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Schematic representation of (A) single photon emission computed tomography (SPECT) and (B) positron emission tomography (PET). The gamma camera depicted in A intrinsically produces a planar projection but by rotating the camera around the subject a three-dimensional tomographic reconstruction (SPECT scan) is produced. Adapted with permission from Man et al., ref (26). Copyright 2019 Man et al. Published by Elsevier under CC License [https://creativecommons.org/licenses/by/4.0/].
