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Figure 1


Fig. 1A —60-year-old man with atypical chest pain. Average heart rate was 75.6 beats/min, and heart rate variability was 1.6 beats/min. Image quality of 64-MDCT coronary angiography was rated good to excellent in all segments. Curved planar CT image along centerline of left anterior descending artery shows coronary artery stenosis in proximal segment. Reconstructions perpendicular to proximal left anterior descending artery (magnified views 1-3) show noncalcified plaque causing approximately 70% luminal diameter stenosis. Maximum intensity projection (inset 4) shows plaque composed of calcified and noncalcified portions.