“…Our group recently developed a method to measure left ventricular strain from gated myocardial perfusion images and showed that it correlates well with TTE-derived strain [ 5 ]. Apical strain index (ASI), apex-to-base ratio (ABR), and ejection fraction to global strain are three parameters that have been used to distinguish cardiac amyloidosis from other causes of left ventricular hypertrophy (LVH) [ [6] , [7] , [8] ]. Previous studies have used TTE-derived strain values to calculate these indices.…”