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(B) $P.E.T.$ stands for Positron Emission Tomography.It is a nuclear medicine functional imaging technique used to observe metabolic processes in the

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positron emission

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(B) $P.E.T.$ stands for Positron Emission Tomography.It is a nuclear medicine functional imaging technique used to observe metabolic processes in the body for the diagnosis of diseases.In this technique,a radioactive tracer (such as $F^{18}$) is injected into the patient,which undergoes positron emission.The emitted positron annihilates with an electron in the body,producing gamma rays that are detected by the scanner to create images.Therefore,the method is based on positron emission.

The modern treatment method $P.E.T.$ is based on:

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