Abstract:Objective: To access image quality of small branches of coronary computed tomography angiography(CCTA) using different reconstruction algorithm(including Standard, Detail, HD standard, HD detail) by high definition CT(HDCT). Methods: Thirty patients underwent CCTA by HDCT, whose main branches of coronary artery area stenosis rate<25%, were enrolled. Curved planar reconstruction(CPR) images and artery diameter of 90 small branches about four reconstruction algorithms(Standard, Detail, HD Standard and HD Detail), each patient including sinu atrial nodal artery(SANA), right conus branch(RCB), first septal branch(FSB), were obtained using Auto Coronary Analysis of GE AW4.6. CT value, noise, signal noise ratio(SNR), and contrast-to-noise ratio(CNR) of above small branches about four reconstruction algorithms were measured and calculated on original axial image of 75%R-R interval. Above objective indicators among four reconstruction algorithms were analyzed by one-way analysis of variance(ANOVA). The CPR image quality with a 4-point grading scale(1: Arterial edge was fuzzy; 2: Arterial edge was clear; 3: Arterial edge was sharp; 4: Arterial edge was very sharp) was evaluated by two experienced radiologists. CPR image quality among four reconstruction algorithms were performed with paired Wilcoxon rank sum test. Results: ①The average diameter of above small branches was less than 2 mm no matter which reconstruction algorithm was selected. ②There were statistical differences in diameter(F=3.905, P=0.011), noise(F=14.956, P=0.000) among four reconstruction algorithms. There were no statistical differences in CT value(F=1.067, P=0.366), SNR(F=1.909, P=0.132), and CNR(F=2.320, P=0.079) among reconstruction algorithms. ③Multiple comparisons between four reconstruction algorithms on diameter of small branches of the coronary arteries and image noise were made. There were no statistical differences on diameter of small branches of the coronary arteries between Standard and Detail, Detail and HD Standard, HD Standard and HD Detail(P>0.05). There were statistical differences on diameter of small branches of the coronary arteries between any other two reconstruction algorithms(P<0.05). ④There were no statistical differences on image noise between Standard and Detail(P>0.05). There were statistical differences on image noise between any other two reconstruction algorithms(P<0.05). ⑤According to the order of Standard, Detail, HD standard, and HD detail; diameter, SNR and CNR were decreasing successively. However CT value and noise were increasing successively. ⑥There were statistical differences in CPR image quality(Z=-10.583, P=0.000) between any two groups. Conclusion: For small branches of the coronary arteries(diameter<2 mm), with improving of reconstruction algorithm on spatial resolution, CPR image quality is increasing successively. However, SNR and CNR of axial original image are decreasing. In short, excellent image of small branches of the coronary arteries can be obtained by HDCT to realize different clinic requirements.
何 珍,张继扬,傅 菲,徐 勐,李 艳,邓 欣,万业达. 宝石高清CT不同重建算法对冠状动脉细小分支#br#
CTA图像质量影响的初步研究[J]. 中国临床医学影像杂志, 2016, 27(9): 634-639.
HE Zhen, ZHANG Ji-yang, FU Fei, XU Meng, LI Yan, DENG Xin, WAN Ye-da. Initial study about image quality of small branches in coronary CTA:#br#
using different reconstruction algorithm by high definition CT. JOURNAL OF CHINA MEDICAL IMAGING, 2016, 27(9): 634-639.