Effect of Low Contrast Dose and Low Tube Voltage Combined with Adaptive Statistical Iterative Reconstruction in the Image Quality of Abdominal CT Angiography
10.3969/j.issn.1005-5185.2015.04.005
- VernacularTitle:低浓度对比剂和低管电压结合适应性统计迭代技术对腹部动脉血管成像质量的影响
- Author:
Tingting LV
;
Ailian LIU
;
Heqing WANG
;
Shifeng TIAN
;
Jinghong LIU
;
Yijun LIU
- Publication Type:Journal Article
- Keywords:
Aorta,abdominal;
Renal artery;
Splenic artery;
Hepatic artery;
Mesenteric artery,superior;
Tomography,X-ray computed;
Angiography;
Statistical iterative reconstruction;
Contrast media;
Radiation dosage
- From:
Chinese Journal of Medical Imaging
2015;(4):260-263
- CountryChina
- Language:Chinese
-
Abstract:
Purpose To investigate the effect of low contrast dose and low tube voltage combined with adaptive statistical iterative reconstruction (ASIR) on image quality of abdominal CT angiography. Materials and Methods 139 patients with body mass index (BMI) <22 kg/m2 who were supposed to undergo abdominal dynamic contrast-enhanced examination were prospectively enrolled and randomly divided into group A with 78 cases (80 kVp tube voltage +50% ASIR, contrast agent concentration 270 mgI/ml) and group B with 61 cases (120 kVp tube voltage, contrast agent concentration 350 mgI/ml). Subjective score of right renal artery image quality of the two groups were evaluated and the coefficient between them was tested; CT dose index of volume (CTDIvol), CT values of abdominal aorta and its branches, and the right side erector spinae, contrast-to-noise ratio (CNR) of the vessel, the right erector spinae image noise (SD), and the total amount of iodine were also compared between the two groups. Results The inter observer agreement for subjective scores were very good (Kappa value>0.80) in both groups, the subjective score of group A and group B were 4.60±0.51 and 3.81±0.76, respectively, and the difference was statistically significant (Z= - 6.86, P<0.05). CTDIvol of group A and group B were (5.56±4.21) mGy and (7.11±1.54) mGy, respectively, the difference was statistically significant (t= - 9.89, P<0.01); CT values of the arteries in both groups were all greater than 400 HU; CT values and the CNR of the abdominal aortic trunk and branches in group A were higher than those of group B (P<0.05); there was no statistically significant difference of image noise between the two groups (P>0.05). The total amount of iodine dose in group A and group B was 270 mg and 350 mg respectively, with a 22.86% reduce of the total iodine for each patient in A group than in B group. Conclusion For patients with BMI<22 kg/m2, it is feasible to use low dose contrast medium with low tube voltage and ASIR, which may not only improve the image quality of abdominal CTA but also reduce the radiation dose and iodine content.
