68Ga-FAPI has been developed as a tumor-targeting agent as fibroblast activation protein is
overexpressed in cancer-associated fibroblasts and some inflammation, such as IgG4-related
disease. Therefore, this prospective study is going to investigate whether 68Ga-FAPI PET/CT
may be superior for disease activity assessment and follow-up of psoriatic arthritis than
18F-NAF PET/CT.