Table 3.

Spearman’s correlation between local CBF and diffusion parameters in PD group (n = 26) within all the ROIs.

ROI	FA		MD		AD		RD
	r	pFDR	r	pFDR	r	pFDR	r	pFDR
Substantia Nigra	+0.058	0.777	+0.015	0.941	−0.016	0.939	+0.201	0.692
Caudate	+0.543	0.028	−0.661	0.002	−0.628	0.007	−0.635	0.003
Pallidum	+0.382	0.126	−0.112	0.682	−0.032	0.939	−0.110	0.692
Putamen	−0.096	0.747	+0.320	0.391	+0.345	0.294	+0.0211	0.692
Thalamus	+0.128	0.747	−0.156	0.666	−0.175	0.688	−0.164	0.692
Red nucleus	−0.431	0.098	−0.236	0.572	−0.275	0.406	+0.024	0.906
Subthalamic Nucleus	+0.239	0.420	−0.284	0.666	−0.201	0.706	+0.123	0.692

AD, axial diffusivity; CBF, cerebral blood flow; FA, fractional anisotropy; FDR, false discovery rate; MD, mean diffusivity; PD, Parkinson’s disease; RD, radial diffusivity; ROI, region of interest. P-values lower than 0.05 were considered significant (in bold).