DENSE Image QualityImage quality was high or adequate in the majority of DENSE and feature-tracking acquisitions for circumferential strain (Table E2 [online]). Fourteen of 783 (1.8%) DENSE myocardial segments were nondiagnostic. Two participants underwent nondiagnostic DENSE imaging. All of the cine images were diagnostic. The intraclass correlation coefficient was excellent (>0.90) for all intraobserver and interobserver analyses. The mean bias between attempts or operators was not clinically significant at 1%