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Fig. 6A —60-year-old woman with suspected coronary artery disease. Geometric distortion due to spiral acquisition, where black "shadow" or "rod" artifact next to contrast-filled right coronary artery is due to miscalculation by reconstruction algorithm. During spiral acquisition, position registered by each view shifts. Miscalculation may cause hypodense artifacts (arrows) that rotate around high-density contrast-filled coronary artery. Note change in artifact position from A to C that is also observed on corresponding levels at coronal reconstruction (D). Mean heart rate was 66 beats per minute. R-R interval during acquisition varied between 916 and 977 milliseconds.