Nuclear Medicine Examples

PET Scan

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PET Scan

An interesting application in nuclear medicine is the use of positron annihilation in positron emission tomography or PET. Certain radioisotopes decay by positron emission, and such radioisotopes can be used as tracers. If injected into the body, they can be readily followed because the emission of the annihilation pairs of coincident gamma rays at 180 allows their source to be located along a line. Data collection for emissions at several angles permits precise location of any concentration of the radioisotope. An image of a slice of the body (called a tomograph) can be constructed by using a ring of detectors.

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