Effect of second-generation motion correction algorithm on image quality and measurement reproducibili-ty of coronary CT angiography in patients with myocardial bridge and mural coronary artery
Effect of second-generation motion correction algorithm on image quality and measurement reproducibili-ty of coronary CT angiography in patients with myocardial bridge and mural coronary artery
Objectives:To determine the effect of second-generation motion correction(MC2)on image quality and measurement reproducibility of cardiac CT images in patients with myocardial bridge and mural coronary artery(MB-MCA)compared to standard(STD)images without motion correction and with first-generation motion correction(MC1).Methods:A total of 66 patients with MB-MCA in the left anterior descending branch were analyzed retrospectively.Images were reconstructed at 45％and 75％R-R intervals using STD,MC1,and MC2 algorithms.Image quality for MB-MCA was as-sessed by two observers using a four-point scale(1=poor and 4=excellent)and compared among STD,MC1,and MC2.Depth and length of MB,lumen area and minimal diameter of MCA were meas-ured and compared.Results:At 45％R-R interval,image quality scores were 1.59±0.78,2.21±0.97,and 3.21±0.62 for MCA,and 2.48±0.79,2.76±0.75,and 3.58±0.58 for MB with STD,MC1 and MC2,respectively.At 75％R-R interval,these values were 2.26±0.60,3.03±0.89,and 3.59±0.55 for MCA and 3.00±0.93,3.17±0.83,and 3.80±0.44 for MB.Although MC1 was superior to STD in displaying MCA,there was no statistical difference between the two algorithms for MB(P＞0.05).Compared with STD and MC1,MC2 statistically improved image quality for both MCA and MB and had narrower limits in interobserver agreement for measurements at both 45％and 75％R-R inter-vals.Conclusion:MC2 improves CT image quality and measurement reproducibility in patients with MB-MCA compared to STD and MC1.
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