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Fig. 3 —Bar graph shows pooled mean coronary attenuation values compared for each vessel on superior vena cava (SVC) (25-mL and 50-mL studies) and IV (100-mL) studies. In comparison of 25 mL SVC and 100-mL IV studies, for left anterior descending coronary artery (LAD), p = 0.0055; for left circumflex coronary artery (LCX), p = 0.0113; and for right coronary artery (RCA), p = 0.0017. Also, in comparison between SVC 50-mL and IV 100-mL studies, for LAD, p = 0.7664; for LCX, p = 0.5724; and for RCA, p = 0.9797. Blue = RCA, Red = LAD, Yellow = LCX. Note: Although some of pairwise comparisons are statistically significant, there is no significant difference in overall full-width at half-maximum (FWHM) because of interactive (i.e., combined) effect of segment x concentration (p value of type 3 test of fixed effects = 0.9102).