摘要
目的：探讨双源CT低剂量自适应扫描序列在冠状动脉成像中的应用价值。方法：将51例行双源CT冠状动脉成像的患者（心率≥65 bpm）采用自适应序列门控扫描模式，数据采集期相根据屏气时心率设定：A组24例患者（65 bpm≤心率< 75 bpm），采集期相设为70%R-R间期，B组27例患者（心率≥75 bpm），采集期相设为40%R-R间期。管电压根据体质量指数（BMI）调整： BMI≥25 kg/m2，120 kV；BMI<25 kg/m2，100 kV。分别对两组的图像质量和辐射剂量进行评价。结果：A组共评价299段冠状动脉，B组共评价345段冠状动脉。两组可评价的冠状动脉节段评分为3~4分者分别占91.3%和92.2%；评分为1~2分者右冠状动脉（RCA）最多，其次是左回旋支（LCX）；心率波动范围3~44 bpm。A组图像质量总体平均评分为（3.53±0.73）分，B组为（3.59±0.63）分。A组总体平均有效剂量为（2.85±0.93） mSv，B组为（3.10±0.86） mSv。结论：双源CT行低剂量自适应序列门控扫描能够显著降低辐射剂量，在心率≥65 bpm的患者中也可以获得满足临床诊断的图像质量。
Abstract
Objective: To evaluate the value of low-dose adaptive cardio sequence scan of dual-source CT angiography(DSCTA). Methods: Fifty-one patients with heart rate(HR)≥65 bpm underwent DSCTA with adaptive cardio sequence. They were divided into two groups according to the average HR of patients: For group A with 65 bpm≤HR<75 bpm, 70% of R-R interval was used. For group B with HR≥75 bpm, 40% of R-R interval was chosen. Patients with a body mass index(BMI)≥25 kg/m2 were examined with a tube voltage of 120 kV, whereas BMI＜25 kg/m2 were examined with 100 kV. Both image quality and radiation dose of the two groups were analyzed. Results: A total of 299 coronary artery segments were evaluated in group A and 345 segments in group B. The third and forth grade of the coronary segments for two groups were 91.3% and 92.2%; Right coronary artery(RCA) had the largest percentage of coronary segments in the first and second grade for two groups, and the next was left circumflex artery(LCX); The range of heart rate was 3~44 bpm. The mean score of image quality of group A and group B was (3.53±0.73) and (3.59±0.63) scores, while the total mean effective dose was (2.85±0.93) mSv and (3.10±0.86) mSv. Conclusion: Low-dose adaptive cardio sequence scan for DSCTA can substantially reduce radiation exposure, and obtain good diagnostic image quality in patients with HR≥65 bpm.
关键词
冠状血管 /
辐射剂量 /
体层摄影术 /
X线计算机
Key words
Coronary vessels /
Radiation dosage /
Tomography /
X-ray computed
阎 静;成官迅;刘国顺;虞康惠.
双源CT低剂量自适应扫描序列在冠状动脉成像中的应用[J]. 中国临床医学影像杂志. 2012, 23(6): 393-396
YAN Jing;CHENG Guan-xun;LIU Guo-shun;YU Kang-hui.
Value of low-dose adaptive cardio sequence scan for dual-source CT coronary angiography[J]. Journal of China Clinic Medical Imaging. 2012, 23(6): 393-396
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