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FIGURE 5. (A) Patient imaged at heart rate of 76 beats per minute. Axial image at level of middle right coronary artery (RCA) demonstrates typical "windmill" appearance of motion artifact (arrowhead). (B) Curved MPR image of entire length of RCA with motion artifact (arrowhead). (C) Patient with multiple extrasystolic beats during image acquisition. Stair-step artifacts (arrows) are caused by irregular rhythm and are best visualized in coronal view. Note that no irregularities occur at sternal border, excluding respiratory motion as cause of artifacts. LV = left ventricle; RV = right ventricle. (D and E) Increasing chest pain on exertion in 70-y-old man. (D) Axial image at level of left main coronary artery ostium and heavily calcified proximal and middle left anterior descending coronary artery. (E) Cross-sectional view at level of proximal left anterior descending coronary artery. Note blooming artifact (arrowhead) caused by vessel calcification, which precludes exclusion of significant coronary artery stenosis.
