双源CT心电门控和非门控大螺距主动脉成像质量与辐射剂量的对照研究
Comparison of prospective electrocardiography-gating high-pitch mode and without electrocardiography-synchronization high-pitch mode acquisition for the image quality and radiation doses of the aortic using dual-source CT
目的 比较双源CT前瞻性心电门控大螺距扫描和非门控大螺距扫描在主动脉成像中的图像质量和辐射剂量.方法 连续搜集50例(A组)临床可疑主动脉夹层或者夹层术后的患者进行前瞻性心电门控大螺距扫描,再连续搜集50例(B组)进行非门控大螺距扫描.由2名有经验的医师对2组图像质量进行评分后计算均值,并记录测量值和辐射剂量.应用非参数检验和两独立样本的f检验比较2组患者的图像质量和辐射剂量.结果 2组患者的总体图像质量评分[A和B组分别为(1.18±0.40)和(1.23±0.31)分]差异无统计学意义(U=1.20,P=0.23).A组采用心电门控大螺距扫描模式的辐射剂量为(1.49 ±0.38)mSv,低于非门控大螺距扫描模式的(2.79±0.54) mSv,2组差异有统计学意义(t=13.677,P<0.05).结论 双源CT心电门控大螺距扫描以较低的辐射剂量获得清晰的主动脉图像,在不控制心率的情况下能提高右冠状动脉开口的显示,在低心率成像时图像质量明显优于非门控组.
更多Objective To evaluate the application of prospective ECG-gating Flash spiral scan mode dual-source CT in aortography,and compare it's image quality and radiation dose with without ECG-synchronization high-pitch spiral scanning mode.Methods Fifty consecutive patients (Group A) with suspected aortic dissection or after operations for the aortic dissection were scanned with prospective ECG-gated high-pitch scan and another 50 consecutive patients(Group B) were analyzed by non-ECG-gated high-pitch scan.Image quality of the aortic was assessed by two independent readers.Image noise was measured,radiation dose estimates were calculated.The imaging quality of the aortic and the radiation dose were compared with Mann-whitney U and t test.Results The average image quality score [(1.18 ± 0.40) in group A and (1.23 ±0.31) in group B] showed no significant difference between group A and group B(U =1.20,P =0.23).The mean radiation dose of group A was lower than that of group B [(1.49 ± 0.38) mSv in group A,(2.79 ± 0.54) mSv in group B,t =13.677,P < 0.05].Conclusion Prospective ECG-gated dualsource CT Flash spiral scanning with low radiation dose and good image quality in the aortic dissection with high value of clinical application.
More- 浏览:588
- 被引:17
- 下载:292
相似文献
- 中文期刊
- 外文期刊
- 学位论文
- 会议论文