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Influence of field strength, coil type and image resolution on assessment of synovitis by unenhanced MRI – a comparison with contrast-enhanced MRI

  • Magnetic Resonance
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Abstract

Objectives

To explore if the reliability of synovitis assessment by unenhanced MRI is influenced by different MRI field-strengths, coil types and image resolutions in RA patients.

Methods

Forty-one RA patients and 12 healthy controls underwent hand MRI (wrist and 2nd--5th metacarpophalangeal joints) at 4 different field-strengths (0.23 T/0.6 T/1.5 T/3.0 T) on the same day. Seven protocols using a STIR sequence with different field-strengths, coils (flex coils/dedicated phased-array extremity coils) and resolution were applied and scored blindly for synovitis (OMERACT-RAMRIS method). A 1.5 T post-contrast T1-weighted sequence was used as gold standard reference.

Results

Fair-good agreement (ICC=0.38--0.72) between the standard reference and the different STIR protocols (best agreement with extremity coil and small voxel size at 1.5 T). The accuracy for presence/absence of synovitis was very high per person (0.80--1.0), and moderate-high per joint (0.63--0.85), whereas exact agreements on scores were moderate (0.50--0.66). The intrareader agreement (15 patients and 3 controls) on presence/absence of synovitis was very high (0.87--1.0).

Conclusions

Unenhanced MRI using STIR sequence is only moderately reliable for assessing hand synovitis in RA, when contrast-enhanced MRI is considered the gold standard reference. Contrast injection, field strength and coil type influence synovitis assessment, and should be considered before performing MRI in clinical trials and practice.

Key Points

STIR is only moderately reliable for synovitis assessment, compared with post–contrast-T1-w.

Contrast injection, field strength, and coil type influence synovitis assessment.

Contrast injection is recommended for reliable and reproducible hand synovitis assessment.

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Acknowledgements

The scientific guarantor of this publication is Mikkel Ostergaard. The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article. The authors state that this work has not received any funding. One of the authors has significant statistical expertise. Institutional Review Board approval was obtained. Written informed consent was obtained from all subjects (patients) in this study. Some study subjects or cohorts have been previously reported in Rheumatology (Oxford). 2014 Mar 21.: Krabbe S, Eshed I, Pedersen SJ, Bøyesen P, Møller JM, Therkildsen F, Axelsen MB, Madsen OR, Ostergaard M."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." Methodology: prospective, diagnostic or prognostic study, multicenter study.

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Correspondence to Iris Eshed.

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Eshed, I., Krabbe, S., Østergaard, M. et al. Influence of field strength, coil type and image resolution on assessment of synovitis by unenhanced MRI – a comparison with contrast-enhanced MRI. Eur Radiol 25, 1059–1067 (2015). https://doi.org/10.1007/s00330-014-3470-9

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  • DOI: https://doi.org/10.1007/s00330-014-3470-9

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