前瞻性心电门控技术在双源CT冠状动脉成像中的应用价值

摘要

目的:比较双源CT冠状动脉成像(CTCA)前瞻性心电门控与回顾性心电门控扫描的辐射剂量及图像质量.方法:以相同纳入标准,选取50例行前瞻性心电门控扫描的患者作为前瞻门控组,另选取50例行回顾性心电门控的患者作为回顾门控组.由两名CT医师分别对两组CTCA图像进行评估.记录并比较两组患者一般临床资料、辐射剂量及图像质量评分.结果:两组患者性别、年龄、体重指数、平均心率、心率波动、扫描范围差异均无统计学意义(P＞0.05).前瞻门控组有效辐射剂量(3.80±0.46)mSv,回顾门控组有效辐射剂量(20.64±3.14)mSv,两组差异具有统计学意义(P＜0.001).两组图像质量的差异无统计学意义(x2=1.166,P=0.761).结论:前瞻性心电门控较回顾性心电门控技术能够在保证图像质量的同时明显降低辐射剂量.%Objective:To compare radiation dose and image quality between prospective and retrospective ECG-gating CT coronary angiography (CTCA) with dual-source CT. Methods: A tota 1 of 100 patients with heart rate less than 70 beats per minute were selected in same standard, 50 patients underwent CTCA using prospective ECG-gating as prospective group, another 50 patients underwent CTCA using retrospective ECG-gating as retrospective group. Two independent radiologists assessed the image quality of CTCA used blinding method. General clinical information, scan range, effective radiation dose and image quality were recoded and compered between two group. Results: Sexaul, age, body mass index, heart rate, heart rate variability and scan range between two group had no significant difference ( P >0. 05). The average effective dose of prospective group and retrospective group was (3. 80±0. 46) mSv and (20. 64±3. 14) mSv , respectively ( P <0. 001) . No significant difference of image quality was found between two groups (x2 = 1. 166 · P -0. 761) . Conclusion: Prospective ECG-gating CTCA can effectively reduce radiation dose without compromising image quality.