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Fig. 6B —Relationship of CT attenuation values between plaque and
intracoronary enhancement. Graphs show results for soft (A) and
intermediate (B) plaques. Repeated measures analysis of variance
revealed that CT attenuation values of soft plaque were different among
intracoronary artery enhancement levels (p < 0.01) and
combinations of heart rates and reconstruction algorithms (p <
0.01). Scheffé test for multiple pairwise comparisons revealed that CT
attenuation values were significantly different between intracoronary
enhancement of 150 and 350 H (p < 0.01), 150 and 450 H (p
< 0.01), and 250 and 450 H (p < 0.01) on static cardiac phantom
using half reconstruction and between intracoronary enhancement of 150 and 350
H (p < 0.01), 150 and 450 H (p < 0.01), 250 and 350 H
(p < 0.01), and 250 and 450 H (p < 0.01) on cardiac
phantom at 50 beats per minute (bpm) using half reconstruction algorithm.
Scheffé test revealed that CT attenuation values of plaque on
intracoronary artery enhancement of 150 H were significantly different between
static cardiac phantom with half reconstruction algorithm and 65 bpm with half
reconstruction (p < 0.01) and between 50 bpm with half
reconstruction and 65 bpm with half reconstruction (p < 0.01).
Scheffé test also revealed that CT attenuation values of plaque on
intracoronary artery enhancement of 250 H were significantly different between
static phantom with half reconstruction and 65 bpm with half reconstruction
(p < 0.01) and between 50 bpm with half reconstruction and 65 bpm
with half reconstruction (p < 0.01). In contrast, CT attenuation
values of intermediate plaque were not statistically different based on
intracoronary artery enhancement level (p = 0.09) or combinations of
heart rate and reconstruction algorithm (p = 0.10).
