Correlation between Low Tube Voltage in Dual Source CT Coronary Artery Imaging with Image Quality and Radiation Dose

• Published in: Journal of Huazhong University of Science and Technology. Medical sciences Vol. 34; no. 4; pp. 616 - 620
• Main Author: 雷子乔 韩萍 徐海波 余建明 刘红利
• Format: Journal Article
• Language: English
• Published: Heidelberg Huazhong University of Science and Technology 01.08.2014; Department of Radiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China%Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
• Subjects: Adult; Aged; Body Mass Index; Chest Pain - diagnostic imaging; Coronary Angiography - methods; Coronary Vessels - diagnostic imaging; Female; Humans; Male; Medicine; Medicine & Public Health; Middle Aged; Tomography, X-Ray Computed - methods; 冠状动脉; 双源; 图像质量; 成像; 简单随机抽样; 管电压; 辐射剂量; dual source CT; radiation dose; tomography; coronary angiography; low body mass index
• ISSN: 1672-0733; 1993-1352
• DOI: 10.1007/s11596-014-1326-9

The influence of low tube voltage in dual source CT（DSCT） coronary artery imaging on image quality and radiation dose and its application value in clinical practice were investigated. Totally, 300 cases of chest pain with low body mass index（BMI 〈18.5 kg/m2） subjected to DSCT coronary artery imaging were prospectively enrolled. The heart rate in all patients were greater than 65/min. The retrospective ECG gated scanning mode and simple random sampling method were used to assign the patients into groups A, B and C（n=100 each）. The patients in groups A, B and C experienced 120-, 100-, and 80-kV tube voltage imaging respectively, and the image quality was evaluated. The CT volume dose index（CTDIvol） and dose length product（DLP） were recorded, and the effective dose（ED） was calculated in each group. The image quality scores and radiation doses in groups were compared, and the influence of tube voltage on image quality and radiation dose was analyzed. The results showed that the excellent rate of image quality in groups A, B and C was 95.69%, 94.72% and 96.33% respectively with the difference being not statistically significant among the three groups（P〉0.05）. The CTDIvol values in groups A, B and C were 51.35±12.21, 21.28±7.13 and 6.34±3.34 mGy, respectively, with the difference being statistically significant（P〈0.05）. The ED values in groups A, B and C were 9.27±1.63, 4.56±2.29 and 2.29±1.69 mSv, respectively, with the difference being statistically significant（P〈0.05）. It was suggested that for the patients with low BMI, the application of DSCT coronary artery imaging with low tube voltage can obtain satisfactory image quality, and simultaneously, significantly reduce the radiation dose.