| 320排 CT 前瞻性心电门控容积扫描窄采集窗设置的临床评价? |
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| 引用本文： | 邢桂荣,包丽丽,刘挨师.320排 CT 前瞻性心电门控容积扫描窄采集窗设置的临床评价?[J].CT理论与应用研究,2016(4):445-452. |
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| 作者姓名： | 邢桂荣 包丽丽 刘挨师 |
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| 作者单位： | 1. 内蒙古医科大学附属医院影像诊断科,呼和浩特,010050;2. 内蒙古医科大学基础医学院,呼和浩特,010059 |
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| 基金项目： | 内蒙古自治区卫生和计划生育委员会科研项目(201301050)。 |
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| 摘 要： | 目的：通过低心率下宽采集窗与窄采集窗图像质量与辐射剂量对比，明确窄采集窗320排 CT 冠脉造影的临床应用价值。方法：前瞻性选取2015年9月至2016年1月拟行 CTCA 且心率（HR）≤65次/min、心率变异度（HRv）≤ 5次/min 的患者80例，平均年龄51岁（范围：36岁～83岁）。所选患者随机分为 A、B 两组，其中 A 组（n =40）采集期相设置为 R-R 间期70％～80％。B 组（n =40）采集期相设置为 R-R 间期30％～80％。两组设置管电压100 kV，依据体质量指数自动设置管电流300～580 mA。评价并比较 A、B 两组辐射剂量与图像质量。结果：A、B两组辐射剂量差异具有统计学意义（2.02 mSv ±0.78 mSv vs 4.35 mSv ±0.85 mSv，t =-12.474， P =0.000）。A 和 B 两组可评估率差异无统计学意义（χ2 =0.215，P =0.643）。A 组平均评分3.61±0.53，B 组平均评分3.71±0.48，Z =-3.074，P =0.002，差异有统计学意义。A、B 两组主动脉根部衰减值差异无统计学意义（t =-1.132，P =0.261）。结论：320排螺旋 CT 窄采集窗设置可以提供可评估的图像质量，从而大幅度减少辐射剂量。
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| 关 键 词： | 体层摄影术 X 线计算机 冠状动脉 图像质量 辐射剂量 |
320-Detector Row CT Narrow Acquisition Window in Single Cardiac Cycle for CTCA:Clinical Evaluation |
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| XING Gui-rong,BAO Li-li,LIU Ai-shi.320-Detector Row CT Narrow Acquisition Window in Single Cardiac Cycle for CTCA:Clinical Evaluation[J].Computerized Tomography Theory and Applications,2016(4):445-452. |
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| Authors: | XING Gui-rong BAO Li-li LIU Ai-shi |
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| Abstract: | Objective: To evaluate the value of narrow acquisition acquisition CTCA by single cardiac cycle using 320-detector row CT. Methods: 80 patients (HR ≤ 65 bpm, HRv ≤ 5 bpm) were enrolled from september 2015 to January 2016 in this study. All of patients were divided into two groups. Group A included 40 patients with acquisition phase 70%~80% in R-R interval and Group B with acquisition phase 30%~80% in R-R interval. Both two groups with tube voltage 100 kV and tube current tailored to BMI (300~580 mA). Two groups were evaluated by radiation dose and image quality (all coronary artery segments scaleand percentage of assessable, aorta attenuation). A P value below 0.05 was considered to be statistically significant. Results: All patients include group A and B successfully underwent single cardiac cycle CTCA. The mean effective dose for group A was 2.02 mSv ±0.78 mSv; this represents a 46% reduction as compared with that group B (4.35 mSv ±0.85 mSv, t = -12.474,P = 0.000). The mean image quality score was 3.61 ±0.53 obtained with Group A versus 3.71 ±0.48 obtained with Group B (Z = -3.074,P = 0.002). The difference of the percentage of assessable coronary artery segments in both groups was not statistically significant (χ2 = 0.215,P = 0.643). The difference of aorta attenuation in both groups was not statistically significant (t = -1.132,P = 0.261). Conclusions: narrow acquisition acquisition CTCA may reduce the radiation dose keeping image quality assessable in patients with low HR (≤ 65 bpm) and HRv (≤ 5 bpm). |
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| Keywords: | tomography X-ray computed coronary artery image quality radiation dose |
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