Table 3 Test-retest metrics of [¹⁸F]FE-PE2I PET measurements (n = 9)

Striatum

1.55 ± 0.33, 21.1

1.56 ± 0.32, 20.5

5.3

0.95 (0.82–0.989)

0.195

− 8.3

Caudate

1.84 ± 0.55, 29.9

1.88 ± 0.59, 31.4

6.0

0.97 (0.89–0.99)

0.264

− 8.9

Putamen

1.26 ± 0.32, 25.3

1.25 ± 0.22, 17.8

7.5

0.91 (0.68–0.98)

0.225

− 11.9

Ventral striatum

2.21 ± 0.53, 23.9

2.13 ± 0.38, 17.9

6.5

0.89 (0.61–0.97)

0.426

− 12.1

Substantia nigra

0.72 ± 0.17, 23.2

0.72 ± 0.1, 14.5

10.6

0.74 (0.24–0.93)

0.194

− 17.9