Carlos A. Reynoso-Mejia, Jonathan Troville, Martin G. Wagner, Bernice Hoppel, Fred T. Lee, Timothy P. Szczykutowicz
{"title":"使用银滤波器减少介入 CT 程序中的针状伪影","authors":"Carlos A. Reynoso-Mejia, Jonathan Troville, Martin G. Wagner, Bernice Hoppel, Fred T. Lee, Timothy P. Szczykutowicz","doi":"10.1186/s42490-024-00076-y","DOIUrl":null,"url":null,"abstract":"MAR algorithms have not been productized in interventional imaging because they are too time-consuming. Application of a beam hardening filter can mitigate metal artifacts and doesn’t increase computational burden. We evaluate the ability to reduce metal artifacts of a 0.5 mm silver (Ag) additional filter in a Multidetector Computed Tomography (MDCT) scanner during CT-guided biopsy procedures. A biopsy needle was positioned inside the lung field of an anthropomorphic phantom (Lungman, Kyoto Kagaku, Kyoto, Japan). CT acquisitions were performed with beam energies of 100 kV, 120 kV, 135 kV, and 120 kV with the Ag filter and reconstructed using a filtered back projection algorithm. For each measurement, the CTDIvol was kept constant at 1 mGy. Quantitative profiles placed in three regions of the artifact (needle, needle tip, and trajectory artifacts) were used to obtain metrics (FWHM, FWTM, width at − 100 HU, and absolute error in HU) to evaluate the blooming artifact, artifact width, change in CT number, and artifact range. An image quality analysis was carried out through image noise measurement. A one-way analysis of variance (ANOVA) test was used to find significant differences between the conventional CT beam energies and the Ag filtered 120 kV beam. The 120 kV-Ag is shown to have the shortest range of artifacts compared to the other beam energies. For needle tip and trajectory artifacts, a significant reduction of − 53.6% (p < 0.001) and − 48.7% (p < 0.001) in the drop of the CT number was found, respectively, in comparison with the reference beam of 120 kV as well as a significant decrease of up to − 34.7% in the artifact width (width at − 100 HU, p < 0.001). Also, a significant reduction in the blooming artifact of − 14.2% (FWHM, p < 0.001) and − 53.3% (FWTM, p < 0.001) was found in the needle artifact. No significant changes (p > 0.05) in image noise between the conventional energies and the 120 kV-Ag were found. A 0.5 mm Ag additional MDCT filter demonstrated consistent metal artifact reduction generated by the biopsy needle. This reduction may lead to a better depiction of the target and surrounding structures while maintaining image quality.","PeriodicalId":72425,"journal":{"name":"BMC biomedical engineering","volume":"24 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Needle artifact reduction during interventional CT procedures using a silver filter\",\"authors\":\"Carlos A. Reynoso-Mejia, Jonathan Troville, Martin G. Wagner, Bernice Hoppel, Fred T. Lee, Timothy P. 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引用次数: 0
摘要
由于 MAR 算法过于耗时,因此尚未在介入成像中实现产品化。应用光束硬化滤波器可以减少金属伪影,而且不会增加计算负担。我们评估了 0.5 毫米银(Ag)附加滤波器在多载体计算机断层扫描(MDCT)扫描仪上进行 CT 引导活检过程中减少金属伪影的能力。活检针被放置在一个拟人化模型(Lungman,日本京都 Kagaku 公司)的肺野内。CT 采集在 100 kV、120 kV、135 kV 和 120 kV 的光束能量和 Ag 滤波器下进行,并使用滤波背投影算法进行重建。每次测量时,CTDIvol 都保持在 1 mGy。在伪影的三个区域(针、针尖和轨迹伪影)放置定量剖面图,以获得度量指标(FWHM、FWTM、- 100 HU 时的宽度和 HU 绝对误差),从而评估开花伪影、伪影宽度、CT 数变化和伪影范围。通过图像噪声测量进行图像质量分析。采用单因素方差分析(ANOVA)检验来发现传统 CT 光束能量与经过 Ag 滤波的 120 kV 光束之间的显著差异。结果表明,与其他光束能量相比,120 kV-Ag光束的伪影范围最短。在针尖和轨迹伪影方面,传统能量与 120 kV-Ag 相比,图像噪声显著降低了 - 53.6% (p 0.05)。0.5 毫米银质附加 MDCT 过滤器显示,活检针产生的金属伪影持续减少。这种减少可能会在保持图像质量的同时更好地描述目标和周围结构。
Needle artifact reduction during interventional CT procedures using a silver filter
MAR algorithms have not been productized in interventional imaging because they are too time-consuming. Application of a beam hardening filter can mitigate metal artifacts and doesn’t increase computational burden. We evaluate the ability to reduce metal artifacts of a 0.5 mm silver (Ag) additional filter in a Multidetector Computed Tomography (MDCT) scanner during CT-guided biopsy procedures. A biopsy needle was positioned inside the lung field of an anthropomorphic phantom (Lungman, Kyoto Kagaku, Kyoto, Japan). CT acquisitions were performed with beam energies of 100 kV, 120 kV, 135 kV, and 120 kV with the Ag filter and reconstructed using a filtered back projection algorithm. For each measurement, the CTDIvol was kept constant at 1 mGy. Quantitative profiles placed in three regions of the artifact (needle, needle tip, and trajectory artifacts) were used to obtain metrics (FWHM, FWTM, width at − 100 HU, and absolute error in HU) to evaluate the blooming artifact, artifact width, change in CT number, and artifact range. An image quality analysis was carried out through image noise measurement. A one-way analysis of variance (ANOVA) test was used to find significant differences between the conventional CT beam energies and the Ag filtered 120 kV beam. The 120 kV-Ag is shown to have the shortest range of artifacts compared to the other beam energies. For needle tip and trajectory artifacts, a significant reduction of − 53.6% (p < 0.001) and − 48.7% (p < 0.001) in the drop of the CT number was found, respectively, in comparison with the reference beam of 120 kV as well as a significant decrease of up to − 34.7% in the artifact width (width at − 100 HU, p < 0.001). Also, a significant reduction in the blooming artifact of − 14.2% (FWHM, p < 0.001) and − 53.3% (FWTM, p < 0.001) was found in the needle artifact. No significant changes (p > 0.05) in image noise between the conventional energies and the 120 kV-Ag were found. A 0.5 mm Ag additional MDCT filter demonstrated consistent metal artifact reduction generated by the biopsy needle. This reduction may lead to a better depiction of the target and surrounding structures while maintaining image quality.