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What does the ‘P’ in PET stand for?

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What does the ‘P’ in PET stand for?

(a) Positron

(b) Photon

(c) Proton

(d) P – orbital

This question was posed to me during an online interview.

Origin of the question is PET & SPECT topic in chapter Diagnostic Investigation via Imaging Techniques of Clinical Science

1 Answer

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Best answer
Correct choice is (a) Positron

Best explanation: PET stands for Positron Emission Tomography. In a PET process, there is a nuclear reaction causing emission of a positron. This positron comes in contact with an electron, undergoes annihilation and gives out two gamma rays which are detected by the detector. On the gamma rays that are detected at the opposite ends are used to form an image. Rest are discarded as noise.

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