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What does PET stand for? Whereis it used? |
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Answer» Solution :PET stands for Postitron EMISSION Tomography. PET scans are used in examining the brain. A patient is given a does of FDG (fluoro-deoxy-glucose)which has a flurino-18 atom attached to a moleculeof gucose. The flurine atom decays with emission of positron and neutrino with a half life of 110 minutes.`._(9)F^(18) to ._(8)O^(18)+._(-1)e^(0)+V_(e)` The positron encounters an electron and the two annhilate to produce two powerful `gamma`-ray photons, i.e., `e^(+)+e^(-)to 2gamma` The two photons so produced move in opposite directions and are DETECTEDBY specialized detectors, which determine their point of origin inthe pateint's body. Thus the area in the patients body, where glucose metabolism is most intese is DETECTED. Thus PET ISA diagonistic technique for the brain, which is BASED on radioactive decay. |
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