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(C) $PET$ stands for Positron Emission Tomography.It is a nuclear medicine functional imaging technique.It uses a radioactive tracer that emits positr

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Positively charged electrons

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(C) $PET$ stands for Positron Emission Tomography.It is a nuclear medicine functional imaging technique.It uses a radioactive tracer that emits positrons,which are the antiparticles of electrons (positively charged electrons).When these positrons encounter electrons in the body,they annihilate,producing gamma rays that are detected by the scanner to create images of metabolic activity.

$PET$ is a diagnostic technique based on

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