The main difference between nuclear medicine diagnostic tests and other imaging modalities is that nuclear imaging techniques show the physiological function of the tissue or organ being . In developed countries 26 of world population the frequency of diagnostic nuclear medicine is 19 per year and the frequency of therapy with radioisotopes is about one tenth of this in the usa there are over 20 million nuclear medicine procedures per year and in europe about 10 million. Nuclear medicine imaging non invasively provides functional information at the molecular and cellular level that contributes to the determination of health status by measuring the uptake and turnover of target specific radiotracers in tissue these functional processes include tissue blood flow and metabolism protein protein interactions expression of cell receptors in normal and abnormal . The diagnostic techniques that play vital roles in nuclear medicine imaging are scintigraphy a two dimensional imaging process is a diagnostic technique in nuclear medicine taken internally the radiotracer emits gamma radiation that is captured by external detectors known as gamma cameras to form two dimensional images for medical
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