双源CT冠状动脉造影MinDose技术的应用价值

目的 探讨MinDose技术在双源CT冠状动脉造影中的辐射剂量及对图像质量的影响.方法 连续选取120例患者进行双源CT冠状动脉造影,将患者随机分成A1和A2组,每组60例.A1组ECG-Pulsing预设窗外管电流降为最大管电流的20%,A2组窗外管电流应用MinDose技术降为4%.然后对A1和A2组的图像质量、图像噪声、容积CT剂量指数(CTDIvol)和有效剂量(E)进行评估.结果 A1和A2两组图像质量评分分别为4.6±0.3和4.5±0.5,差异无统计学意义(t=0.2,P＞0.05).A1和A2两组平均容积CT剂量指数(CTDIvol)分别为(40.2±9.6)和(36.4±9.1)mGy,有效剂量(E)分别为(9.1±2.2)和(8.1±1.9)mSv,差异均有统计学意义(t=2.2、2.7,P＜0.05).结论 应用MinDose技术不仅可以明显降低辐射剂量,而且能满足诊断要求.

Abstract：

Objective To evaluate the radiation dose and image quality of MinDose techniques in dual-source CT coronary artery angiography.Methods 120 consecutive patients undergoing cardiac CT scans were randomly assigned into 2 groups: Group A1 with the tube current reduced to 20% of the normal tube current outside the pulsing window,and Group A2 with the tube current reduced to 4% of the normal tube current outside the pulsing window (MinDose).The image quality,noise,volume CT dose index (CTDIvol),and effective dose (E) of these two groups were evaluated.Results The mean score of imaging quality of Group A1 was (4.3 ± 0.3 ),not significantly different from that of Group A2 [(4.5 ±0.4),t=0.16,P＞0.05].The value of CTDIvol of Group A1 was (40.2 ±9.6) mGy,significantly higher than that of Group A2 [( 36.4 ± 9.1 ) mGy,t = 3.2,P ＜ 0.05].The E value of Group A1 was (9.1± 2.2) mSv ,significantly higher than that of A2 [( 8.1 ± 1.9) mSv,t = 2.7,P ＜ 0.05].Conclusion Application of the MinDose technique not only reduces the radiation dose to the patient,but also meets the requirement of diagnosis.

Application value of dose reduction techniques (MinDose) in dual-source CT coronary artery angiography

Objective To evaluate the radiation dose and image quality of MinDose techniques in dual-source CT coronary artery angiography.Methods 120 consecutive patients undergoing cardiac CT scans were randomly assigned into 2 groups: Group A1 with the tube current reduced to 20% of the normal tube current outside the pulsing window,and Group A2 with the tube current reduced to 4% of the normal tube current outside the pulsing window (MinDose).The image quality,noise,volume CT dose index (CTDIvol),and effective dose (E) of these two groups were evaluated.Results The mean score of imaging quality of Group A1 was (4.3 ± 0.3 ),not significantly different from that of Group A2 [(4.5 ±0.4),t=0.16,P＞0.05].The value of CTDIvol of Group A1 was (40.2 ±9.6) mGy,significantly higher than that of Group A2 [( 36.4 ± 9.1 ) mGy,t = 3.2,P ＜ 0.05].The E value of Group A1 was (9.1± 2.2) mSv ,significantly higher than that of A2 [( 8.1 ± 1.9) mSv,t = 2.7,P ＜ 0.05].Conclusion Application of the MinDose technique not only reduces the radiation dose to the patient,but also meets the requirement of diagnosis.