联合人工智能模型迭代重建和80 kV管电压降低腹部增强CT辐射剂量  

Radiation dose reduction of abdominal enhanced CT using artificial intelligence model-based iterative reconstruction combined with 80kV tube voltage setting

作　　者：曹建新 朱卓 陈颖[1,2] 李嘉帅 张清 CAO Jian-xin;ZHU Zhuo;CHEN Ying(Department of Radiology,Puren Hospital Affiliated to Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学附属普仁医院放射科,武汉430081 [2]武汉市普仁医院放射科,武汉430081

出　　处：《放射学实践》2024年第10期1381-1386,共6页Radiologic Practice

基　　金：武汉科技大学职业危害识别与控制湖北省重点实验室开放基金项目(OHIC2021G04)。

摘　　要：目的:探讨联合人工智能模型迭代重建(AIIR)和80 kV管电压降低腹部增强CT辐射剂量的应用价值。方法:120例行腹部增强CT的患者分成A(标准剂量组)、B(低剂量组)两组。A组采用120 kV管电压及混合迭代重建(HIR),B组采用80 kV管电压及HIR和AIIR。评估A、B两组的辐射剂量,并评估A组HIR图像、B组HIR图像和AIIR图像上肝组织、腹主动脉、腰大肌、髂腰肌、门静脉主干噪声以及肝组织、肝动脉及门静脉信噪比(SNR)。两位医师采用盲法按5分法对图像质量进行主观评分(5分为优秀;1分为差)。结果:A、B两组有效辐射剂量分别为(11.3±1.9)mSv和(5.0±0.7)mSv;与A组相比,B组辐射剂量下降55.8%(P<0.001)。在动脉期,A组HIR图像上肝组织、腹主动脉、腰大肌及髂腰肌噪声分别为(12.1±1.3)HU、(13.9±2.2)HU、(13.3±1.9)HU和(12.5±2.0)HU,B组HIR图像上相应数值分别为(14.9±1.8)HU、(18.3±2.8)HU、(17.1±2.6)HU和(15.2±2.7)HU,B组AIIR图像上的相应数值分别为(7.9±0.8)HU、(9.1±1.4)HU、(8.7±1.6)HU和(8.7±2.2)HU;在静脉期,A组HIR图像上肝组织及门静脉主干噪声分别为(13.0±1.9)HU和(14.1±2.3)HU,B组HIR图像相应数值分别为(15.5±2.4)HU和(17.7±2.9)HU,B组AIIR图像上相应数值分别为(8.3±0.9)HU和(9.3±2.0)HU;A组HIR图像上动脉期肝组织、腹主动脉、静脉期肝组织和门静脉主干SNR分别为5.2±0.8、25.0±5.7、8.6±1.5和11.3±2.1,B组HIR图像上相应数值分别为4.6±0.7、29.2±6.6、8.7±1.7和11.0±2.3,B组AIIR图像上对应数值分别为8.5±0.9、58.5±11.8、16.1±2.6和21.9±4.1;与B组和A组HIR图像相比,B组AIIR图像上肝组织、腹主动脉、腰大肌、髂腰肌及门静脉主干噪声明显下降(P<0.001),而肝组织、腹主动脉及门静脉SNR显著提升(P<0.001)。医师1对动脉期A组HIR图像、B组HIR图像和AIIR图像的主观评分分别为4.42±0.53、3.48±0.50和4.87±0.34,静脉期相应数值分别为4.23±0.56、3.40±0.49和4.92±0.28;医师2对动脉Objective:To explore the practical application and effectiveness of reducing radiation dose in abdominal enhanced CT scans using artificial intelligence model-based iterative reconstruction(AIIR)combined with an 80kV tube voltage setting.Methods:This study included a total of 120 patients who underwent abdominal enhanced CT scans.The patients were divided into two groups:group A(standard-dose group)and group B(low-dose group).Group A underwent scans with 120kV tube voltage and hybrid iterative reconstruction(HIR),while group B had scans using 80kV tube voltage,HIR,and AIIR.The radiation dose was evaluated for both groups,and the noise of liver tissue,abdominal aorta,psoas major muscle,iliopsoas,and the main portal vein was evaluated for the HIR images in group A and for both HIR and AIIR images in group B.Signal-to-noise ratios(SNRs)of liver tissue,abdominal aorta,and main portal vein were evaluated for the HIR images in group A and for both HIR and AIIR images in group B.Image quality was graded by two blinded radiologists on a 5-point scale(5=excellent;1=poor).Results:The results showed that the effective doses in group A and group B were(11.3±1.9)mSv and(5.0±0.7)mSv,respectively.The radiation dose was reduced by 55.8%in group B compared to group A(P<0.001).In the arterial phase,the noise of liver tissue,abdominal aorta,psoas major muscle,and iliopsoas was(12.1±1.3)HU,(13.9±2.2)HU,(13.3±1.9)HU,and(12.5±2.0)HU on the HIR images in group A,(14.9±1.8)HU,(18.3±2.8)HU,(17.1±2.6)HU,and(15.2±2.7)HU on the HIR images in group B,and(7.9±0.8)HU,(9.1±1.4)HU,(8.7±1.6)HU,and(8.7±2.2)HU on the AIIR images in group B,respectively.In the venous phase,the noise of liver tissue and the main portal vein was(13.0±1.9)HU and(14.1±2.3)HU on the HIR images in group A,(15.5±2.4)HU and(17.7±2.9)HU on the HIR images in group B,and(8.3±0.9)HU and(9.3±2.0)HU on the AIIR images in group B,respectively.The SNRs of liver tissue in the arterial phase,abdominal aorta,liver tissue in the venous phase,and main portal vein wer

关 键 词：人工智能 图像处理 计算机辅助 图像增强 辐射剂量 体层摄影术 X线计算机 

分 类 号：R-05[医药卫生] R814.3R814.4R814R144