Fig. 1

Study methods. One hundred and eight patients were included, with equal representation from 3 groups of children. Analyses were conducted using 2 commercially available vendors and three software packages with a variety of settings (6 variations in total). The same apical 4 chamber (AP4) and parasternal short axis views at the mid-ventricular papillary myscler level (SAXM) views were analyzed for each of the 6 variations. AP4 (Apical four chamber view), FR (frame rate), QLAB 10.8-Low (Low quantification smoothness setting), QLAB 10.8-Med (Medium quantification smoothness settings), QLAB 10.8-High (High quantification smoothness setting), SAXM (Short axis mid-ventricular papillary muscle)