Table 2. Results of the semi-quantitative analysis of the patient studies.

	reduced DAT availability (n = 40)			normal DAT availability (n = 22)
	no AC	CT-based	Chang	no AC	CT-based	Chang
SBR caudate	1.85±0.75	2.03±0.71	2.42±0.83	3.01±0.51	3.15±0.54	3.67±0.65
SBR putamen	0.80±0.41	0.96±0.44	1.07±0.46	1.64±0.21	1.89±0.26	2.00±0.25
SBR striatum	1.33±0.57	1.51±0.57	1.78±0.65	2.36±0.35	2.54±0.39	2.91±0.45
caudate-to-putamen ratio	2.67±0.84	2.37±0.61	2.53±0.64	1.93±0.30	1.75±0.23	1.91±0.28
asymmetry caudate (%)	15.17±11.95	14.92±12.19	12.59±10.82	7.06±6.14	6.95±5.53	6.52±5.87
Asymmetry putamen (%)	23.28±24.18	20.50±15.81	18.82±16.84	9.11±7.91	7.15±7.81	9.06±8.29
asymmetry striatum (%)	15.92±12.94	15.43±11.58	13.35±10.65	5.65±5.13	6.00±4.55	5.28±5.15

Given are mean values ±1 standard deviation (minimum over both hemispheres for the SBRs, maximum over both hemispheres for the caudate-to-putamen ratio). Subjects were categorized as ‘reduced’ or ‘normal’ DAT availability according to the written report in the patient’s file.