Longitudinal Imaging in Patients With Large Vessel Vasculitis to Predict Further Disease Course

MRI with and without Gadolinium contrast agent for the following vessels: thoracic aorta (ascending, arch, descending arch, left and right common carotic, subclavian, and vertebral artery)

Standard value uptake measurement (SUV) based on quantitative score normalized to liver (SUV vessel max/liver mean) at the following vessel regions: Carotid artery: common, internal, external; Subclavian artery; Axillary artery; Vertebral artery; Thoracic Aorta; Abdominal Aorta; Common femoral artery; Deep femoral artery; Popliteal artery