The Optimal Combination of Monochromatic and Metal Artifact Reconstruction Dual-energy CT to Evaluate Total Knee Replacement Arthroplasty

Kim, Ji‐Hwan; Park, Chankue; Jeong, Hee Seok; Song, You Seon; Lee, In Sook; Jung, Yunsub; Lee, Sang Min

doi:10.1016/j.ejrad.2020.109254

Cited by 8 publications

(18 citation statements)

References 24 publications

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“…We applied 140 keV with MAR images among the DECT images based on a previous study. 11 The readers measured the rotation with a bone window setting (width: 3,000, level: 400). The images for the same patient were evaluated more than 2 weeks apart to decrease recall bias.…”

Section: Measurement Of Femoral Component Rotationmentioning

confidence: 99%

“…9 Until now, the femoral component in TKA has been difficult to evaluate with conventional CT because of severe metal artifacts due to the relatively large and complex shape of the prosthesis relative to the anatomy. However, recently, Kim et al 11 reported that the combination of virtual monochromatic images and projection-based MAR technique (DECT with MAR) enables evaluation of periprosthetic soft tissue as well as the bone in patients with TKA.…”

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confidence: 99%

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Metal Artifact Reduction Dual-Energy CT as an Accurate and Reliable Method for Measuring Total Knee Arthroplasty Femoral Component Rotation Compared to Conventional CT

et al. 2022

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This article determines the accuracy and reliability of dual-energy computed tomography (DECT) with metal artifact reduction (MAR) in the evaluation of femoral component rotation after total knee arthroplasty (TKA), in comparison with conventional CT images. A total of 49 patients (mean age, 69 years; 42 women) who underwent TKA between January 2019 and March 2020 were retrospectively enrolled. Femoral component rotation, including the anatomic and surgical transepicondylar axes, was evaluated with preoperative conventional CT and postoperative conventional CT and DECT with MAR. Surgical femoral component rotation was also assessed as a reference standard. Accuracy was assessed using paired t-test, and inter- and intraobserver reliability using intraclass correlation coefficients (ICCs) based on postoperative conventional CT and DECT with MAR. Clinical outcomes were evaluated using the Knee Society objective and functional scores. Accuracy of femoral component rotation was not significantly different from that of surgical rotation with both conventional CT and DECT with MAR. However, inter- and intraobserver reliability were better for DECT with MAR (ICC: 0.953–0.966) than for conventional CT (ICC: 0.641–0.749). The Knee Society objective and functional scores improved 1 year postoperatively. Conclusion DECT with MAR showed accurate and more reliable results than did conventional CT in the evaluation of femoral component rotation after TKA.

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Section: Measurement Of Femoral Component Rotationmentioning

confidence: 99%

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confidence: 99%

Metal Artifact Reduction Dual-Energy CT as an Accurate and Reliable Method for Measuring Total Knee Arthroplasty Femoral Component Rotation Compared to Conventional CT

et al. 2022

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“…For our subjective evaluation, all images of these 31 patients were anonymized, randomized, and presented to 2 radiologists with 5 and 11 years of experience, respectively. All images, including axial, coronal, sagittal, and 3D VR images, were comprehensively scored using a 4-point scale to evaluate the influence of metal artifacts: 4, no metal artifact affecting the diagnosis; 3, mild metal artifacts but enough to distinguish the boundary and shape of surrounding structures, do not interfere with diagnostic decisions; 2, moderate metal artifacts covering the boundary and shape of surrounding structures, but the boundary or structure of the metal prosthesis is visually measurable, barely meeting the diagnostic requirements; and 1, severe metal artifacts that obscure the boundary and shape of the surrounding structure, and deter accurate diagnosis (17). Before the subjective evaluation, the 2 observers were trained with 5 unrelated cases (not included in this study) to ensure that the evaluation criteria were as consistent as possible.…”

Section: Subjective Image Analysismentioning

confidence: 99%

“…The calculation process of SSIM is relatively complex, which is briefly described as below (17,18). In the case ( )…”

Section: Objective Image Analysismentioning

confidence: 99%

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Application of metal artifact reduction software in gemstone spectral computed tomography for patients after total knee arthroplasty

Zhang¹,

Wang²,

Zhao³

et al. 2022

Ann Transl Med

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Background: To explore the feasibility and effectiveness of the metal artifact reduction software (MARs) reconstruction algorithm in reducing metal artifacts of knee prostheses and to explore the optimal monochromatic level of virtual monochromatic spectral (VMS) images for artifact reduction to provide highquality images and reliable diagnosis in patients after total knee arthroplasty (TKA).Methods: A total of 31 patients underwent gemstone spectral computed tomography. VMS images with MARs and without MARs were obtained at different energy levels (80, 100, 120, and 140 keV). Two observers scored each group of images, and interobserver agreement was evaluated. Artificial indices (AIs), percentage500HU and structural similarity index measure (SSIM) values were calculated in the objective analysis to evaluate the image quality and impact of metal artifacts. Results:The consistency of the scores of the 2 observers was good (kappa value =0.78), and the score of the VMS images with MARs was higher than that of VMS images without MARs. AI values and percentage 500HU of the MARs group were significantly lower than those of the without MARs group, while SSIM values were significantly higher. In the comparison of different keV images, the AI value decreased with the increase in keV in the range of 80-120 keV, but there was no significant difference between the 120 keV images and 140 keV images. In the group with MARs, the percentage 500HU of 100-140 keV images was significantly lower than that of the 80 keV images, but there was no significant difference between 100, 120, and 140 keV images. In the group without MARs, the percentage 500HU was significantly different among all keV groups.Conclusions: VMS images combined with the MARs algorithm can significantly reduce the metal artifacts of knee prostheses and improve image quality. At an energy level of 100-120 keV, a good metal artifact removal effect and soft tissue contrast can be achieved, and the best metal artifact removal effect can be achieved at 140 keV.

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Optimisation of monoenergetic images to reduce banding artifacts in the lower cervical spine using dual-layer spectral computed tomography: a retrospective study

Zhang,

Zhao,

Wang

et al. 2024

Clinical Radiology

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The Optimal Combination of Monochromatic and Metal Artifact Reconstruction Dual-energy CT to Evaluate Total Knee Replacement Arthroplasty

Cited by 8 publications

References 24 publications

Metal Artifact Reduction Dual-Energy CT as an Accurate and Reliable Method for Measuring Total Knee Arthroplasty Femoral Component Rotation Compared to Conventional CT

Metal Artifact Reduction Dual-Energy CT as an Accurate and Reliable Method for Measuring Total Knee Arthroplasty Femoral Component Rotation Compared to Conventional CT

Application of metal artifact reduction software in gemstone spectral computed tomography for patients after total knee arthroplasty

Optimisation of monoenergetic images to reduce banding artifacts in the lower cervical spine using dual-layer spectral computed tomography: a retrospective study

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