The radiation dose reported in the gray or mGy unit is proportional to the amount of energy that the irradiated body part is expected to absorb, and the physical effect (such as DNA double strand breaks) on the cells' chemical bonds by X-ray radiation is proportional to that energy. Definition of Computed Tomography in the Definitions.net dictionary. CT scanning can perform a virtual colonoscopy with greater accuracy and less discomfort for the patient than a traditional colonoscopy. A computerized tomography scan (CT or CAT scan) uses computers and rotating X-ray machines to create cross-sectional images of the body. [72] Hence, the left side of the image is to the patient's right and vice versa, while anterior in the image also is the patient's anterior and vice versa. deterministic effects (harmful tissue reactions) due in large part to the killing/ malfunction of cells following high doses; and. However, increased dosage raises the adverse side effects, including the risk of radiation-induced cancer – a four-phase abdominal CT gives the same radiation dose as 300 chest X-rays (See the Scan dose section). Bone is the most dense and measures +1000. An ultrasound scan may also help doctors see into the urinary tract to diagnose urosepsis. [76], For purposes of comparison, the world average dose rate from naturally occurring sources of background radiation is 2.4 mSv per year, equal for practical purposes in this application to 2.4 mGy per year. CT scan results are considered normal if the radiologist didn’t see any tumors, blood clots, fractures, or other abnormalities in the images. A SPECT scan is a type of nuclear imaging test, which means it uses a radioactive substance and a special camera to create 3-D pictures. [72] Hence, the left side of the image is to the patient's right and vice versa, while anterior in the image also is the patient's anterior and vice versa. CT, or computerized axial tomography (CAT) scans, are medical imaging tests that are used to take pictures of parts of the body at different angles to create detailed images of internal … It is commonly used to investigate acute abdominal pain. "[50] On the other hand, a recent paper analyzing the data of patients who received high cumulative doses showed a high degree of appropriate use. [61] In the United Kingdom it accounts for 15% of radiation exposure. 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