Fig. 2

Spectral CCTA MPR images of the heart with iodine density map overlay performed on patient 1 (see Table 1). Myocardial iodine concentration was assessed by means of polygonal ROIs placed in each short-axis segment (b, c, d) accordingly to the Standardized Myocardial Segmentation and Nomenclature of the American Heart Association. Iodine concentration was reduced in the anteroseptal myocardial segments, as visible on the three-chamber long-axis view (a). ROIs placed on each myocardial segment, either on basal (b), mid (c), and apical (d) short-axis slices, confirm reduced iodine distribution of the myocardial segments perfused by LAD artery (blue), compared to RCA (purple) and LCx artery (yellow). CCTA Conventional coronary computed angiography, LAD Left anterior descending, LCx Left circumflex, MPR Multiplanar reformatted, RCA Right coronary artery, ROI Region of interest