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| CT can be used well in detecting anatomical changes and organs that are sensitive to breathing and intestine movement. The amount of radiation can be minimized to 1/6 of conventional CT with prompt and specific results. Internationally, it is widely used in lung cancer diagnosis. Brain, kidneys, and pancreas are hard to be imaged by conventional X-ray. Therefore, X-ray and computer are incorporated to view such organs. Initially, it was invented to detect diseases in the skull region. Today’s CT can scan the whole body. |
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| Any foreign material is removed from the patient’s body. Contrast may be injected and in this case, precautions and side effects should be well explained. |
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Acute hemorrhage and skull fracture |
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lung cancer and lung infection, chronic air
way disease |
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oncology in cancer diagnosis such as liver
cancer, gynecologic oncology, pancreas cancer, biliary cancer |
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staging of stomach cancer for treatment |
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kidney disease, adrenal disorders |
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It can only provide planar imaging |
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Use of X-ray may be harmful
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The use of contrast may cause side effects. |
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intracerebral lesion (old hemorrhage) |
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joint region (hip joint, shoulder joint, elbow
joint, knee joint etc)
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neck and pelvic region
(herniation of intervertebral disc etc) |
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nervous disease or muscular disorders |
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Disadvantages: High price |
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Patients with metallic insertion cannot have the procedures
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Patients with a cardiac pacemaker cannot have the procedure. |
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| CT images targeted organs from different directions by emitting x-rays through a patient body and collecting the information of x-ray absorption difference within the organ. The information is reformatted by computer using mathematical algorithms. Compared with the conventional x-ray, the resolution and contrast are far better in imaging blood, CSF, white matter, grey matter, tumor differentiation. CT holds an important value in diagnostic imaging due to the ability in detecting the difference of x-ray absorption to a fine degree. The basic mechanism is that x-ray tube spirals around a part of patient’s body (organ) emitting and detecting the x-ray. The data is then collected and reformatted by computer according to the difference in the absorption calculation. The calculated information is reformatted as a picture and put out on a monitor. |
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