Attenuation in PET

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A

B

Case 1 - annihilation near A:The photon going towards detector A has less material to go through, but the one going to B has more.

Case 2 - annihilation near B:The photon going towards detector A has more material to go through, but the one going to B has less.

Net result - total attenuation for COINCIDENCE events (both photons needed) does not change, ANYWHERE in the line of response.

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