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对动脉期相应图像评分分别为4.40±0.53、3.47±0.54和4.88±0.32,静脉期相应数值分别为4.23±0.56、3.40±0.53和4.95±0.22;B组AIIR图像评分显著高于B组和A组HIR图像(P＜0.001).结论:联合人工智能模型迭代重建(AIIR)和80 kV管电压能够显著降低腹部增强CT辐射剂量,且低剂量AIIR图像质量明显优于常规剂量HIR图像.
Abstract
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 pa-tients 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,abdom-inal 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 a-orta,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 were 5.2±0.8,25.0±5.7,8.6±1.5,and 11.3±2.1 on the HIR images in group A,4.6±0.7,29.2±6.6,8.7±1.7,and 11.0±2.3 on the HIR images in group B,and 8.5±0.9,58.5±11.8,16.1±2.6,and 21.9±4.1 on the AIIR images in group B,respectively.Compared to the HIR images in group A and B,the noise of liver tissue,abdominal aorta,psoas major muscle,iliopsoas,and main portal vein on the AIIR images in group B was significantly decreased(P＜0.001),while the SNRs of the liver tissue,abdomi-nal aorta,and main portal vein on the AIIR images in group B were significantly increased(P＜0.001).The scores of the HIR images in group A,HIR images in group B,and AIIR images in group B were 4.42±0.53,3.48±0.50,and 4.87±0.34 in the arterial phase and 4.23±0.56,3.40±0.49,and 4.92±0.28 in the venous phase for radiologist 1,respectively,and 4.40±0.53,3.47±0.54,and 4.88±0.32 in the arterial phase and 4.23±0.56,3.40±0.53,and 4.95±0.22 in the venous phase for radiologist 2,respectively.The scores of the AIIR images in group B were significantly higher than those of the HIR images in group A and B(P＜0.001).Conclusion:This study showed a significant re-duction in radiation dose in the abdominal enhanced CT scans when using AIIR combined with 80kV tube voltage,compared to HIR and 120kV tube voltage.Additionally,the image quality of the AIIR images was found to be better than that of HIR images using standard radiation dose.Therefore,AIIR combined with 80kV tube voltage can be a useful method for reducing the radiation dose while maintai-ning the quality of the image.
基金项目
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)
维普
万方数据