TABLE 2

Test–Retest Variability

Region	V_T of DC^* (n = 8)			V_T of IC^† (n = 8)			V_T of all subjects (n = 16)					Brain uptake (n = 16)
Region	PD (%)	Absolute PD (%)	ICC	PD (%)	Absolute PD (%)	ICC	PD (%)	Absolute PD (%)	ICC of MABs	ICC of HABs	ICC of all	PD (%)	Absolute PD (%)	ICC of MABs	ICC of HABs	ICC of all
Midbrain	2.8 ± 14.5	12.4	0.96	−1.5 ± 15.6	11.8	0.86	0.6 ± 14.8	12.1	0.41	0.91	0.93	−2.5 ± 11.5	10.1	0.72	0.39	0.71
Thalamus	11.0 ± 10.5	12.8	0.94	−12.3 ± 13.3	12.7	0.86	−0.7 ± 16.7	12.8	0.68	0.84	0.90	−4.7 ± 14.6	11.6	0.74	0.53	0.71
Pons	−2.3 ± 14.2	9.6	0.90	−8.2 ± 23.8	18.9	0.72	−5.3 ± 19.2	14.2	0.54	0.60	0.82	−2.7 ± 12.4	11.0	0.81	0.52	0.77
Pallidostriatum	5.8 ± 21.9	17.6	0.85	−7.0 ± 19.0	14.1	0.87	−0.6 ± 20.9	15.8	0.22	0.79	0.85	−2.2 ± 13.7	11.1	0.79	0.50	0.74
Hippocampus	14.9 ± 17.3	15.7	0.75	−5.9 ± 11.8	9.7	0.91	4.5 ± 17.9	12.7	0.58	0.78	0.83	−2.0 ± 15.2	12.3	0.57	0.23	0.56
Cerebellum	9.6 ± 9.4	10.2	0.94	−4.9 ± 10.0	8.2	0.96	2.3 ± 12.0	9.2	0.76	0.88	0.95	−1.5 ± 9.4	7.8	0.90	0.45	0.87
Neocortex	5.8 ± 12.6	10.2	0.92	−3.2 ± 12.8	10.5	0.92	1.3 ± 13.2	10.4	0.88	0.79	0.92	−2.8 ± 9.6	8.5	0.91	0.57	0.85

↵* V_T using population-adjusted input function of delayed centrifugation.
↵† V_T of immediate centrifugation.