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. 2021 Sep 3;5:38. doi: 10.1186/s41747-021-00228-y

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Dual-energy computed tomography scan of hands in a patient with rheumatoid arthritis. Magnification on the second metacarpophalangeal joint shows a normal and smooth outline of cartilage and bone plate (short arrows) on standard grayscale series (a) and normal virtual non-calcium attenuation (b). Conversely, bone marrow edema is evident on the third metacarpophalangeal joint presenting as an extensive and ill-defined green area (long arrows). Magnetic resonance imaging by means of T2-weighted fat-saturation sequence confirmed the presence of inflammatory bone marrow edema (c). From Jans et al. [72]