Clinical Research Directory

Inclusion Criteria: * Male or female participants \>18 years old * Able to give written, informed consent and to lie flat * Either: 1. New clinical diagnosis or acute flare of LVV (Giant-cell arteritis or Takayasu's arteritis) within \~1 week of treatment initiation, and 2. Clinical indication for 18F-FDG PET-CT scan determined by the referring physician, or 3. Undergoing surgery for LVV, or 4. Diagnosis of LVV in remission Exclusion Criteria: * Women of child bearing potential not using adequate contraception * Contra-indication to MRI scanning * Contrast allergy or contrast-nephropathy * Chronic kidney disease (eGFR \<30 mL/min/1.73 m2) * Any medical condition, in the opinion of the investigator, that prevents the participant from lying flat during scanning, or from participating in the study * History of recent malignancy deemed relevant to the study by the investigator