Iodine concentration, HU accuracy, and metal artifacts evaluation on second-generation dual-layer spectral detector CT images with metal implants: a phantom study.

IF 1.1 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Acta radiologica Pub Date : 2024-09-01 Epub Date: 2024-08-14 DOI:10.1177/02841851241269853
Xinming Zhang, Hanwei Li, Haowen Wang, Xiaomin Liu, Weiwei Deng, Jianqiu Zhong, Litian Fan, Qingqing Ling, Debin Hu, Hongliang Qi, Hongwen Chen
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Abstract

Background: Metal implants may affect the image quality, iodine concentration (IC), and CT Hounsfield unit (HU) quantification accuracy.

Purpose: To investigate the quantitative accuracy of IC and HU from dual-layer spectral detector (DLCT) in the presence of metal artifacts.

Material and methods: An experimental cylindrical phantom containing eight iodine inserts and two metal inserts was designed. The phantom underwent scanning at three radiation dose levels and two tube voltage settings. A set of conventional images (CIs), virtual monoenergetic images (VMIs), and iodine concentration maps (ICMs) were generated and measured for all the eight iodine inserts. Quantitative indicators of mean absolute percentage error (MAPE), artifact index (AI), contrast-to-noise ratio (CNR), signal-to-noise ratio (SNR), and standard deviation (SD) on CIs and VMIs were calculated for IC and HU. Subjective score evaluation was also conducted.

Results: The MAPEiodine values of all regions of interest across different scanning configurations were all <5%. Almost all APEiodine values were <5%, indicating that metal artifacts had little impact on IC measurements. When the tube voltage was fixed, the SD value of attenuation decreased with the increase of the tube current; this is also true when the tube current was fixed. The middle energy reconstructions seemed to give a good balance between reducing artifacts and improving contrast.

Conclusion: VMIs from DLCT can reduce metal artifacts, the accuracy of IC quantification is not sensitive to imaging parameters. In summary, metal implants exhibit minimal impact on image quality and IC quantification accuracy in reconstructed images from DLCT.

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带金属植入物的第二代双层光谱探测器 CT 图像的碘浓度、HU 精确度和金属伪影评估:一项模型研究。
背景:目的:研究双层光谱探测器(DLCT)在金属伪影存在的情况下,碘浓度(IC)和CT Hounsfield单位(HU)定量的准确性:设计了一个包含八个碘插入物和两个金属插入物的圆柱形实验模型。该模型在三种辐射剂量水平和两种管电压设置下进行扫描。为所有八个碘插入物生成并测量了一组常规图像(CI)、虚拟单能图像(VMI)和碘浓度图(ICM)。计算了 IC 和 HU 的平均绝对百分比误差 (MAPE)、伪影指数 (AI)、对比度与噪声比 (CNR)、信噪比 (SNR) 以及 CI 和 VMI 的标准偏差 (SD) 等定量指标。同时还进行了主观评分评估:不同扫描配置下所有感兴趣区的 MAPE 碘值均为结论:DLCT 的 VMI 可以减少金属伪影,IC 定量的准确性对成像参数并不敏感。总之,在 DLCT 重建图像中,金属植入物对图像质量和 IC 定量准确性的影响微乎其微。
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来源期刊
Acta radiologica
Acta radiologica 医学-核医学
CiteScore
2.70
自引率
0.00%
发文量
170
审稿时长
3-8 weeks
期刊介绍: Acta Radiologica publishes articles on all aspects of radiology, from clinical radiology to experimental work. It is known for articles based on experimental work and contrast media research, giving priority to scientific original papers. The distinguished international editorial board also invite review articles, short communications and technical and instrumental notes.
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