Brief History of X-Ray Discovered in 1895 by Wilhelm Konrad RoentgenElectromagnetic waveTravels 186,000 miles/secShort wavelengthPenetrates solid objectsReacts with photographic film
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Computed tomography Computed tomography (CT scanning) is a
medical imaging modality where tomographic images or slices of
specific areas of the body are obtained from a large series of two-dimensional X-ray images taken in different directions. These cross-sectional images can be combined into a three-dimensional image of the inside of the body and used for diagnostic and therapeutic purposes in various medical disciplines.
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Radiograph Bones contain much calcium , which due to
its relatively high atomic number absorbs x-rays efficiently. This
reduces the amount of X-rays reaching the detector in the shadow of the bones, making them clearly visible on the radiograph.
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Adverse effects Diagnostic X-rays (primarily from CT scans due
to the large dose used) increase the risk of
developmental problems and cancer in those exposed. X rays are classified as carcinogenic ones.
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Radiation Safety and Dose Reducing patient exposure -Advances in technology -Assessment
of benefit-to-risk ratio -Prevent serious damage from radiation by limiting