Application of low tube voltage combined with low contrast agent in the neck CTA examination
10.3760/cma.j.issn.0254-5098.2014.11.021
- VernacularTitle:低管电压结合低对比剂量技术在颈部CTA检查中的应用
- Author:
Wei XIA
;
Xiaorui YIN
;
Yuan ZHOU
;
Zhijun WANG
;
Jingtao WU
- Publication Type:Journal Article
- Keywords:
Radiation dose;
Tomography;
Angiography;
Venous artifact
- From:
Chinese Journal of Radiological Medicine and Protection
2014;34(11):872-875
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the differences in image quality and radiation dose in the neck CTA between low tube voltage scanning method combined with exact calculation of contrast dosage and conventional scanning methods.Methods Ninety patients who had undergone neck CTA examination from October 2012 to June 2013 were prospectively selected to perform study.Patients were randomly divided into Group A,B and C,each with 30 cases.Tube voltage and contrast amount were,respectively,120 kV and 70-80 ml for Group A (conventional group),100 kV and exact calculation for Group B,80 kV and exact calculation for Group C.Using ANOVA test,radiation dose,contrast amount,CNR were statistically analyzed among three groups.Subjective evaluations were made of image quality by two experienced radiologists based on a 5-point system.Results The effective doses in Group B and C were (4.5 ± 0.7) mSv and (2.1 ± 0.4) mSv,respectively,significantly lower than (6.6 ± 0.9) mSv in Group A,with statistically significant difference(F =72.4,P ＜ 0.05).The amounts of contrast were significantly lower in Group B and C than that in Group A,which respectively were (73.2 ± 8.2) ml for Group A and (48.2 ± 5.1) for Group B and (48.6 ± 5.4) ml for Group C,with statistically significant difference (F =56.8,P ＜ 0.05).CNRs increased respectively by 42.2％ in Group B and by 42.2％ in Group C compared with Group A,with statistically significant difference (F =72.6,P ＜ 0.05).Venous artifact images were found in 10 patients of Group A,having different effects on image quality,whereas in Group B and C,there were not vein artifacts to found.Conclusions The low tube voltage (80 kV) scanning method combined with exact calculation of contrast features not only significantly lower radiation dose and lower contrast amount used,but also improved image quality in comparison with conventional method.
