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Fig. 1A —CT scan of heart from 46-year-old man with non-small cell lung cancer. Images were acquired with 16-MDCT scanner with cardiac gating as part of preoperative evaluation of patient's tumor (temporal resolution, 250 msec; diastolic phase, A and B; systolic phase, C and D). Image reconstruction along small axis of ventricular cavities (grid, A and C) is planned at axes perpendicular to plane of interventricular septum. Such images are useful for morphologic study of right ventricle: shape of each compartment; myocardial thickness; and convexity, shape, and thickness of interventricular septum. MDCT also permits calculation of ventricular volumes and ejection fractions. If images are reconstructed in multiple phases of cardiac cycle, cine images of heart contraction can provide information regarding myocardial kinetics and help identify areas of dyskinesis, restrictive cardiomyopathy, and constrictive pericarditis.