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Figure 10


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).