朱超楠 1田俊 1孙文路 1李前威 1万婷婷 1孙思阳1
作者信息
- 1. 南京医科大学第二附属医院 放射影像科,江苏 南京 210011
- 折叠
摘要
Abstract
Objective To explore the optimal combination of pre-and post-weights for adaptive statistical iterative reconstruction-V(ASIR-V)in cranial computed tomography(CT)examinations.Methods Ninety patients undergoing cranial CT plain scans were divided into groups A,B,and C(30 cases each)using the random number table method.Pre-ASIR-V weights of 20％,30％,and 40％were preset for groups A,B,and C before scanning,respectively.After scanning,image reconstruction was performed with post-ASIR-V weights of 50％,60％,70％,and 80％,yielding subgroups A5-A8,B5-B8,and C5-C8.Radiation dose parameters(DLP,CTDIvol),effective dose(ED),signal-to-noise ratio(SNR),and contrast-to-noise ratio(CNR)were recorded.Two radiologists conducted subjective image evaluation using a 5-point scale in a double-blinded manner.Results In objective evaluation,ED decreased linearly with increasing pre-ASIR-V weight(regression equation:y=-0.33x+2.71,r2=0.918,P<0.001).SNR and CNR in all subgroups increased with higher post-ASIR-V weights(P<0.001).Subjective scores showed a trend of first increasing then decreasing;subgroups A6,B7,and C7 had the highest scores at their respective pre-ASIR-V levels,with subgroup B7 scoring the highest overall.Conclusion At a noise index of 3 and tube voltage of 120 kV,using 30％pre-ASIR-V and 70％post-ASIR-V weights in cranial CT reduces noise,improves image quality,and significantly lowers patient radiation dose.关键词
CT/颅脑CT/自适应统计迭代重建算法(ASIR-V)/辐射剂量/图像质量Key words
computed tomography(CT)/cranial CT/adaptive statistical iterative reconstruction-V(ASIR-V)/radiation dose/image quality分类
医药卫生
