What is the energy of photons produced by positron-electron annihilation in PET?

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Multiple Choice

What is the energy of photons produced by positron-electron annihilation in PET?

Explanation:
In positron-electron annihilation, the rest-mass energy of the electron (and positron) is converted into two gamma photons. Each photon carries about 511 keV of energy, and they are emitted in nearly opposite directions to conserve momentum. The total energy released is about 1.022 MeV, but in PET, each detected photon is ~511 keV.

In positron-electron annihilation, the rest-mass energy of the electron (and positron) is converted into two gamma photons. Each photon carries about 511 keV of energy, and they are emitted in nearly opposite directions to conserve momentum. The total energy released is about 1.022 MeV, but in PET, each detected photon is ~511 keV.

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