CAJ | 학술논문

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.
목적 비교쌍원CT전첨성심전문공대라거소묘화비문공대라거소묘재주동맥성상중적도상질량화복사제량.방법 련속수집50례(A조)림상가의주동맥협층혹자협층술후적환자진행전첨성심전문공대라거소묘,재련속수집50례(B조)진행비문공대라거소묘.유2명유경험적의사대2조도상질량진행평분후계산균치,병기록측량치화복사제량.응용비삼수검험화량독립양본적f검험비교2조환자적도상질량화복사제량.결과 2조환자적총체도상질량평분[A화B조분별위(1.18±0.40)화(1.23±0.31)분]차이무통계학의의(U=1.20,P=0.23).A조채용심전문공대라거소묘모식적복사제량위(1.49 ±0.38)mSv,저우비문공대라거소묘모식적(2.79±0.54) mSv,2조차이유통계학의의(t=13.677,P＜0.05).결론 쌍원CT심전문공대라거소묘이교저적복사제량획득청석적주동맥도상,재불공제심솔적정황하능제고우관상동맥개구적현시,재저심솔성상시도상질량명현우우비문공조.
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.