Feasibility of low radiation dose in craniocervical artery CT angiography with automatic tube current modulation
- VernacularTitle:自动管电流模式在头颈部动脉CT造影使用低剂量射线的可行性
- Author:
Qinghai YUAN
;
Jianhua LIU
;
Bin SONG
;
Tingting GONG
- Publication Type:Journal Article
- Keywords:
Tomography,X-Ray Computed;
Radiation Dose;
Signal-Noise-Ratio;
Contrast-Noise-Ratio
- From:
Chinese Journal of General Surgery
2001;0(08):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the feasibility of automatic tube current modulation(ATCM) in craniocervical artery CT angiography with 256-slice CT,while maintaining the image quality.Methods Sixty patients undergoing craniocervical artery CTA were enrolled into this study,and were divided into conventional tube current group(250 mAs,group A,n=30) and low tube current group(ATCM,group B,n=30).The signal-to-noise ratio(SNR),contrast-to noise ratio(CNR),volume CT dose index(CTDIvol) and effective dose(ED) were evaluated respectively.Results The mean image SNR was(37.47?9.39) and(36.85?7.96) for group A and group B respectively,and was not significantly different(P=0.79).The mean image CNR was(32.13?9.06) and(31.86?7.66) for group A and group B respectively,and was not significantly different(P=0.90).The CT volume dose index(CTDI) was 16.5 mGy and 410.55?0.94mGy for group A and group B respectively,and was significantly different(P
