Fig. 1.

Acquisition of left atrial strain and LV GLS by feature-tracking CMR

Panels A, B and C demonstrate CMR feature-tracking of the left ventricle myocardium in the 2- chamber, 4- chamber and 3- chamber long-axis cine views, respectively. LV endocardial contours were manually traced in the end-diastolic and end-systolic phase, and automatically tracked to derive an average LV GLS. Panel D demonstrates feature-tracking of the left atrial myocardium in the cine 2-chamber view. Left atrial feature-tracking was performed by manually tracing the end-diastolic and end-systolic left atrial endocardial border in the cine 2- chamber view, and LARS was estimated from the first peak of the left atrial strain curve, immediately prior to mitral valve opening. CMR: cardiac magnetic resonance; LARS: left atrial reservoir strain; LV: left ventricular; LV GLS: left ventricular global longitudinal strain.