The Effect of Snapshot Freeze on Improving Image Quality of Coronary CT Angiography in Patients with High Heart Rate_West China Medical Journal

Authors：

 ZHOUYing , CHENJiao ,  HEChuan-dong , LIUQi-yu

Department of Radiology, Mianyang Central Hospital, Mianyang, Sichuan 621000, P. R. China;

Corresponding author：

HEChuan-dong, Email: hecd735@163.com

Keywords：

Snapshot freeze; Coronary CT angiography; Image quality; Motion-corrected

DOI：

10.7507/1002-0179.20150588

Video：

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Objective To explore the effect of snapshot freeze (SSF) on the image quality of coronary artery in 64 multislice spiral CT for patients with high heart rate. Methods We retrospectively analyzed the clinical data of 98 patients with an mean heart rate of ≥ 70 beats/min who underwent coronary CT angiography examination between August 2013 and February 2014. According to the inclusion criteria, 60 patients were included in our study. The image quality of standard reconstruction (STD) and motion-corrected (MC) reconstruction based on SSF platform were analyzed. The image quality was classified into 4 grades, and the image quality of coronary segments named according to AHA standard was evaluated. Then, we compared the image quality between the two different reconstruction methods. Results Altogether 180 coronary arteries and 795 coronary segments were evaluated. Before MC reconstruction, there were 133 (73.89%) arteries and 287 (36.10%) segments had pseudomorph, while after MC reconstruction, those two numbers were 89 (49.44%) and 150 (18.87%) (P<0.05). The right coronary artery (RCA) had a higher rate of pseudomorph and a lower image quality score[91.67% (55/60), 3.32±0.40] than left anterior descending artery[60.00% (36/60), 3.69±0.42] and left circumflex artery[70.00% (42/60), 3.44±0.55], especially the S2[90.00% (54/60), 2.45±0.85]. Overall image quality was higher with the use of MC reconstruction on per-artery level (P<0.05) and most of the per-segment level (P<0.05) compared with STD, especially for RCA and its segments (P<0.05). Conclusion SSF improves image quality of coronary artery in patients with high heart rate, especially for RCA.

Citation： ZHOUYing, CHENJiao, HEChuan-dong, LIUQi-yu. The Effect of Snapshot Freeze on Improving Image Quality of Coronary CT Angiography in Patients with High Heart Rate. West China Medical Journal, 2015, 30(11): 2076-2080. doi: 10.7507/1002-0179.20150588 Copy

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7.	Pontone G, Andreini D, Bartorelli AL, et al. Feasibility and accuracy of a comprehensive multidetector computed tomography acquisition for patients referred for balloon-expandable transcatheter aortic valve implantation[J]. Am Heart J, 2011, 161(6):1106-1113.
8.	Husmann L, Leschka S, Desbiolles L, et al. Coronary artery motion and cardiac phases:dependency on heart rate ——implications for CT image reconstruction[J]. Radiology, 2007, 245(2):567-576.
9.	Ropers U, Ropers D, Pflederer T, et al. Influence of heart rate on the diagnostic accuracy of dual-source computed tomography coronary angiography[J]. J Am Coll Cardiol, 2007, 50(25):2393-2398.
10.	Flohr TG, Mccollough CH, Bruder H, et al. First performance evaluation of a dual-source CT (DSCT) system[J]. Eur Radiol, 2006, 16(2):256-268.
11.	钱萍艳, 方向明, 陈宏伟, 等. 双源CT自适应前瞻性心电门控序列扫描技术在高心率患者低剂量冠状动脉成像中的应用价值[J]. 临床放射学杂志, 2013, 32(7):1039-1043.
12.	陈文静, 刘文亚, 王海涛, 等. 心率、扇区重组、时相重建对64层螺旋CT冠状动脉成像质量的影响[J]. 中国医学影像技术, 2008, 24(5):785-788.
13.	Schroeder S, Kopp AF, Kuettner A, et al. Influence of heart rate on vessel visibility in noninvasive coronary angiography using new multislice computed tomography:experience in 94 patients[J]. Clin Imaging, 2002, 26(2):106-111.
14.	Leipsic J, Labounty TM, Hague CJ, et al. Effect of a novel vendor-specific motion-correction algorithm on image quality and diagnostic accuracy in persons undergoing coronary CT angiography without rate-control medications[J]. J Cardiovasc Comput Tomogr, 2012, 6(3):164-171.
15.	Rohkohl C, Bruder H, Stierstorfer K, et al. Improving best-phase image quality in cardiac CT by motion correction with MAM optimization[J]. Med Phys, 2013, 40(3):031901.

1. Hsieh J, Londt J, Vass M, et al. Step-and-shoot data acquisition and reconstruction for cardiac X-ray computed tomography[J]. Med Phys, 2006, 33(11):4236-4248.
2. Tang Q, Cammin J, Srivastava S, et al. A fully four-dimensional, iterative motion estimation and compensation method for cardiac CT[J]. Med Phys, 2012, 39(7):4291-4305.
3. Nagatani Y, Takahashi M, Takazakura R, et al. Multidetector-row computed tomography coronary angiography:optimization of image reconstruction phase according to the heart rate[J]. Circ J, 2007, 71(1):112-121.
4. 刘斌, 赵红, 吴兴旺, 等. 64层螺旋CT冠状动脉成像图像质量的相关影响因素分析(心脏体模模拟实验)[J]. 中华放射学杂志, 2006, 40(9):980-983.
5. Sun G, Li M, Jiang XS, et al. 320-detector row CT coronary angiography:effects of heart rate and heart rate variability on image quality, diagnostic accuracy and radiation exposure[J]. Br J Radiol, 2012, 85(116):e388-e394.
6. Ritchie CJ, Godwin JD, Crawford CR, et al. Minimum scan speeds for suppression of motion artifacts in CT[J]. Radiology, 1992, 185(1):37-42.
7. Pontone G, Andreini D, Bartorelli AL, et al. Feasibility and accuracy of a comprehensive multidetector computed tomography acquisition for patients referred for balloon-expandable transcatheter aortic valve implantation[J]. Am Heart J, 2011, 161(6):1106-1113.
8. Husmann L, Leschka S, Desbiolles L, et al. Coronary artery motion and cardiac phases:dependency on heart rate ——implications for CT image reconstruction[J]. Radiology, 2007, 245(2):567-576.
9. Ropers U, Ropers D, Pflederer T, et al. Influence of heart rate on the diagnostic accuracy of dual-source computed tomography coronary angiography[J]. J Am Coll Cardiol, 2007, 50(25):2393-2398.
10. Flohr TG, Mccollough CH, Bruder H, et al. First performance evaluation of a dual-source CT (DSCT) system[J]. Eur Radiol, 2006, 16(2):256-268.
11. 钱萍艳, 方向明, 陈宏伟, 等. 双源CT自适应前瞻性心电门控序列扫描技术在高心率患者低剂量冠状动脉成像中的应用价值[J]. 临床放射学杂志, 2013, 32(7):1039-1043.
12. 陈文静, 刘文亚, 王海涛, 等. 心率、扇区重组、时相重建对64层螺旋CT冠状动脉成像质量的影响[J]. 中国医学影像技术, 2008, 24(5):785-788.
13. Schroeder S, Kopp AF, Kuettner A, et al. Influence of heart rate on vessel visibility in noninvasive coronary angiography using new multislice computed tomography:experience in 94 patients[J]. Clin Imaging, 2002, 26(2):106-111.
14. Leipsic J, Labounty TM, Hague CJ, et al. Effect of a novel vendor-specific motion-correction algorithm on image quality and diagnostic accuracy in persons undergoing coronary CT angiography without rate-control medications[J]. J Cardiovasc Comput Tomogr, 2012, 6(3):164-171.
15. Rohkohl C, Bruder H, Stierstorfer K, et al. Improving best-phase image quality in cardiac CT by motion correction with MAM optimization[J]. Med Phys, 2013, 40(3):031901.

West China Medical Journal

The Effect of Snapshot Freeze on Improving Image Quality of Coronary CT Angiography in Patients with High Heart Rate

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