Fig. 1From: Performance of 18F-sodium fluoride positron emission tomography with computed tomography to assess inflammatory and structural sacroiliitis on magnetic resonance imaging and computed tomography, respectively, in axial spondyloarthritisMethodology of the semi-quantitative evaluation of the SIJ using for quadrants, based on the SPARCC MRI SIJ inflammation score on the cartilaginous part of the SIJ (a). Application on PET/CT (b), CT scan (c), and MRI (d)Back to article page