Table 1.

Between-subjects variation in 18F-DOPA k_i^cer in striatal subdivisions. 18F-DOPA k_i^cer values acquired during test and retest scans in 8 subjects are presented as mean±S.D. min⁻¹. Spread or variation between subjects is expressed as percentage coefficient of variation (%CV) = SD/mean ×100.

	Test		Retest

	k_i^cer (mean±SD)	CV (%)	k_i^cer (mean±SD)	CV (%)
Whole striatum	0.01417±0.00127	8.9%	0.01381±0.00127	9.2%
Left	0.01427±0.00120	8.4%	0.01408±0.00135	9.6%
Right	0.01409±0.00135	9.6%	0.01354±0.00132	9.7%

Associative	0.01368±0.00130	9.5%	0.01331±0.00137	10.3%
Left	0.01361±0.00130	9.5%	0.01350±0.00150	11.1%
Right	0.01375±0.00138	10.1%	0.01314±0.00142	10.8%

Sensorimotor	0.01485±0.00159	10.7%	0.01489±0.00127	8.5%
Left	0.01473±0.00141	9.5%	0.01512±0.00116	7.7%
Right	0.01489±0.00178	12.0%	0.01458±0.00155	10.7%

Limbic	0.01491±0.00085	5.7%	0.01408±0.00120	8.5%
Left	0.01540±0.00106	6.9%	0.01443±0.00157	10.9%
Right	0.01435±0.00095	6.6%	0.01369±0.00088^*	6.4%

Caudate nucleus	0.01203±0.00120	10.0%	0.01195±0.00131	10.9%
Left	0.01181±0.00118	12.2%	0.01205±0.00132	11.0%
Right	0.01224±0.00120	9.0%	0.01186±0.00139	11.7%

Putamen	0.01522±0.00134	8.8%	0.01512±0.00142	9.4%
Left	0.01541±0.00119	7.7%	0.01530±0.00137	10.4%
Right	0.01503±0.00164	10.9%	0.01493±0.00156	9.0%

Nucleus accumbens	0.01317±0.00090	6.5%	0.01313±0.00101	7.7%
Left	0.01311±0.00103	7.9%	0.01308±0.00111	8.5%
Right	0.01334±0.00124	9.3%	0.01320±0.00124	9.4%

p<0.05 test versus retest scan.