Article Figures & Data
Figures
- Fig. 1.
An 83-year-old male patient. In the 4 panels, the HU value (white arrows) is visible at the different monochromatic energy levels (gray arrowheads): 66 (A), 70 (B), 77 (C), and 86 keV (D). This plaque is in the fatty category by using all 4 energy levels.
- Fig. 2.
A 76-year-old male patient. In the 4 panels, the HU value (white arrows) is visible at the different monochromatic energy levels (gray arrowheads): 66 (A), 70 (B), 77 (C), and 86 keV (D). This plaque is in the mixed category for 66 (A), 70 (B), and 77 keV (C) but is in the fatty category with 86 keV (D) energy.
- Fig. 3.
Box-and-whisker plot of the attenuation values according to the different kiloelectron volt levels.
- Fig. 4.
Graph shows the HU values of the plaque. The attenuation value of 60 HU, which is considered the threshold between mixed and fatty plaques, is visible (the HU values >60 are visible in the shaded area of the graph). The dotted rectangle indicates the plaques in which a classification shift occurred according to the energy level.
- Fig. 5.
Bland-Altman plot analysis at 66 (A), 70 (B), 77 (C), and 86 keV (D).
Tables
Energy (keV) Mean HU 95% CI SD Median 95% CI 2.5–97.5 P Normal Distribution 66 60,39 51,598–69,182 27,854 56 44,000–65,171 21,525–129,475 .028a 70 55,659 47,591–63,726 25,5584 52 41,000–60,171 21,050–118,425 .028a 77 49,171 41,969–56,372 22,8155 49 37,000–52,285 18,000–105,950 .036a 86 43,049 36,483–49,615 20,8026 43 32,943–47,057 13,575–96,750 .04a Note:—P indicates percentiles.
↵a Statistically significant P value: normality rejected.
Energy (keV) Fatty Plaques Mixed Plaques 66 23 30 70 28 25 77 31 22 86 34 19
