IntroductionErosive immune-mediated polyarthritis (IMPA) carries a poor prognosis due to irreversible joint destruction and poor response to therapy. Monitoring response to therapy can be challenging as systemic markers like C-reactive protein (CRP) are nonspecific for underlying causes of inflammation and repeated joint fluid collection by arthrocentesis for cytological analysis is invasive. In humans, several imaging methods are used to monitor synovial or periarticular blood flow including di