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Diagnostic accuracy of a dual-energy computed tomography-based post-processing method for imaging bone marrow edema following an acute ligamentous knee injury

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Abstract

Objective

This study evaluated the ability of a custom dual-energy CT (DECT) post-processing material decomposition method to image bone marrow edema after acute knee injury. Using an independent validation cohort, the DECT method was compared to gold-standard, fluid-sensitive MRI. By including both quantitative voxel-by-voxel validation outcomes and semi-quantitative radiologist scoring-based assessment of diagnostic accuracy, we aimed to provide insight into the relationship between quantitative metrics and the clinical utility of imaging methods.

Materials and methods

Images from 35 participants with acute anterior cruciate ligament injuries were analyzed. DECT material composition was applied to identify bone marrow edema, and the DECT result was quantitatively compared to gold-standard, registered fluid-sensitive MRI on a per-voxel basis. In addition, two blinded readers rated edema presence in both DECT and fluid-sensitive MR images for evaluation of diagnostic accuracy.

Results

Semi-quantitative assessment indicated sensitivity of 0.67 and 0.74 for the two readers, respectively, at the tibia and 0.55 and 0.57 at the femur, and specificity of 0.87 and 0.89 for the two readers at the tibia and 0.58 and 0.89 at the femur. Quantitative assessment of edema segmentation accuracy demonstrated mean dice coefficients of 0.40 and 0.16 at the tibia and femur, respectively.

Conclusion

The custom post-processing-based DECT method showed similar diagnostic accuracy to a previous study that assessed edema associated with ligamentous knee injury using a CT manufacturer-provided, built-in edema imaging application. Quantitative outcome measures were more stringent than semi-quantitative scoring methods, accounting for the low mean dice coefficient scores.

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Acknowledgements

The authors appreciate the work of Stephanie Kwong, Stacey Purdy, and Debbie Iampen for CT and MRI acquisition, and are grateful to Katrina Koger for participant recruitment and study coordination. The authors thank Peter Salat for contributing to the prospective evaluation of MRI studies to confirm injury diagnosis. Technical assistance from Bryce Besler and Justin Tse was also greatly appreciated. Finally, the authors thank all of our study participants, who volunteered their time for this study.

Funding

This study was funded by Canadian Institutes of Health Research (CIHR) grant number PJT-162189, and by an investigator-initiated grant through the National Basketball Association (NBA)/GE Healthcare Orthopedics and Sports Medicine Collaboration Program. CMJdB was supported by an Alberta Innovates Postgraduate Fellowship.

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Correspondence to Steven K. Boyd.

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All procedures were approved by the University of Calgary Conjoint Health Research Ethics Board (REB19-1184), and were in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Conflict of interest

This study was partially funded by an investigator-initiated grant from the National Basketball Association (NBA)/GE Healthcare Orthopedics and Sports Medicine Collaboration Program. Neither the NBA nor GE Healthcare was involved in the study design or analysis. The authors have no other conflicts of interest to disclose.

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de Bakker, C.M.J., Peedikayil, T., Walker, R.E.A. et al. Diagnostic accuracy of a dual-energy computed tomography-based post-processing method for imaging bone marrow edema following an acute ligamentous knee injury. Skeletal Radiol 51, 1817–1827 (2022). https://doi.org/10.1007/s00256-022-04023-7

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