Table 1 Clinical characteristics and PET/CT measurements in RA patients

Age (years; mean ± SD)

55.7 ± 9.8

Gender

5 males, 14 females

Erythrocyte sedimentation rate (ESR, mm/h)

58.0 ± 29.1

C-reactive protein (CRP, mg/dL)

3.8 ± 4.3

Tender joint counts (TJC)*

10.5 ± 4.9

Swollen joint counts (SJC)*

8.8 ± 4.7

VAS of pain

6.3 ± 1.4

PGA of disease activity

6.0 ± 1.3

EGA of disease activity

7.0 ± 1.1

HAQ-DI

1.7 ± 0.8

SF-36

46.6 ± 9.3

CDAI*

32.4 ± 9.8

SDAI*

36.1 ± 12.6

DAS28-ESR*

6.1 ± 0.9

DAS28-CRP*

5.6 ± 1.3

TSU_FAPI (SUV bw*ml)

524.8 ± 552.4

MSV_FAPI (mL)

130.9 ± 134.7

SUV_max of ⁶⁸ Ga-FAPI PET/CT

9.1 ± 4.6

TSUG_FDG (SUV bw*ml)

271.1 ± 332.8

MSV_FDG (mL)

77.9 ± 86.1

SUVmax of ¹⁸F-FDG PET/CT

5.9 ± 2.9