Technetium pyrophosphate nuclear scintigraphy for cardiac amyloidosis: Imaging at 1 vs 3 hours and planar vs SPECT/CT. - Sperry BW; Burgett E; Bybee KA; McGhie AI; O'Keefe JH; Saeed IM; Thompson RC; Bateman TM (Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology, 2020)