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Fig. 3B —46-year-old 79-kg man with false-positive prediction of coronary artery calcification (CAC) on low-dose ungated MDCT. Low-dose ungated MDCT scan shows several high-attenuation spots (arrow) over atrioventricular groove, assumed to be on pathway of right coronary artery; CAC score is 3. Noise level at aortic root is much higher on low-dose ungated MDCT (SD = 29.7) than on regular-dose ECG-gated MDCT (SD = 14.7).