Preliminary study of peripheral artery CT angiography with auto-tube current of different tube voltage and noise index
10.3969/j.issn.1002-1671.2015.09.033
- VernacularTitle:自动管电流调节下不同管电压及噪声指数行下肢 CTA 的初步研究
- Author:
Xiaoying ZHAO
;
Xingwang WU
;
Bin LIU
- Publication Type:Journal Article
- Keywords:
low tube voltage;
noise index;
radiation dose;
computed tomography;
angiography;
auromated tube current modulation techique
- From:
Journal of Practical Radiology
2015;(9):1531-1534
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the effect of different tube voltage and noise index (NI)on image quality and radiation dose during peripheral artery CTA with automatic tube current modulation(ATCM)technique.Methods Seventy-two patients were ran-domly divided into three groups with different scanning tube voltage and noise index as follows:group A with 100 kV and NI of 1 5, group B with 80 kV and NI of 1 5,group C with 100 kV and NI of 20.Image quality,segmental vascular enhancement,signal-to-noise ratio (SNR),contrast-to-noise (CNR)and effective dose (ED)were independently evaluated in 3 groups.The methods of sta-tistics analysis were ANOVA,and P <0.05 represented the significant difference.Results There was no significant difference of image quality of the peripheral artery among 3 groups.The CT value,SNR,CNR in group B (80 kV)was the highest,and there were statistical differences between A,B groups and B,C groups of arteries (P <0.05),and there was no satistiacal difference between A group and C group.Compared with group A and group B,the CTDlvol,DLP and ED of group C was reduced 50.45%,51.20%,51.21% and 35.03%,34.91%,34.92%,respectively,and the difference was statistical significance (P < 0.05 ),and there was no significant difference between group A and group B (P >0.05).Conclusion Using ATCM low-kV with high NI scanning can reduce radiation dose without interference on image quality for peripheral artery CTA.
