(A) Single photon emission computed tomography (SPECT) image of the brain. (Reprinted from Vigren P et al.11 Copyright 2014 licensed by Creative Commons.

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(A) Single photon emission computed tomography (SPECT) image of the brain. (Reprinted from Vigren P et al.11 Copyright 2014 licensed by Creative Commons Attribution License [CC BY].) (B) Positron emission tomography (PET) image of the brain. (Image credited to Jens Maus, Wikimedia Commons [http://en.wikipedia.org/wiki/Image:PET-image.jpg] and released into the public domain.)‏ (A) Single photon emission computed tomography (SPECT) image of the brain. (Reprinted from Vigren P et al.11 Copyright 2014 licensed by Creative Commons Attribution License [CC BY].) (B) Positron emission tomography (PET) image of the brain. (Image credited to Jens Maus, Wikimedia Commons [http://en.wikipedia.org/wiki/Image:PET-image.jpg] and released into the public domain.) Brannan E. O'Neill et al. TOJ 2018;18:236-241 Copyright © 2018 by Ochsner Clinic Foundation