Table 2. Reliability of K₁ Values between “Test” and “Retest” Scans in All the Brain Regions.

regions	K1 Test ± SD	K1 Retest ± SD	Rel. Diff. K1 (%)	TRV K1 (%)	CV (%) K1 test	CV (%) K1 Retest	ICC K1
amygdala	0.24 ± 0.04	0.21 ± 0.04	–7.75	8.07	15.61	20.88	0.287
cerebellum	0.34 ± 0.03	0.3 ± 0.04	–7.86	8.18	8.65	17.44	0.15
corpus callosum	0.23 ± 0.04	0.19 ± 0.03	–7.91	8.24	15.83	24.14	0.521
medial geniculate	0.26 ± 0.04a	0.23 ± 0.03a	–6.52	6.74	13.42	19.60	0.741
mesencephalic region	0.34 ± 0.03	0.29 ± 0.02	–9.95	10.47	9.48	14.89	–0.04
septum	0.25 ± 0.03a	0.2 ± 0.03a	–11.07	11.72	12.72	26.20	0.537
superior colliculus	0.32 ± 0.04	0.28 ± 0.04	–5.90	6.08	12.26	18.83	0.493
striatum	0.22 ± 0.04	0.19 ± 0.03	–7.89	8.22	16.70	23.79	0.616
cortex	0.22 ± 0.03	0.2 ± 0.04	–4.01	4.09	13.44	23.11	0.692
hippocampus	0.24 ± 0.03	0.21 ± 0.04	–8.86	9.28	14.34	22.80	0.555
hypothalamus	0.3 ± 0.04	0.26 ± 0.05	–8.94	9.35	13.96	19.04	0.688
mid brain	0.33 ± 0.05	0.28 ± 0.03	–8.67	9.06	14.66	16.59	0.128
brainstem	0.38 ± 0.04	0.34 ± 0.04	–7.98	8.31	10.01	14.78	–0.021
thalamus	0.27 ± 0.04	0.23 ± 0.03	–7.53	7.82	15.02	20.94	0.428
basal ganglia	0.24 ± 0.04	0.2 ± 0.03	–9.18	9.62	15.40	21.83	0.37
whole brain	0.26 ± 0.03	0.23 ± 0.04	–6.65	6.88	12.38	20.42	0.522
mean ± SD			–7.92 ± 1.66	8.26 ± 1.79	13.37 ± 2.36	20.33 ± 3.32	0.42 ± 0.25

^aSignificant differences between “Test” and “Retest” scan (p < 0.05).