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Fig. 3 —Figure shows regions of interest (ROIs) drawn and image histogram for 71-year-old man from calcium group (coronary calcium score, 11.6). Image a, which is from noncontrast electron beam tomography slice, shows proximal left anterior descending (LAD) artery. Image b shows ROIs drawn to identify normal blood pool (BP) and LAD artery. Normal blood pool histogram is shown in blue and histogram for LAD artery is shown in green. Fitted gaussian curve is shown in black. Lipid threshold is marked by red line (-0.9 H for this patient). Lipid-rich lesion found by our automated software (Plaquant) is shown overlaid in red on image b. QUANT = Plaquant.