迭代线束硬化校正技术在降低头部CT扫描中后颅窝硬化伪影的价值研究  

Study on the Value of Iterative Beam Hardening Correction Technology in Reducing Beam Hardening Artifacts in the Posterior Cranial Fossa of Head CT Scanning

作　　者：刘明飞 刘玉强 潘宁 吴佳星 袁子龙[1] LIU Mingfei;LIU Yuqiang;PAN Ning(Department of Radiology,Hubei Cancer Hospital,Wuhan,Hubei Province 430079,P.R.China)

机构地区：[1]湖北省肿瘤医院放射科,武汉430079 [2]青岛大学附属青岛市海慈医院(青岛市中医医院),266000 [3]中南民族大学生物医学工程学院,武汉430074 [4]西门子医疗,上海200126

出　　处：《临床放射学杂志》2025年第2期367-371,共5页Journal of Clinical Radiology

基　　金：湖北陈孝平科技发展基金会青年科学专项基金资助项目(编号:CXPJJH123001-2338);湖北省重点研发计划资助项目(编号:2022BCA025)。

摘　　要：目的探讨迭代线束硬化校正(iBHC)技术在降低后颅窝CT图像线束硬化伪影中的价值。方法(1)体模实验:将9个不同碘浓度(含碘0~64 mg/ml)的试管置入体模内,分别使用管电压70~140 kV对体模进行扫描,并对应重建iBHC及非iBHC两组图像;针对不同试管之间的感兴趣区测量噪声值以及背景噪声,并计算图像的伪影指数(AI)。(2)临床实验:随机抽取25例头部CT扫描的病例,分别重建iBHC及非iBHC两组图像,对后颅窝区和同层面正常小脑区域进行测量并计算AI;并由两名影像科医师采用5分法对后颅窝CT图像进行评分。结果体模实验中,在不同管电压条件下,iBHC组相比非iBHC组的噪声、AI差异均具有统计学意义(t=8.106~5.668,P<0.001;t=8.598~4.856,P<0.001);且iBHC组噪声及AI较非iBHC组分别降低约38%~46%、46%~54%。在临床实验中,iBHC组与非iBHC组后颅窝区噪声、AI差异均具有统计学意义(t=29.984,P<0.001;t=26.908,P<0.001);iBHC组噪声、AI较非iBHC组分别降低60%及70%;iBHC组主观评分与非iBHC组主观评分差异具有统计学意义(Z=-8.638,P<0.001);iBHC组CT图像的可诊断率(100%)远高于非iBHC组(66%)。结论iBHC技术能显著降低头部CT扫描中后颅窝线束硬化伪影并提高图像质量。Objective To investigate the value of iterative beam hardening correction(iBHC)technology in reducing beam hardening artifacts in the posterior cranial fossa of head CT images.Methods(1)Phantom Experiment:Nine test tubes with varying iodine concentrations(0~64 mg/ml)were placed in a phantom.The phantom was scanned with tube voltages ranging from 70 to 140 kV.Images were reconstructed using both iBHC and non-iBHC methods.Noise levels and background noise in regions of interest between different test tubes were measured,and the artifact index(AI)of the images was calculated.(2)Clinical Experiment:Twenty-five cases of head CT scans were randomly selected.Images were reconstructed using both iBHC and non-iBHC methods.Measurements were taken in the posterior cranial fossa and the corresponding normal cerebellar region on the same plane to calculate the artifact index(AI).Two radiologists evaluated the posterior cranial fossa CT images using a 5-point scale.Results In the phantom experiment,under different tube voltage conditions,the differences in noise and AI between the iBHC group and the non-iBHC group were statistically significant(t=8.106–5.668,P<0.001;t=8.598–4.856,P<0.001).The iBHC group exhibited a reduction in noise and AI by approximately 38%–46%and 46%–54%,respectively,compared to the non-iBHC group.In the clinical experiment,the differences in noise and AI in the posterior cranial fossa between the iBHC and non-iBHC groups were statistically significant(t=29.984,P<0.001;t=26.908,P<0.001).The iBHC group showed a reduction in noise and AI by 60%and 70%,respectively,compared to the non-iBHC group.The subjective scores for the iBHC group were significantly different from those of the non-iBHC group(Z=-8.638,P<0.001).The diagnostic rate of CT images in the iBHC group(100%)was significantly higher than that of the non-iBHC group(66%).Conclusion The iBHC technology can significantly reduce beam hardening artifacts in the posterior cranial fossa of head CT scans and improve image quality.Its use in clinica

关 键 词：迭代线束硬化校正 线束硬化伪影 后颅窝 伪影指数 头部CT 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]