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Figure 3 A standardized circular region of interest (ROI) of 20 pixels was placed at different locations around the circumference of the heart. A reference line (II) was traced through the center of the left ventricle (LV), and the intersection of the posterior LV with the right ventricle (RV). Based on this reference line, the LV myocardium was divided into three equal triangular regions, corresponding with the coronary artery territories; ROIs were placed in the center of the myocardium at the following locations: posteroseptal (1), midseptal (2), anteroseptal (3), lateral (4), and inferior (5). The posteroseptal ROI was positioned at 30 degrees posterior to line I.
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