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Fig. 1. —Drawing shows different cardiac cycles using 10 slices per rotation overlapping reconstruction (491 axial slices from 50 rotations). When slice center was on R wave or nearest R wave, slice was defined as end-diastolic phase. All end-diastolic (ED) phase slices were collected to produce an ED phase data set. All [ED + 1] phase slices were collected to produce [ED + 1] phase set data set. Other phase data sets were created in same manner. Note conventional 360° reconstruction and 180° helical reconstruction algorithms. Framing number of R-R interval was generated as mean R-R interval (msec) / 80 (msec) and rounded to integers. Also note methods to deal with beat-to-beat variability. FWHM = full width at half maximum (time resolution to obtain one axial slice).