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Fig. 1A —29-segment model of left ventricle. Diagrams illustrate basal and mid short-axis slices (A), apical short-axis slice (B), and horizontal long-axis slice (C). In diagrams that correspond to basal slices 1 and 2 (A) and mid slices 3 and 4 (C), left ventricular (LV) myocardium is divided into six segments including anterior, lateral, inferior, and septal walls, whereas it is divided into four segments in slice 5 of diagram (B), which corresponds to apical slice 5 in diagram (C). LV myocardium at extreme tip of ventricle apex (gray shading, C), where there is no longer cavity, is defined as another segment, apex. RV= right ventricle.