Analysis for the tagged cardiovascular magnetic resonance imaging with a sample circumferential strain curve. A: Tagged short-axis images with 2 orthogonally oriented parallel striped tags at basal (1,4), midventricular (2, 5), and apical (3,6) levels. B: Imaging analysis–epicardial, endocardial and midwall borders of tagged LV wall image through an entire cardiac cycle. C: Color map showing pixelwise distribution of circumferential strain – more negative values indicate greater contraction. The values from the blood pool are extremely noise. D: Circumferential strain curves with each curve representing a segment.