Bone marrow oedema assessment by magnetic resonance imaging in rheumatoid arthritis wrist and metacarpophalangeal joints: the importance of field strength, coil type and image resolution

Simon Krabbe, Iris Eshed, Susanne Juhl Pedersen, Pernille Bøyesen, Jakob M. Møller, Flemming Roland Therkildsen, Mette Bjørndal Axelsen, Ole Rintek Madsen, Mikkel Østergaard

    Publikation: Bidrag til tidsskriftTidsskriftsartikelForskningpeer review

    Abstract

    Objective. The aim of this study was to examine the influence of different MRI unit field strengths, coil types and image resolutions on the OMERACT RA MRI scoring system (RAMRIS) of bone marrow oedema (BME) and image quality.

    Methods. Forty-one patients and 12 healthy controls participated in this cross-sectional study. Coronal short tau inversion recovery (STIR) and T1-weighted sequences were obtained at 0.23, 0.6, 1.5 and 3T using flex coils (Flex). Additional STIR sequences were obtained with phased array extremity coils (Extr) (at 0.6 and 1.5T) and higher resolution (at 1.5T). In otal, 338 STIR image sets were anonymized and scored according to RAMRIS and parameters of image quality were measured.

    Results. The BME sum scores were similar overall when comparing the different MRI units, coil types and voxel sizes, yet significantly higher at the higher resolution of 1.5T Extr compared with 0.23T Flex (P = 0.004), 0.6T Flex (P = 0.03), 1.5T Flex (P = 0.05) and 3T Flex (P = 0.001). Mean differences were relatively minor (0–3.5). Intrareader reliability of BME scores was high [intraclass correlation coefficient ≥ 0.90 for all except 0.23T (0.81) and percentage exact agreement 81–88%]. The smallest detectable difference was better at 0.6, 1.5 and 3T (9–29% of maximum value) than at 0.23T (40%). Image quality was lowest at 0.23T.

    Conclusion. No major, consistent differences were found between BME scores using STIR sequences obtained at different field strengths, coil types and image resolutions, suggesting that these are equally suited for assessment of BME in RA. However, parameters of image quality and intrareader reliability (favouring 0.6, 1.5 and 3T) should be considered when selecting the MRI acquisition strategy.
    OriginalsprogEngelsk
    TidsskriftRheumatology
    Vol/bind53
    Udgave nummer8
    Sider (fra-til)1446-51
    Antal sider5
    ISSN1462-0324
    DOI
    StatusUdgivet - 2014

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