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. 2016 May 23;3:8. doi: 10.1186/s40658-016-0144-5

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© Conti and Eriksson. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Three mechanisms associated with prompt gamma spurious coincidences: a ¹²⁴I has a prompt gamma of energy within or close to the PET energy window (603 keV); b ⁶⁸Ga has a prompt gamma of energy that can enter the PET energy window if it undergoes Compton scatter (1077 keV); and c ⁷⁶Br has several high-energy gammas that can reach the detectors and generate e ⁺/e ⁻ pairs