A Preliminary Study of Dual-source CT Coronary Angiography in Low Kilovoltage Setting

Objective To evaluate the feasibility of low tube voltage techniques in CT coronary angiography(CTCA) with dual-source CT(DSCT)scanner.Materials and Methods 60 patients undergoing CTCA were enrolled into this study,who were divided into conventional voltage group(120 kVp,A group,n=30)and low tube voltage group(100 kVp,B group,n=30).Image quality,contrast noise ratio(CNR),volume CT dose index(CTDIvol),and effective dose(ED) of two groups were evaluated respectively.Results The mean image quality score of RCA,LAD,and CX was 3.77±0.50,3.73±0.52,3.80±0.48 for group A and 3.50±0.63,3.53±0.60,3.50±0.57 for group B,respectively;the mean image CNR was 20.33±5.14 21.56±5.61 for group A and group B,respectively.There was no significant difference in the image quality score and the mean image noise between the two groups(t=-0.88,P0.05),the average CTDIvol in A group and B group was(62.24±10.12)mGy and(36.50±8.45)mGy,respectively(t=10.7,P0.05);and the mean ED was(17.63±3.75)mSv and(10.03±2.23)mSv,respectively(t=9.55,P0.05).Conclusion Low tube voltage CTCA can reduce radiation dose to the patient,and meet the demand of the clinic diagnosis.