Analysis of SPECT. For each study, SPECT analysis was based on one vertical long-axis slice and three short-axis slices. In each patient, corresponding vertical long- and short-axis tomograms from the 99mTc-PYP and 99mTc-MIBI SPECT image sets were aligned. Additionally, one vertical long-axis slice and three short-axis views from the apical, middle, and basal ventricular levels were chosen for comparison. The vertical long-axis slice was used to evaluate the apical region, which was divided into two segments, while each short-axis slice was divided into six segments (Fig. 1). All SPECT images were analyzed by two experienced observers with no knowledge of the patient's clinical history. Semiquantitative visual analysis was performed by assigning regional tracer uptake activity by a four-point scoring system (defect score): 3 = absent uptake; 2 = significantly reduced uptake; 1 = mildly reduced uptake; 0 = normal uptake. Disagreements in interpretation were resolved by consensus. We defined the number of segments in which the 99mTc-PYP accumulated as the extent score (ES). We defined the sum of defect scores in the infracted area in which the 99mTc-PYP accumulated as the total defect score (TDS).
Analysis of SPECT. For each study, SPECT analysis was based on one vertical long-axis slice and three short-axis slices. In each patient, corresponding vertical long- and short-axis tomograms from the 99mTc-PYP and 99mTc-MIBI SPECT image sets were aligned. Additionally, one vertical long-axis slice and three short-axis views from the apical, middle, and basal ventricular levels were chosen for comparison. The vertical long-axis slice was used to evaluate the apical region, which was divided into two segments, while each short-axis slice was divided into six segments (Fig. 1). All SPECT images were analyzed by two experienced observers with no knowledge of the patient's clinical history. Semiquantitative visual analysis was performed by assigning regional tracer uptake activity by a four-point scoring system (defect score): 3 = absent uptake; 2 = significantly reduced uptake; 1 = mildly reduced uptake; 0 = normal uptake. Disagreements in interpretation were resolved by consensus. We defined the number of segments in which the 99mTc-PYP accumulated as the extent score (ES). We defined the sum of defect scores in the infracted area in which the 99mTc-PYP accumulated as the total defect score (TDS).
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