前瞻性心电门控技术在256层CT冠状动脉成像中的应用

目的:比较前瞻性心电门控(前门控)与回顾性心电门控(后门控)螺旋CT冠状动脉成像的图像质量及辐射量,探讨前门控CTA对冠心病的临床应用价值。方法:分析接受前瞻性心电门控冠状动脉检查的109例患者及接受回顾性心电门控冠状动脉检查的99例患者的影像学资料,对其图像质量及辐射量进行评价。结果:前门控与后门控两组图像质量评分分别为4.97±4.78和4.36±0.69,两组间比较差异无统计学意义(P>0.05),前门控与后门控两组有效辐射量分别为(3.13±0.57)mSv和(10.21±2.43)mSv,两组间比较差异有统计学意义(P<0.05)。结论:在一定的心率(<75次/分)范围内,256层螺旋CT前门控冠状动脉成像的图像诊断质量与后门控具有一致性,且前门控明显降低了辐射量。

The application of prospective electrocardiography-triggered 256-slice computed tomography in coronary artery imaging:image quality and radiation dose

Objective=To compare image quality and radiation dose between prospective electrocardiography （ECG） triggered and retrospective ECG--gated coronary computed tomographic angiography （CCTA） by using 256 slice computed tomography （MSCT）. Methods： 109 cases we.re scanned by using prospective ECG-triggered CCTA and 99 cases were scanned by using retrospective ECG gated CCTA with 256 slice MDCT. Image quality and the radiation dose were compared in these two groups. Results：Image quality scores in prospective and retrospective ECG-gated groups were 4. 97±0.78 and 4.36 ± 0.69, respectively. There were no significant differences in image quality between two groups （P〉0.05）. The effec- tive doses were （3. 13±0.57）mSv and （10.21 ±2. 4）mSv in these two groups （P〈0.05）. Conclusion.. Prospeclive ECG triggered CCTA can obtain equivalent image quality in comparison with retrospective ECG gated CCTA, however, the effec tive radiation dose are reduced remarkably.