The Application of 70 kV and Sonogram-affirmed Iterative Reconstruction Technique in CT Examination for Children with Congenital Heart Disease_West China Medical Journal

Authors：

 ZhaoJin , LiWanjiang ,  LiZhenlin

Department of Radiology, West China Hospital, Chengdu, Sichuan 610041, P. R. China;

Corresponding author：

LiZhenlin, Email: lzlcd01@126.com

Keywords：

Children with congenital heart disease; Iterative reconstruction; Radiation dose

DOI：

10.7507/1002-0179.201600380

Video：

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Objective To evaluate the value of 70 kV and sonogram-affirmed iterative reconstruction technique in CT examination for children with congenital heart disease. Methods Thirty children with congenital heart disease who underwent CT scan between January and September 2014 were included in this study. According to the different tube voltage, they were randomly divided into group A (80 kV) and group B (70 kV), with fifteen in each. All the children were scanned on a dual-source-CT (Siemens Definition Flash). Group A used filtered back projection reconstruction. Group B used sonogram-affirmed iterative reconstruction. We measured and calculated the pulmonary artery signal-to-noise ratio at the level of main pulmonary artery window, the signal-to-noise ratio of the ascending aorta, noise ratio contrast between the pulmonary artery and erector spinae and between the ascending aorta and erector spinae. The image quality for congenital heart disease was assessed by two senior radiologists. The measurement of radiation dose included effective dose (ED), volume CT dose index (CTDI_vol) and dose length product (DLP). Results There were no significant differences between group A and B in terms of pulmonary artery signal-to-noise ratio (14.54±3.77, 11.23±2.52), the signal-to-noise ratio of the ascending aorta (14.76±3.41, 12.31±3.47), the noise ratio contrast between pulmonary artery and erector spinae (12.04±3.96, 9.18±3.76) and between the ascending aorta and erector spinae (12.47±4.59, 9.77±4.41) (P > 0.05). There was significant difference between group A and group B in CTDI_vol[(0.53±0.09), (0.38±0.03) mGy], DLP[(12.93±1.79), (6.67±0.72) mGy·cm], and ED[(0.34±0.05), (0.17±0.02) mSv] (P < 0.05). Conclusion The application of 70 kV and sonogram-affirmed iterative reconstruction technique in CT examination for children with congenital heart disease can significantly reduce the radiation dose without any influence on image quality.

Citation： ZhaoJin, LiWanjiang, LiZhenlin. The Application of 70 kV and Sonogram-affirmed Iterative Reconstruction Technique in CT Examination for Children with Congenital Heart Disease. West China Medical Journal, 2016, 31(8): 1398-1401. doi: 10.7507/1002-0179.201600380 Copy

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1. Ghafourian K, Younes D, Simprini LA, et al. Scout view X-ray attenuation versus weight-based selection of reduced peak tube voltage in cardiac CT angiography[J]. JACC Cardiovasc Imaging, 2012, 5(6):589-595.
2. 林旭波, 郑文龙, 吴爱琴, 等.下肢低kVp CT血管造影研究[J].实用放射学杂志, 2013, 29(10):1655-1657, 1661.
3. 邓利萍, 李真林, 袁元, 等.双源CT低剂量扫描在胸部普通检查中的应用价值[J].华西医学, 2013, 28(5):696-700.
4. 庄勋慧, 冯卫华, 徐文坚, 等.迭代重建技术在CT检查青年骶髂关节中的应用[J].中国医学影像技术, 2012, 28(4):796-799.
5. Huang MP, Liang CH, Zhao ZJ, et al. Evaluation of image quality and radiation dose at prospective ECG-triggered axial 256-slice multi-detector CT in infants with congenital heart disease[J]. Pediatr Radiol, 2011, 41(7):858-866.
6. Thomas KE, Wang B. Age-specific effective doses for pediatric MSCT examinations at a large children's hospital using DLP conversion coefficients:a simple estimation method[J]. Pediatr Radiol, 2008, 38(6):645-656.
7. 罗艺, 余建群, 李学明, 等.双源CT在单心室中的诊断价值[J].生物医学工程学杂志, 2013, 30(3):508-512.
8. Paul JF, Rohnean A, Sigal-Cinqualbre A. Multidetector CT for congenital heart patients:what a paediatric radiologist should know[J]. Pediatr Radiol, 2010, 40(6):869-875.
9. Stolzmann P, Goetti R, Baumueller S, et al. Prospective and retrospective ECG-gating for CT coronary angiography perform similarly accurate at low heart rates[J]. Eur J Radiol, 2011, 79(1):85-91.
10. 张月俏, 任宏, 沈国惠.双源CT Flash Spiral技术在胸部扫描中的应用和防护价值[J].中华放射医学与防护杂志, 2011, 31(3):370-371.
11. 卞佳, 张培功, 姜兴岳, 等.双源CT新技术在儿童胸部检查中的应用[J].实用放射学杂志, 2013, 29(4):628-630, 645.
12. 唐红, 白文娟, 安琪, 等.超声心动图对主动脉缩窄的诊断价值[J].中华医学超声杂志:电子版, 2006, 3(6):375-376.
13. 彭礼清, 杨志刚, 余建群, 等.心电门控双源CT血管造影在评价主动脉缩窄中的临床价值[J].生物医学工程学杂志, 2013, 30(1):89-94.
14. Brenner DJ, Hall EJ. Computed tomography——an increasing source of radiation exposure[J]. N Engl J Med, 2007, 357(22):2277-2284.
15. 卞佳, 张培功, 姜兴岳, 等.原始数据域迭代重建技术在颅脑CT检查中的初步应用[J].实用放射学杂志, 2013, 29(11):1840-1843.

West China Medical Journal

The Application of 70 kV and Sonogram-affirmed Iterative Reconstruction Technique in CT Examination for Children with Congenital Heart Disease

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