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Fig. 2D —59-year-old man imaged for suspected coronary artery disease. Stairstep artifact due to premature atrial contraction with extra systole, followed by compensatory long R-R interval (between sixth and seventh R-R peaks) Note that premature beat is approximately in middle of acquisition (A), which is also true in images (B-D). Note stairstep in right coronary artery (RCA) (arrows) at 3D reconstructions and central luminal line projections (B) and in two long-axis perpendicular curved multiplanar reconstructions (C, D). In these perpendicular curved multiplanar reconstructions, coronary artery is usually more affected in one direction than in other. Step had virtually no effect on left anterior descending coronary artery (LAD in B). Mean heart rate was 59 beats per minute. R-R interval during acquisition varied between 644 and 1,281 milliseconds.