT scanners, the rotation of the x-ray source and detector is accompanied with the uniform movement of the examination table, thus producing a helical projection. The helical CT scanning has been shown in Figure 9. These modern helical CT scanners are much faster than the traditional scanners due to continuous scanning process. They have been reported to take nearly half the time for scanning as compared to the traditional CT scanner s. In order to analyze and study the cardiac structure which is under constant motion, even helical CT is ineffective. For such applications a special CT scanner with an exposure time of 50ms and a maximum exposure rate of 17 images per second are used (Smith, n.d.). These scanners, called the cine CT, freeze the cardiac motion due to extremely low exposure time resulting in a sharp image (Smith, n.d.). These scanners use electron beam to generate x-rays, thus are also known as Electron Beam Computed Tomography (EBCT). In the CT scanning process large volume of data and operations are required to be processed, which is achieved with the help of multiple computers. The detector converts the intensity measurements of the attenuated x-rays in to electrical signals. The main computer, called the hub computer processes these signals and converts them into an image. These images can then be analyzed for radiotherapy planning. Result Computed Tomography (CT) has become an invaluable medical tool. It provides detailed 3-D images of various sections of the body like pelvis, soft tissues, lungs brain, blood vessels and bones (Nordqvist, 2009). Generally, CT scanning is the preferred method of diagnosing different types of cancers like liver, lungs and pancreatic cancers (Nordqvist, 2009). The tomographic images produced by the CT scan provide specific location and size of the tumor along with the details of affected tissues in the proximity of the tumor. This is especially advantageous in planning, guiding, and monitoring therapies like radiotherapy (FDA, 2010). CT scanning has various benefits over other traditional diagnostic techniques; some of the benefits are (RadiologyInfo, 2009): It is non-invasive, painless and extremely accurate. A major advantage is the ability to identify and distinguish bones, soft tissues and blood vessels in the same image. It also provides real time images which cannot be done in conventional X-rays. This technique is fast and simple; and is extensively used to locate internal injuries after accidents. It is less sensitive towards patient movement as compared to MRI. CT scanning can be used on patients with medical implants unlike the MRI. For an effective radiation therapy treatment, it is necessary that only the tumor is irradiated while minimum damage occurs to the surrounding health (normal) body tissues (Badcock, 1982). This is achieved with the help of CT imaging technique. In a study by Badcock (1982), 186 patients with various malignancies were studied and it was found that in nearly 39% of the treatment cases CT scanning was valuable in the assessment of the radiationdose calculation (Badcock, 1982). According to his study, CT scanner resulted in an alternation in target dose by more than 5%, (as compared to the traditional methods) in 27% of the patients (Badcock, 1982). The result has been shown in the table below. The mean alternation was 6.5% of the target dose and usually resulted in reduction of dose per fraction by factors upto 35% (Badcock, 1982). Even with these advantages, the adverse affect of the ionizing x-ray radiations cannot be neglected. Various experiments and researches have consolidated the fact that ionizing radiations like x-rays, gamma rays etc have adverse effect on living tissues. Zamanian Hardiman (2005) have explained that when high energy ionizing radiations interact with living tissues they strip-off atoms and molecules from them. This disrupts the chemical reaction within the body and failure in organ functioning (Zamanian Hardiman, 2005). The adverse effects of ionizing radiations were seen shortly after its discovery in 1890s, with a scientist involved in the study of radioactivity were reported with skin cancer in 1902. But is was not until 1944, that the role of radiations in causing leukemia in human was first documented, mainly in radiologists and physicists (Zamanian Hardiman, 2005). In recent years the use of x-rays has extensviely increased in medical field for diagonostic and treatment application. According to the U.S. Environmental Protection Agency, X-ray deveices are the largest source of man-made radiation exposure (US_EPA, 2007). According to NCRP Report No. 160 (2006), the average annual effective dose per individual in the US population, from all sources has increase from 1.7mSv in 1980s to 6.2mSv in 2006. This increase is mainly attributed to the striking growth of high dose medical imaging procedures that utilize x-rays and radionuclides (NCRP, 2008). Such man-made devices include X-ray machines, CT scans etc. CT scans, especially result in high dose x-ray exposure, with nealy 100 times the exposure dose as compared to standard x-ray equipments (Coach, 2008). Some of the major risks associated with CT scanning are: It is well documented that ionizing radiaitons like x-rays have the ability to cause cancer on exposure. Therefore, the CT dose in radiotherapy increase the probabilty of cancer in the future. Even though only 4% of the total x-ray examinations are CT scans, they account for more than 20% of the radiation dose to the population by medical x-rays (King Saud University, 2004). In general, the effective dose in a CT scan procedure ranges from 2 mSv to 10mSv, which is nearly equivalent to the amount of radiation that a person receive from the background exposures in three to five years (RadiologyInfo, 2009). A CT scan during preganacy make cause serious illness or even birth defects in the unborn baby (FDA, 2010). Children are more sensitive and vulnerable to x-ray exposures than the adults, therefore their CT scanning should be done only under extremely essential and necessary conditions. Women have higher risk of developing cancer in the lifetime, as compared to men under same levels of exposure (FDA, 2009). In some rare situation of high-dose prolonged radiation exposure, the x-rays can cause adverse effects like skin reddening (erythema), skin tissue injury, hair loss, cataracts etc (FDA, 2010). In a study, Sawyer et al (2009) estimated the effective dose resulting from a cone beam CT scanning for planning of radiation therapy using thermoluminescent dosemeters (TLDs) for organ dose and using International Commission on Radiological Protection (ICRP) 60 tissue weighing factor (Sawyer et al., 2009). The results obtained for effective dose from TLD measurements and ICRP 60 weighting factor, for breast, pelvis and head simulation have been shown in the table below. The scanning process results in the exposure of the normal tissues outside the treatment volume (Waddington McKenzie, 2004). It is thus important to analyze the effect that the irradiation caused by the CT scanning process has on the patients body. In a study, Waddington McKenzie (2004) analyzed the propability of developing cancer from the irradiations caused by the extended field portal imaging techniques, the results of which are given in the table below (Waddington McKenzie, 2004). In order to illustrate a real life situation, the calulations in the study were done for an average man with a height of 170 cms and weight of 70 kgs (Waddington McKenzie, 2004). Therefore, these values may change depending upon the height, weight and tumor size of the patient. Discussion Various studies have been done to statistically evaluate the effect of the ionizing radiations on the human health. These risks have severely amplified due to the rapid increase in the number of CT scans for diagnostic applications. CT scans form nearly 5% of all procedures used in diagnostic radiology in the developed countries (Wrixon et al., 2004). In U.S., nearly 70 million CT scans were done in 2007 as compared to just 3 million done in 1980 (Steenhuysen, 2009), this includes more than 4 million children in 2006 (Brenner Hall, 2007). Thus, according to the NCRP Report no. 160, the average radiation dose per person has increased from 3.6 mSv in early 1980s to 6.2 mSv in 2006 (NCRP, 2008). Steenhuysen (2009) has reported that the radiations from CT scans done in 2007 will cause 29,000 cancers and kill nearly 15,000 people in America (Steenhuysen, 2009). These stats explain the level of exposure caused by the CT scans. According to estimates by Amy Berrington de Gonzalez of the National Cancer Institute,

The Peoples Princess Essay examples -- essays research papers

Diana Frances Spencer was born on July 1, 1961 in Sandringham, Norfolk. Her parents, John and Frances Spencer, were hoping for a boy to carry on the Spencer name. It took them nearly a week to come up with a name for the baby girl. Eighteen months earlier, her mother had giver birth to a baby boy, but he was so sick that he only survived for ten hours. Lady Frances, twenty three at the time, was sent to many specialists to find out the reason why she could not have a little boy. Three years after Diana was born, Lady Frances gave birth to a healthy baby boy, Charles. Diana had been christened in Sandringham Church with well-to-do commoners for godparents. Charles, on the other hand, was christened in Westminster Abbey with the Queen of England as his godparent. As a child, Diana spent most of her time playing outside. Close to her home were many woods, horse stables, and they owned a heated swimming pool. The woods were filled with rabbits, foxes, deer, and other animals. As she grew older, she also grew a great love for animals. She also had a love for children. At age eighteen, she became a teachers assistant. She taught dance, drawing, and painting to kindergarten students. When she was six years old, her mother left her father for another man. She went between her mother's townhouse and her father's country estates. Both parents got re-married, so she had two step-parents to please. Because of Diana's royal background, she earned an invitation to Prince Charles's thirtieth birthday party. This is were the two met for the first time. There were hundreds of people at the party, but Charles couldn't take his eyes off of Diana. A few months later, the two became a couple. "The news about Charles and Diana's love soon spread. The shy young teacher's aide quickly became famous. Everyone wanted to know if the Prince had finally found his Princess. "The answer came in February 1981. Prince Charles asked Lady Diana to be his wife. Blushing with happiness, Diana accepted. The fairy tale had begun-and Diana's life would never be the same."1 During their engagement, Diana frequently visited Buckingham Palace, and the Queen of England for roya... ...imply immersed by duty and tradition but can sing openly as you planned. We fully respect the heritage into which they have both been born, and will always respect and encourage them in their royal role. But we, like you, recognize the need for them to experience as many different aspects of life as possible, to arm them spiritually and emotionally for the years ahead. I know you would have expected nothing less from us. William and Harry, we all care desperately for you today. We are all chewed up with sadness at the loss of a woman who wasn't even our mother. How great your suffering is we cannot even imagine. I would like to end by thanking God for the small mercies he has shown us at this dreadful time; for taking Diana at her most beautiful and radiant and when she had so much joy in her private life. Above all, we give thanks for the life of a woman I am so proud to be able to call my sister: the unique, the complex, the extraordinary and irreplaceable Diana, whose beauty, both internal and external, will never be extinguished from our minds."

Reaction Paper on African Short Stories

Reaction Paper 3: South Africa is one on the most controversial countries in the world. It is located in the southern part, at the bottom of the continent of Africa as its name indicates. The country is known to shelter a diversity of languages and cultures. The country went through many violent events opposing the white minority dominating over all other races. Fortunately, a man named Nelson Mandela will change the course of history and impact Africa and the world in a great way.The role of this paper will be to reflect on the socio cultural and economic conditions of folks in South Africa by establishing the thread they all seem to have in common, to elaborate on the context that makes these conditions possible and in the end, we will try to suggest some solutions to these problems. In our study of the South Africans folks, we will use three important stories related to South Africa. These stories can be found in the book African Short Stories, edited by Chinua Achebe. Chinua Ache be is regarded as one of the most influential writers in African literature and all over the world.His trilogy of books about Nigeria and Africa are read all over the world and translated in many languages. He put together a number of stories related to Africa in a little book. These stories for the most part are talking about issues in life and particularly in Africa. The stories that we will use here are therefore related to South Africa. Theses stories are the bridegroom written by Nadine Gordimer, the coffee cart girl written by Ezekiel Mphalele and reflections in a cell put together by Mafika Gwala. All these stories are all reflecting one common thing, the conditions of life of black people in South Africa.The stories generally reflect the effects that apartheid had on the population of South Africa. It is important to clarify what the word apartheid refers to. Apartheid was a system in which racial segregation was the cornerstone and was encouraged and established by the nati onal government. It is important to note that a minority of white people formed the government and that the people that were racially segregated were people of other â€Å"color†, especially the Africans. In the stories presented in the book and on which we are reflecting, you can clearly see that black men and women are struggling.The neighborhood in which they live are extremely poor, the way they speak English is alarming, and the most important part is that the authors always made sure to display the apparent domination of the white people over the black people. Apartheid was the result of colonization. The minority constituted by white people had control over everything and was abusing that power to serve and maintain its selfish interest. As a result, all other racial groups were forced to live to serve the master, going through unimaginable suffering and pain.Apartheid was based on four main ideas: firstly, the population was structured in different groups according to their color. Secondly, only the white race was regarded as the civilized race. Thirdly, white interests should prevent before anybody’s interest. Finally, the white people formed a single nation along with the Afrikaans, formula that made them the largest racial group in the country. Apartheid was maintained by a series of repressive laws that were only made possible by the population Registration Act of 1950. That Registration was considered as the bible of apartheid.IT contained a classification of every person and based on that classification, the best interests of the â€Å"dominating minority† could be best served. People from African decent had their citizenship removed and all kinds of atrocities were committed. The white minority made sure that black people stayed non-educated because they knew that education was the road to emancipation. Luckily, one of the most popular world’s leaders, Nelson Mandela, succeeded in restoring black people rights just li ke Martin Luther king did with the black population here in the United States.Nelson Mandela, just like Martin Luther King applied a policy of non-violence to bring the apartheid system down. Some possible solutions to racial problems could be the adoption of non-violence doctrine like Gandhi and also education. Education can even be considered as the most important factor because leaders need to have an open spirit to be able to direct the masses. Another solution could be the use of religion to strengthen the mind. Religion can be essential and has always been essential in the black community. It brings peace of mind and strength in the war for justice and equality.

Microsoft Office Word, Excel, and Powerpoint in the Business Enviornment.

In most work environments, Microsoft Office Word, Excel, and PowerPoint are being used on a daily basis. From being a Loan officer to a front desk cashier these three apps are very helpful in our work place. Microsoft Word is good with writing business letters and business cards, Excel is good with making spreadsheets or charts for your business, and lastly, PowerPoint is good with making presentation audio and visually. In the following paragraphs below I will explain why these three are most helpful and useful in the work place. For one, Microsoft Office Word is mostly used to writing business letters to their clients. From one paragraph or 4 pages it’s where they will have their letter written up and printed. There are also different tools like spell check and grammar, formatting tab, paragraph selection and etc. that also become useful. Business cards can also be used on Microsoft Word and then printed out which also is being used in the work place environment. (office Microsoft) Secondly, Microsoft Excel is mostly used because of its layout and widespread availability, it is often used as a tool to create and maintain a list. More users use it to store database records, create charts or graphs. A lot of organization uses excel to manage their budgets, business planning, customers records, business intelligence, analysis of sales data, customer data, performance dashboard, etc. (advanced excel) Lastly, Microsoft PowerPoint presentations utilize both audio and visual techniques, making for easier understanding. Normal teaching and training is interactive and more effective by using PowerPoint presentations instead of simple lectures. Many executives and managers use PowerPoint for this reason. Executives use this as a strategy to increase sales. Using PowerPoint in front of a potential client shows that you are up with the time. Plus, projecting charts that all can see also makes the presentation more interactive for the client. (powerpoints and apps) So all in all I hope you find Microsoft Word, Excel, and PowerPoint useful in the work place. Not only will it help you and your business be successful but also have that professionalism. ? Reference Microsoft office np November 1, 2011< http://www. baycongroup. com/powerpoint> Baptiste, Jason np November 1, 2011 < http://jasonlbaptiste. com/startups/microsoft-excel>

Ethan Frome †Book

Ethan Frome – Book Free Online Research Papers Form I I. The main character in the book Ethan Frome is Ethan. He is very sensitive for others and is weighed down from living in Starkfield for so long. Ethan has many different personality traits that are seen with the course of the book. Some of these traits that Ethan expresses are his abilities to help others at his own expense, how hard he works to achieve his goals, and also that he is responsible. Another trait, that some may say is negative, is that Ethan does not stand up for himself, and inconveniences himself for other people, whether it means taking away somebody Ethan loves. The reason Ethan asks Zenobia to marry him is because he needs someone to take care for him since his parents are dead. II. Zenobia is a sickly person who likes to focus on the treatment of her â€Å"sickness† rather on others. She is self-centered and likes to be the center of attention. She holds the position of authority in the Frome household and likes to take advantage of it. Ethan and Zenobia meet while she is taking care of his sick parents. III. Mattie Silver is Zeena’s loyal cousin who is fully capable of helping Ethan and Zeena. She is really beautiful, young, and energetic. Mattie is a hardworking, down-to-earth kind of girl. Mattie’s relationship with Ethan seems to be a lasting one. They both strong feelings for each other and have many similarities. Although Ethan has this Beat-up, careless look, and Mattie is extremely beautiful they are a perfect match for each other and really care for one another. IV. Mattie and Ethan come to be able to spend the night together because Zeena has left town to see her doctor. This leaves the couple alone in the kitchen for the night. This is the first time they are alone together and they get to share their past lives with each other and get to show their feelings. They are sitting near the fire and Mattie is knitting while they talk. Ethan wants to kiss her but is afraid so he kisses her scarf that she is knitting. They are falling in love. V. Ethan and Mattie Decide that they want to die together so they plan to commit suicide by running their sled into the big elm tree. The two pile onto the sled together, with Ethan sitting in front, and Ethan sets the sled into its fatal motion. As they hurtle down the hill, Ethan feels confident that they will hit the tree, but at the last moment he swerves unexpectedly, as he seems to see Zeena’s face before him. The sled glides off in a second of uncertainty before he rights it on its course again. They then hit the elm. Both of them survive. They are both hurt badly and Zeena has to take care of them. Form II I. There were many themes found in Ethan Frome, but the greatest of them all is loneliness and isolation. In college Ethan acquired the nickname Old Stiff because he rarely went out with the boys. Once he returned to the farm to care for his parents, he couldnt go out with them even if he wanted to. Whatever hes done has kept him apart from others: tending to the farm and mill, nursing his sick mother and caring for Zeena. Ethans isolation is intensified, because he is often tongue-tied. He would like to make contact with others but cant. For example, when he wants to impress Mattie with beautiful words of love, he mutters, Come along. II. Mattie and Zeena are true opposites. When Mattie first got off of the train she was shown as very depressed and pale. But as weeks pass she gets out of her depression and very quickly becomes a vibrant young woman who shone with natural beauty, something Zeena never had. She was able to win the heart of many young men in a heartbeat. Mattie was everything Zeena wasn’t and she too was able to captivate the heart of Ethan. Mattie was truly in love with Ethan while Zeena only married Ethan out of lust and not for love. Zeena did not love Ethan while Mattie and Ethan were beyond doubt in love. III. Ethan Frome’s house is wearing away from the many winters it has faced. Like Ethan, they are both bent badly out of shape and need care. Both Ethan and the house represent that many things have come and gone over them, most of which were failures. Both the house and Ethan were shaped by the harsh winters and the many people who lived in the house. IV. The Frome graveyard represents Ethan’s eternal bond with Zeena. He hates Zeena and doesn’t want to have to spend all eternity lying next to her. This is why he fears the graveyard. The graveyard also represents how the rest of his family was not able to get out of bleak old Starkfield. He wants to lay there for ever with Mattie. V. The Elm tree symbolizes the end and the escape of two lives. It also symbolizes strength and courage. After the crash, the Elm tree was still standing, while Ethan and Mattie were terribly injured. If Ethan was a stronger person he would not have crashed into the tree with Mattie. He would have had the strength to say â€Å"no† in the first place. Zeena who was once a hypochondriac, recovered, and now she has to take care of Mattie and Ethan. â€Å"It was a miracle, considering how sick she was-but she seemed to be raised right up just when the call came to her.† (p,131) Research Papers on Ethan Frome - BookHarry Potter and the Deathly Hallows EssayBook Review on The Autobiography of Malcolm XPersonal Experience with Teen PregnancyArguments for Physician-Assisted Suicide (PAS)Capital PunishmentEffects of Television Violence on ChildrenHip-Hop is ArtHonest Iagos Truth through Deception19 Century Society: A Deeply Divided EraThe Hockey Game

Banning Corporal Punishment in Schools

Banning Corporal Punishment in Schools What is corporal punishment? The National Association of School Nurses defines it as â€Å"the intentional infliction of physical pain as a method of changing behavior. It may include methods such as hitting, slapping, punching, kicking, pinching, shaking, use of various objects (paddles, belts, sticks, or others), or painful body postures. Still Legal in 22  States While corporal punishment such as paddling, spanking and hitting students disappeared from private schools by the 1960s, according to an article published by NPR in December 2016,  it is still permitted in public schools in 22  states, which can be broken down into 7 states that simply dont prohibit it and 15 states that expressly permit it. The following seven states still have laws on their books that do not prohibit corporal punishment: IdahoColoradoSouth DakotaKansasIndianaNew HampshireMaine The following 15 states expressly permit corporal punishment in schools: AlabamaArizonaArkansas  FloridaGeorgiaKentuckyLouisianaMississippiMissouriNorth CarolinaOklahomaSouth CarolinaTennesseeTexasWyoming What is ironic about this situation is that no accredited teachers college in the U.S. advocates the use of corporal punishment. If they dont teach the use of corporal punishment in the classroom, why is the use of it still legal? The United States is the only nation in the western world which still permits corporal punishment in its schools. Canada banned corporal punishment in 2004. No European country permits corporal punishment. So far, the United States Congress has not acted on requests from organizations such as Human Rights Watch and the American Civil Liberties Union to enact federal legislation banning corporal punishment. Since education is widely viewed as a local and state matter, any further banning of corporal punishment will probably have to occur at that level. If, on the other hand, the federal government were to withhold funding from states where corporal punishment is legal, the local authorities might be more inclined to pass the appropriate laws. Rationale for Corporal Punishment Corporal punishment in one form or another has been around schools for centuries. It certainly is not a new issue. In the Roman Family children learned by imitation and corporal punishment. Religion also plays a role in the history of disciplining children by spanking or hitting them. Many people interpret Proverbs 13:24 literally when it states: Spare the rod and spoil the child. Why Should Corporal Punishment Be Banned? Research has shown that corporal punishment in the classroom is not an effective practice, and can cause more harm than good. Research has also shown that more students of color and students with disabilities experience instances of corporal punishment more than their peers. The research shows that children who are beaten and abused are more likely to be prone to depression, low self-esteem and suicide. The simple fact that corporal punishment as a disciplinary measure is not part of any education curriculum indicates that educators at every level know that it has no place in the classroom. Discipline can and should be taught be example and non-physical consequences. Most leading professional associations oppose corporal punishment in all its forms.  Corporal punishment is not allowed in the military, mental institutions or prisons, either. I learned years ago about corporal punishment from a man who was an expert in the field. I co-founded a high school in Nassau, Bahamas in 1994. As deputy director of the school, one of the first issues I had to deal with was discipline. Dr. Elliston Rahming, the owner and director of the school, was a criminologist. He had very firm views about the subject: there would be no corporal punishment of any kind. We had to find better, more effective ways than beating to enforce discipline. In the Bahamas, beating children was, and still, is an accepted disciplinary method in the home and in the school. Our solution was to develop a Code of Discipline which basically penalized unacceptable behavior according to the severity of the infraction. Everything from dress code to drugs, weapons and sexual infractions was covered. Remediation and resolution, retraining and reprogramming were the goals. Yes, we did get to the point on two or three occasions where we actually did suspend and expel st udents. The biggest problem we faced was breaking the cycle of abuse. What Happens in Americas Private Schools? Most private schools frown on the use of corporal punishment. Most schools have found more enlightened and effective methods for dealing with disciplinary issues. Honor codes and clearly spelled out results for infractions combined with contract law give private schools an edge in dealing with discipline. Basically, if you do something seriously wrong, you will get suspended or expelled from school. You will have no recourse because you have no legal rights other than those in the contract which you signed with the school. Things Parents Can Do What can you do? Write the state education departments of the states which still permit corporal punishment. Let them know that you oppose its use. Write your legislators and urge them to make corporal punishment illegal. Blog about local incidents of corporal punishment whenever appropriate. Organizations Opposed to Corporal Punishment in Schools The American Academy of Child and Adolescent Psychiatry opposes the use of corporal punishment in schools and takes issue with laws in some states legalizing such corporal punishment and protecting adults who use it from prosecution for child abuse. The American School Counselor Association: ASCA seeks the elimination of corporal punishment in schools. The American Academy of Pediatrics recommends that corporal punishment in schools be abolished in all states by law and that alternative forms of student behavior management be used. The National Association of Secondary School Principals believes that the practice of corporal punishment in schools should be abolished and that principals should utilize alternative forms of discipline. The National Center for the Study of Corporal Punishment and Alternatives (NCSCPA) tracks information about this subject and puts out updates. It also offers an interesting reading list and other materials. Interview With Jordan Riak Jordan Riak is the Executive Director of Project NoSpank, an organization which is dedicated to the eradication of corporal punishment in our schools. In this article, he responds to some of our questions regarding corporal punishment. How Prevalent is Corporal Punishment in Schools? With the exception of those who are directly affected, most people are unaware that in more than 20  states, teachers and school administrators have the legal right to physically batter pupils. Children are sent home with bruised buttocks daily in untold numbers. There is a downward trend in the number of paddlings annually, which is encouraging, but still a small comfort to victims. Editors note: outdated data has been removed, but recent studies have shown that more than 100,000 students were physically punished in 2013-2014.  But the true numbers are surely higher than the records show. Since the data is supplied voluntarily, and since those reporting arent especially proud of what they are admitting to, under-reporting is inevitable. Some schools decline to participate in the Office for Civil Rights survey. When I inform people of the extensive use of corporal punishment in the schools, they almost invariably react with astonishment. Those who remember the paddle from their own school days tend to assume (erroneously) that its use had long since faded into history. Those who are fortunate enough to have attended schools where corporal punishment wasnt used or who lived in the states where bans were in effect are incredulous when presented with information about its current use. The following anecdote is illustrative. I was invited to address a class of students at San Francisco State University who were preparing to become school counselors. Some in the group already had teaching experience. At the conclusion of my presentation, one of the students- a teacher- opined that surely I was misinformed about the situation in California. Corporal punishment just isnt allowed here and hasnt been for years, she flatly insisted. I knew otherwise. I asked her where she had attended school and in w hich districts she had worked. As I expected, the places she named all had district-wide policies against the use of corporal punishment. She was unaware that in neighboring communities students were being paddled legally. Paddlers dont advertise, and one cant blame her for not knowing. The use of corporal punishment by public school teachers in California became illegal on January 1, 1987. In the United States, there is a long-standing gentlemans agreement between government, the media, and the educational establishment to avoid any mention of teacher violence. Typical of such taboos, adherents not only refrain from entering forbidden territory but come to believe that no such territory exists. An indignant correspondent wrote me the following: In my twenty years as a teacher in Texas, I never saw one student paddled. Strictly speaking, he might have been telling the truth about what he hadnt seen, but its hard to believe he was unaware of what was going on all around him. Recently I heard this on the radio. An author who had written about sports heroes influence as role models on youth was just concluding an interview and was beginning to field listeners calls. One caller recounted his experience at high school where a coach routinely beat up players. He told how one student who had been victimized by the coach later encountered him in public and punched him. The show s host abruptly cut off the call, and said laughingly, Well, there you have the darker side. Sounds like a movie by____ and hastened to the next caller. Rest assured, the United States does not have a monopoly on denial in this regard. At a conference on child abuse in Sydney in 1978, when I raised a question from the floor about why none of the presenters had talked about caning in schools, the moderator replied, It seems the things you want to talk about, Mr. Riak, are not the things we want to talk about. At that same conference, where I had set up a table to distribute anti-corporal punishment literature, a member of the New South Wales education department told me this: The corporal punishment controversy that youve been stirring up here is causing more broken friendships in the department than any other issue I can remember. Caning is no longer legal in Australian schools, and hopefully, old friendships have mended. How Do You Define Corporal Punishment? There never has been, and probably never will be, a definition of corporal punishment that doesnt stir debate. The American College Dictionary, 1953 Edition, defines corporal punishment as physical injury inflicted on the body of one convicted of a crime, and including the death penalty, flogging, sentence to a term of years, etc. The California Education Code, 1990 Compact Edition, Section 49001 defines it as the willful infliction, or willfully causing the infliction of physical pain on a pupil. Proponents of corporal punishment typically define the practice in personal terms, i.e., what they experienced when they were children, and what they now do to their children. Query any spanker on what it means to corporally punish a child and you will hear autobiography. When one attempts to distinguishing corporal punishment from child abuse, the confusion deepens. Lawmakers, as a rule, duck this conundrum. When it is forced on them, they act as though they are walking on eggs as they grope for language doesnt cramp the style of child punishers. Thats why legal definitions of child abuse are models of vagueness- an heroic accomplishment for those trained in the art of exactitude- and a boon to lawyers who defend abusers. School corporal punishment in schools United States typically involves requiring the student to bend forward as far as possible thus making the protruding posterior a convenient target for the punisher. That target is then struck one or more times with a flat board called a paddle. This causes sharp upward jolts to the spinal column accompanied by bruising, soreness and discoloration of the buttocks. Since the locus of impact is close to the anus and genitals, the sexual component of the act is unarguable. Nevertheless, possible adverse effects on the developing sexuality of young victims are ignored. Furthermore, the possibility that certain punishers are using the act as a pretext for gratifying their own perverse sexual appetites is also ignored. When these risk factors are cited, corporal punishment apologists typically dismiss the suggestion with derisive laughter and retorts such as, Oh, comon, please! Gime a break! Forced exercise is one of several unacknowledged forms of corporal punishment. Though the practice is unequivocally condemned by physical education experts, it is widely used, even in states that ban corporal punishment. It is a staple of locked facilities where troubled youth are corralled ostensibly for the purpose of being reformed. Not allowing children to void bodily waste when the need arises is another form of corporal punishment. It is physically and psychologically dangerous in the extreme, but its use against schoolchildren of all ages is ubiquitous. Punitive restriction of movement also qualifies as corporal punishment. When done to incarcerated adults, it is deemed a violation of human rights. When done to schoolchildren, its called discipline. In school environments where buttocks beating is key to student management and discipline, all the myriad lesser insults to which children are prey such as ear twisting, cheek squeezing, finger jabbing, arm grabbing, slamming against the wall and general manhandling are apt to pass unchronicled and unrecognized for what they really are. Article updated by Stacy Jagodowski

A COUNTRY BOY CAN SURVIVE

When asked What is constituting a redneck? Various answers are wonderful. The people of the country are regarded as drunk, racist, useless people, even Monticello. I lived in Monticello for 16 years, most of them are in rural areas, but not all. As it is certainly the atmosphere we are looking for, we chose Monticello to do research. To become a country man here, you must have some qualities like a big track like a rebellious flag, and you have to wear the right way. I grew up in a world I rarely experience. This is the unpaved road and track pickup world. When I sang a route from Northern California to South Alabama during the country boy where Hank Williams Jr. could survive, he was really singing my northern California. 4 hours, FFA, Bath Splash Party, High School Soccer. It is free. The period before the phone. Curfew is the only true limit. As long as we get home somewhere at midnight, we can solve any troubles we want. We are Cinderella, a rural man who went home from the backi ng ball. One day, a young couple named Maltese and John found a boy sleeping in the old chair of the front porch. His arrival is as marvelous as possible. I have never heard that everyone goes to a small farm walking on an unpaved road. There is only one clue. There was a handwritten note in my pocket. But as the days and weeks expanded, Marta and John have not said a word yet, but I liked Jelly Beans and found out that I liked it on any surface. I'm very happy to play with drums, my dogs, Beagle dogs, family cows. Most importantly, he is a very enthusiastic and proficient artist who creates not only capricious and fantasy scenes, but also landscapes full of blue trees, red roads and purple animals. Is this probably a clue to his hometown? You can ask this question nationwide, but I ask this boy everyday. Who is the villain in the country where killers in neighboring countries can walk freely? Who survives the corn meal that was excluded after the family villain and the boys were ap proved by his parents? Who is the villain when your escaped citizen causes conflict in neighboring countries? Maybe we are asking the wrong question. In order to enjoy this benefit, you have to look at past negative factors. These are the issues covered in William Golding's novel The Lord of the Flies. The story is a story of a group of young boys who were forced to learn how to survive on an island surviving in an airplane accident. Through the story, the boys change each other, open each other, and eventually they will fight between them. The Lord's Lord casts doubts about the effects of innocence, civilization, and power. Ralf immediately began leading the boys. These boys can light a fire, but Jack encourages them to concentrate on hunting rather than fire. Fire is out of control. The little boy disappeared and was presumed to have died.