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Fig. 2B —Bar graphs of proximal (blue), mid (red), and distal (yellow) coronary attenuation values. Bar graphs show coronary attenuation values for right coronary artery (RCA) (A), left anterior descending coronary artery (LAD) (B), and left circumflex coronary artery (LCX) (C) on superior vena cava (SVC) (25-mL and 50-mL studies) and IV (100-mL) studies. Significance of grouped segments (proximal, mid, and distal) for each injection is compared with threshold value of 250 H.