The various planar and single‐photon emission computed tomography (SPECT) performance characteristics studied and the corresponding reference that describes the measurement procedure, where FWHM is the full width at half maximum, NEMA is the National Electrical Manufacturers Association, and AAPM is the American Association of Physicists in Medicine. (a) Indicates performance characteristics tested without low‐energy, high‐resolution collimators, and (b) indicates performance characteristics not tested for intracamera variability