Figure 2a:
(a) Obstructive coronary CT angiogram of proximal portion of obtuse marginal (OM, arrows) and (b) corresponding invasive angiogram in 67-year-old man (height, 67.7 cm; weight, 176 kg; body mass index, 29.5 kg/m2; effective diameter, 31.3 cm; heart rate, 44 beats per minute). Nonobstructive mixed calcified and noncalcified coronary artery disease (*) of proximal left anterior descending coronary artery (LAD) is present on both (c) coronary CT angiogram and (b) invasive angiogram. Estimated effective radiation dose was 0.90 mSv (dose-length product, 64.1 mGy ⋅ cm; CTDIvol, 5.3 mGy; SSDE, 6.16 mGy).