Abstract
Objectives
To evaluate the ability of dual-energy computed tomography (DECT) to improve diagnostic discrimination between gout and other crystal arthropathies such as calcium pyrophosphate deposition disease (CPPD) of the wrist in a clinical patient population.
Materials and methods
This retrospective case-control study included 29 patients with either gout (case group; n = 9) or CPPD (control group; n = 20) who underwent DECT of the wrist for clinically suspected crystal arthropathy. Color-coded urate and enhanced calcium as well as virtual 120 kVe blended images were reconstructed from the DECT datasets. Two independent and blinded readers evaluated each reconstructed dataset for the presence of depositions in 17 predefined regions. Additionally, a global diagnosis was made first for 120 kVe images only, based solely on morphologic criteria, and subsequently for all reconstructed images.
Results
Sensitivity for the global diagnosis of gout was 1.0 (95% CI 0.63–1) for both DECT and 120 kVe images with specificities of 0.70 (95% CI 0.46–0.87) for DECT and 0.80 (95% CI 0.56–0.93) for 120 kVe images. Color-coded DECT images did not detect more depositions than monochrome standard CT images.
Conclusion
Discrimination of crystal arthropathies of the wrist is limited using DECT and primarily relying on color-coded images. Evaluation of morphologic criteria on standard CT images is essential for accurate diagnosis.
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Acknowledgments
We wish to thank Mr Jürgen Mews for technical support and Mrs Bettina Herwig for language editing of the manuscript.
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The local ethics review board waived approval of this study due to its retrospective nature. Prior to the CT examination, patients gave written informed consent to the scientific use of imaging and clinical data, which is the standard procedure at our institution.
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Ziegeler, K., Hermann, S., Hermann, K.G.A. et al. Dual-energy CT in the differentiation of crystal depositions of the wrist: does it have added value?. Skeletal Radiol 49, 707–713 (2020). https://doi.org/10.1007/s00256-019-03343-5
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DOI: https://doi.org/10.1007/s00256-019-03343-5