Why does PET imaging only detect coincidence gamma rays and reject all non-coincidence gamma rays?

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Ans) Positron Emission Tomography (PET):

- Involves the detection of annihilation gamma photons from a positron emitting radionuclide.

Principle of PET

- Detecting gamma rays and building a three-dimensional picture.

Annihilation coincidence detection (ACD):

As it is unique to PET, two detection events take place at nearly the same time, assumed to have resulted from a single annihilation even along a line connecting the two detectors, meaning the decay event is localized without the need for a collimator.

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Why does PET imaging only detect coincidence gamma rays and reject all non-coincidence gamma rays?

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