心率对320排CT冠状动脉成像图像质量和辐射剂量影响的分析  

Impact of Heart Rate on Image Quality and Radiation Dose in 320-detector CT Coronary Angiography

作　　者：陈明[1] 周瑞珏[2] 邢伟[1] 杨玲[2] 丁玖乐[1] 

机构地区：[1]常州市第一人民医院放射科 [2]常州市第一人民医院心内科

出　　处：《中国医学计算机成像杂志》2014年第5期394-397,共4页Chinese Computed Medical Imaging

基　　金：2013年常州市科技支撑-社会发展项目;项目编号:CE20135063~~

摘　　要：目的：探讨不同心率条件下,320排容积CT冠状动脉血管成像的图像质量和辐射剂量.方法：收集行冠状动脉血管成像检查的90例患者,根据扫描时患者心率分为3组,A组心率＜65次/min,B组心率65～80次/min,C组心率＞80次/min,对各组的图像质量、辐射剂量进行统计学分析.结果：A组图像质量评分高于B组、C组,差异有统计学意义（x^2=11.59,P＜0.01）,A组平均辐射剂量（ED）分别比B组低25.78％、71.53％.A组与B组、A组与C组、B组与C组ED平均值差异均有统计学意义（P＜0.05）.结论：320排CT冠状动脉血管成像图像质量较高,在相同心率条件下,图像质量较多排螺旋CT更高,患者辐射剂量较多排螺旋CT显著减低.Purpose： To evaluate the impact of heart rate on the image quality and radiation dose in 320-detector CT coronary angiography （CTCA）. Methods： A total of ninety patients who underwent CTCA were divided into three groups according to their heart rates during the scan. Group A： heart rate was less than 65 beats/rain; group B： heart rate was between 65 beats/rain and 80 beats/min, group C： heart rate was more than 80 beats/rain. The differences of image quality and effective dose between different groups were statistically analyzed. Results： Image quality of group A was higher than that of group B and group C, the difference of image quality was with statistically significant（x2=11.59, P〈0.01）. Compared with group B and group C, the effective radiation dose of group A was lowered for 25.7% and 71.53%. Statistical significant differences were observed between group A and group B, group A and group C, group B and group C （P〈0.05）. Conclusion： CTCA images using 320-detector CT have excellent quality. When the patients were with the same heart rate, the image quality of 320-detector CT is better than multi-slice spiral CT, and the radiation dose is much lower.

关 键 词：冠状动脉 体层摄影术 X线计算机 心率 辐射剂量 

分 类 号：R816.2[医药卫生—放射医学]