宝石能谱CT在去金属伪影技术最佳单能量的再研究

发布时间：2018-07-31 11:29

【摘要】：目的:常规CT图像中金属植入物会引起伪影,对局部结构组织的判断有严重影响,使CT图像的解读能力下降,难以达到临床医疗诊断的目的。因此,需要有效的方法从图像域或投影域进行校正。方法:通过对金属植入物术后常规混合能量与最佳单能量成像上的图像质量及参数比较,联合能谱CT金属伪影去除系统(MARs)重建技术的综合运用,探讨宝石能谱CT扫描技术在去金属伪影方面的独到优势和临床应用的价值。结果:重组图像时,所有常规混合能量图像均有明显的金属伪影。经能谱CT的MARs重建后伪影明显减少。金属植入物后QC组、mono+MRAs组伪影最重层面的CT均值(HU)、SD均值比较均有统计学差异(P0.05)。而且在mono+MRAs组,当单能量在90~140 kev时,伪影最重层面的CT均值(HU)、SD均值及伪影指数AI的变化曲线趋于稳定。结论:宝石能谱CT去金属伪影的重建技术选择单能量在90~140 kev之间,可大大减少金属植入物造成的伪影,在临床诊断及疾病随访方面具有较大应用价值。
[Abstract]:Objective: metal implants in conventional CT images can cause artifacts, which have a serious impact on the judgment of local structure and tissue, so that the interpretation ability of CT images is decreased, and it is difficult to achieve the purpose of clinical medical diagnosis. Therefore, an effective method is needed for correction from image domain or projection domain. Methods: by comparing the image quality and parameters of conventional mixed energy and optimal single energy imaging after metal implants, the combined energy spectrum CT metal artifact removal system (MARs) reconstruction technique was used. To explore the unique advantages and clinical application value of gem energy spectrum CT scanning technique in demetallization artifact. Results: metal artifacts were observed in all conventional mixed energy images. The artifacts were significantly reduced after MARs reconstruction by energy dispersive CT. Moreover, in the mono MRAs group, when the single energy was 90 ~ 140 kev, the curve of (HU) mean (HU) SD mean and artifact index AI in the gravest plane of the artifact tended to be stable. Conclusion: the reconstruction technique of gem energy spectrum CT for removing metal artifacts can greatly reduce the artifacts caused by metal implants by selecting a single energy range of 90 ~ 140 kev, and has great application value in clinical diagnosis and disease follow-up.
【作者单位】：宁夏医科大学;宁夏医科大学总医院心脑血管病医院;宁夏医科大学总医院;
【基金】：宁夏回族自治区科技攻关项目
【分类号】：R814

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