320-Detector Row CT Narrow Acquisition Window in Single Cardiac Cycle for CTCA: Clinical Evaluation
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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 k V,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。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 k V 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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期刊类型引用(5)
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4. 彭广宇，廖焕元，刘金丰. 双低CT扫描联合迭代重建在鼻骨骨折诊断中的应用. 中国数字医学. 2020(10): 125-127 . 百度学术
5. 张卓璐，李少朕，洪楠，刘卓，陈雷. 采集时间窗对冠状动脉CT图像质量及辐射剂量的影响. 临床放射学杂志. 2019(02): 338-341 . 百度学术
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