Preliminary research of reducing radiation dose In aortic CT angiography with 80 kV tube kilovoltage
10.3760/cma.j.issn.0254-5098.2010.06.030
- VernacularTitle:应用80 kV管电压降低主动脉CT造影射线剂量初烫
- Author:
Qinghai YUAN
;
Jianhua LIU
;
Ring HAN
;
Zhe YANG
;
Tingting GONG
- Publication Type:Journal Article
- Keywords:
Tomography;
X-ray computer;
Radiation dose;
Signal-noise-ratio;
Contrastnoise-ratio
- From:
Chinese Journal of Radiological Medicine and Protection
2010;30(6):740-743
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the feasibility of 80 kV tube kilovoltage in aortic artery CT angiography with 256-slice CT. Methods A total of 62 patients undergoing aortic artery CTA were enrolled into this study and divided into conventional tube kilovoltage (120 kV, n = 31 ) and low tube kilovoltage (80 kV, n = 31 ). The signal-to-noise ratio (SNR) , contrast-to-noise ratio (CNR), volume CT dose index (CTDIvol) and effective dose (E) were evaluated, respectively. Results The mean image SNR was ( 35.92 ± 5.04) and ( 33.95 ± 8. 30) for conventional tube kilovoltage and low tube kilovoltage,respectively, with no significant difference (t = 1. 131, P =0. 263). The mean image CNR was (30. 32 ±4.78) and (28.71 ± 7.96 ) for conventional tube kilovoltage and low tube kilovoltage, respectively, with no significant difference ( t = 0. 964, P = 0. 339 ). The average effective dose ( E ) was ( 14. 28 ± 0.96 )mSv and (9. 72± 0. 81 )mSv for conventional tube kilovoltage and low tube kilovoltage, respectively, with significant difference ( t = 20. 12, P ＜ 0. 001 ). Conclusions 80 kV tube kilovoltage aortic artery CTA can reduce radiation dose by 31.9% , and contrast dose 50% ,and maintain image quality compared with 120 kV tube kilovoltage.
