64排螺旋CT冠状动脉扫描中心率与重建相位宽度的选择  

Optimal Phase Window Width to Different Heart Rates in 64-Slice CT Coronary Angiography

作　　者：孙红[1] 王新江[1] 姚洪祥[1] 惠萍[1] 崔志鹏[1] 王新明[1] 

机构地区：[1]解放军总医院南楼临床部放射科,北京100853

出　　处：《中国医学影像学杂志》2011年第6期429-432,共4页Chinese Journal of Medical Imaging

摘　　要：目的分析与心率相关的64排螺旋CT冠状动脉成像中最合适的相位宽度。资料与方法选取110例回顾性心电门控CT冠状动脉检查患者,评价不同心率组(Ⅰ组,<60/min;Ⅱ组,60～62/min;Ⅲ组,63～65/min;Ⅳ组,>65/min)在R-R间期75%、60%～80%和40%～80%3个相位宽度中最佳重建相位的冠状动脉图像质量。结果Ⅰ、Ⅱ组在75%和60%～80%相位宽度图像质量高于Ⅲ、Ⅳ组(χ2=75.408,P<0.01),增加相位宽度至40%～80%,Ⅲ、Ⅳ组图像质量有明显改善。结论心率较高时增加重建相位宽度可提高64排螺旋CT冠状动脉成像的图像质量,而心率<63/min时适合用窄相位宽度扫描模式。Purpose To determine the optimal phase window width（PWW）to heart rate （HR） in 64-slice CT coronary angiography（CTCA） . Materials and Methods A total of 110 patients undergone retrospective ECG-gating CTCA were enrolled in this study. The image quality of coronary artery of 4 different HR groups （groupⅠ60 beats per minute, groupⅡ 61～62 beats per minute,groupⅢ 63～65 beats per minute, groupⅣ 65 beats per minute） were evaluated respectively with optimal phase window within 3 different PWW（ 75%, 60%～80% and 40%～80% of R-R interval）. Results The image quality of coronary artery in groupⅠ and Ⅱ with PWW of 75% and 60%～80% was higher than that of group Ⅲ and Ⅳ. The image quality of group Ⅲ and Ⅳ obviously improved when PWW was widened to 40%-80%（χ2=75.408 P0.01）. Conclusion Widening PWW can improve image quality of 64-slice CT coronary angiography in higher heart rate, while it is better to use narrow PPW protocol when the heart rate is less than 63 beats per minute.

关 键 词：冠状血管 体层摄影术 螺旋计算机 图像增强 

分 类 号：R814.42[医药卫生—影像医学与核医学]