Prediction of large joint destruction in patients with rheumatoid arthritis using 18F-FDG PET/CT and disease activitiy score.Prediction of large joint destruction in patients with rheumatoid arthritis using 18F-FDG PET/CT and disease activitiy score. 18F-FDG PET/CTと疾患活動性を用いた関節リウマチの大関節破壊予測