FIGURE 1. Example of LVEF processing within same patient with QGS (A) and MTK (B) methods. Note difference in myocardial edge detection (arrowheads), which may alter left-ventricular–time curve (arrows) between QGS (C) and MTK (D). Ejection fraction was measured at 45% using ERNA, 41% using MTK, and 30% using QGS.

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