Application of adaptive statistical iterative reconstruction in renal CTA with low-dose contrast medium
GUO Chang-yi1, HAN Dong2, YANG Chuang-bo2, LEI Yu-xin2, HE Tai-ping2, ZHANG Xi-rong3
1. Department of Radiology, the Second Affiliated Hospital of Shaanxi University of Chinese Medicine, Xianyang Shaanxi 712000, China;
2. Department of Radiology, Affiliated Hospital of Shaanxi University of Chinese Medicine, Xianyang Shaanxi 712000, China;
3. Department of Medical Techniques, Shaanxi University of Chinese Medicine, Xianyang Shaanxi 712000, China
Abstract:Objective: To evaluate the application value of adaptive statistical iterative reconstruction(ASIR) in reducing the dosage of CTA contrast agent in renal artery. Methods: Forty patients with renal artery CTA were randomly divided into two groups: routine group 20 cases(group A) with 600 mgI/kg and low contrast medium dose group 20 cases(group B) with 300 mgI/kg. The scan protocol was: Discovery CT750HD, smart mA, noise index of 10 HU, pitch 1.375:1, rotating speed 0.6 s/r. Images of the artery phase were reconstructed at 0.625 mm thickness with 40%ASIR, group A reconstructed monochromatic images at 70 keV, group B reconstructed monochromatic images from 40~70 keV by interval 5 keV. The CT values and standard deviation(SD) values of the renal artery in plain scan(CT1, SD1) and the arterial phase(CT2, SD2), and the erector muscle of spine in the arterial phase(CT3, SD3) were measured. The enhancement degree of the renal artery(ΔCT=CT2-CT1), the signal to noise ratio(SNR=CT2/SD2) and contrast to noise ratio(CNR=(CT2-CT3)/SD3) were calculated. Single factor analysis of variance was used. The subjective image scores of the groups were assessed blindly by two experienced physicians using a 5-point system and the score consistency was compared by the Kappa test. Results: The subjective scores of the 600 mgI/kg 70 keV group and the 300 mgI/kg 45 keV group were 3.90±0.55 and 4.00±0.65, 3.55±0.83 and 3.70±0.80, and the difference was not statistically significant(P>0.05), and there was no significant difference in the objective parameters(ΔCT, SNR and CNR)(P>0.05). Conclusion: When the dosage of contrast medium is reduced by 50%, the ASIR can get the image quality satisfying the diagnosis in the renal artery CTA.
郭长义1,韩 冬2,杨创勃2,雷雨欣2,贺太平2,张喜荣3. 自适应迭代重建算法在低对比剂肾动脉CTA扫描中的应用[J]. 中国临床医学影像杂志, 2018, 29(10): 713-716.
GUO Chang-yi1, HAN Dong2, YANG Chuang-bo2, LEI Yu-xin2, HE Tai-ping2, ZHANG Xi-rong3. Application of adaptive statistical iterative reconstruction in renal CTA with low-dose contrast medium. JOURNAL OF CHINA MEDICAL IMAGING, 2018, 29(10): 713-716.
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