Post-processing:

Post-processing was performed using OLEA SPHERE software (ver 2.2) as part of Vitrea 6.81 (Vital Images Inc., Minnesota, USA). The workflow was semi-automated using the OLEA workflow with a step-by-step guide in a locally designed handbook. Automated sequence identification, motion correction and automatic arterial input function steps were used. Adjustments to these steps, including manual arterial input function, were made if required. 
The volumetric T1 weighted pre-contrast TRICKS images and subtracted MRA sequences were used in post processing. Image representation of the peak enhancement\cite{Cuenod_2013} was fused in colour with the TRICKS volumetric T1-weighted sequence and reconstructed in the coronal plane, which was the plane of acquisition. In cases where the volumetric T1 images were not available, the peak enhancement data was fused onto the standard T1 coronal image. The coronal fused reconstructions were exported back to the local PACS viewer for interpretation with the enhancement curve as a qualitative indicator of the sufficiency of each study. 
 *Example images*

Radiologist interpretation:

3 consultant MSK radiologists (with at least 10 years’ experience each) reviewed each anonymised study for synovitis and erosions, as per a modified OMERACT RAMRIS scoring method\cite{Bird2005}. Scoring was performed on separate occasions on the standard and fusion images in the absence of a previous report or clinical findings.