320排CT容积扫描法与螺旋扫描法在低心率冠状动脉成像中的7.doc

320排CT扫描法与扫描在低心率冠状动脉中的对比cjr.wangminjie@）电 【摘要】目的320排CT volume法与helical法低心率冠状动脉的。方法128 例患者行前瞻性冠状动脉扫描组1：volume法；组2：helical法结果 组1与组2升主动脉根部CT值分别为（492.08±58.51） HU（522.72±56.91）HU±3.51) HU、（22.66±5.33）HU，差异无统计学意义（p0.05）；冠状动脉图像质量评分组1与组2均满足诊断需要冠状动脉节段优分别达到 97.5%（632/648）、96.8%（488/504）；（）（两组间图像质量差异无统计学意义（p0.05）。组1与组2 有效辐射剂量分别为 (3.21±0.2) mSv、(13.27±2.39) mSv，有统计学意义（0.05）。组为50～60ml，组剂用量为80～90ml结论320排CT前瞻性心电门控volume法与helical法均可获得满足临床诊断需要的冠状动脉图像质量，其中volume法辐射剂量更低，良 【关键词】 [Abstract] Objective To investigate the image quality and radiation dose of low heart rate for coronary CT angiography obtained with a prospectively-gated technique volume scan versus a prospectively-gated technique helical scan. Methods Coronary CT angiography obtained with 320-row CT were evaluated in 128 patients. These patients were assigned into two groups: Group 1(n=72), patients undergoing prospectively gated technique volume scan; Group 2(n=56), patients undergoing helical scan. The main branches of coronary arteries were divided into 9 segments. Meanwhile, the image quality was evaluated with a four-point grading scale. The student t test was performed to evaluate the difference between the two groups, which include image noise, excellent rate and pass rate of image, and effective radiation dose. Results The ascending aorta root CT value of group 1 and group 2 were respectively (492.08 ± 58.51) HU and (522.72 ±56.91) HU, and the image noise of the two groups were respectively (19.64 ± 3.51)HU and (22.66 ± 5.33)HU. Coronary artery image quality of group 1 and group 2 both satisfy the diagnosis. Excellent rate were respectively 97.5% (632/648), and 96.8% (488/504), and pass rate were respectively 99.7% (646/648), and 99.2% (500/504), There was no significant difference (p 0.05)in image noise, excellent rate of image, and pass rate of image between group1 and group2. Effective radiation dose of group 1 and group 2 were respectively (3.21 ± 0.23) mSv, and (13.27 ± 2.39) mSv, The differe