F-18-FDG PET imaging of rheumatoid knee synovitis correlates with dynamic magnetic resonance and sonographic assessments as well as with the serum level of metalloproteinase-3
rheumatoid arthritis; synovitis imaging; FDG PET; magnetic resonance imaging; ultrasonography
Abstract :
[en] Purpose: The aim of this study was to assess rheumatoid arthritis (RA) synovitis with positron emission tomography (PET) and F-18-fluorodeoxyglucose (F-18-FDG) in comparison with dynamic magnetic resonance imaging (MRI) and ultrasonography (US). Methods: Sixteen knees in 16 patients with active RA were assessed with PET, MRI and US at baseline and 4 weeks after initiation of anti-TNF-alpha treatment. All studies were performed within 4 days. Visual and semi-quantitative (standardised uptake value, SUV) analyses of the synovial uptake of FDG were performed. The dynamic enhancement rate and the static enhancement were measured after i.v. gadolinium injection and the synovial thickness was measured in the medial, lateral patellar and suprapatellar recesses by US. Serum levels of C-reactive protein (CRP) and metalloproteinase-3 (MMP-3) were also measured. Results: PET was positive in 69% of knees while MRI and US were positive in 69% and 75%. Positivity on one imaging technique was strongly associated with positivity on the other two. PET-positive knees exhibited significantly higher SUVs, higher MRI parameters and greater synovial thickness compared with PET-negative knees, whereas serum CRP and MMP-3 levels were not significantly different. SUVs were significantly correlated with all MRI parameters, with synovial thickness and with serum CRP and MMP-3 levels at baseline. Changes in SUVs after 4 weeks were also correlated with changes in MRI parameters and in serum CRP and MMP-3 levels, but not with changes in synovial thickness. Conclusion: F-18-FDG PET is a unique imaging technique for assessing the metabolic activity of synovitis. The PET findings are correlated with MRI and US assessments of the pannus in RA, as well as with the classical serum parameter of inflammation, CRP, and the synovium-derived parameter, serum MMP-3. Further studies are warranted to establish the place of metabolic imaging of synovitis in RA.
Disciplines :
Radiology, nuclear medicine & imaging
Author, co-author :
Beckers, Catherine ; Centre Hospitalier Universitaire de Liège - CHU > Médecine nucléaire
Jeukens, Xavier
Ribbens, Clio ; Centre Hospitalier Universitaire de Liège - CHU > Rhumatologie
Andre, Béatrice ; Centre Hospitalier Universitaire de Liège - CHU > Rhumatologie
Marcelis, Stefaan
Leclercq, Philippe ; Centre Hospitalier Universitaire de Liège - CHU > Architecture technique et infrastructure
Kaiser, Marie-Joëlle ; Centre Hospitalier Universitaire de Liège - CHU > Rhumatologie
Willems, Jacqueline ; Centre Hospitalier Universitaire de Liège - CHU > Médecine nucléaire
Hustinx, Roland ; Université de Liège - ULiège > Département des sciences cliniques > Médecine nucléaire
Malaise, Michel ; Université de Liège - ULiège > Département des sciences cliniques > Rhumatologie
Language :
English
Title :
F-18-FDG PET imaging of rheumatoid knee synovitis correlates with dynamic magnetic resonance and sonographic assessments as well as with the serum level of metalloproteinase-3
Publication date :
March 2006
Journal title :
European Journal of Nuclear Medicine and Molecular Imaging
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