Table 1

Fractional anisotropy (FA) values in five circuits of the extrapyramidal system

Circuits (corresponding regions)
P (II+III+IV)First (II+III)Second (II)Third (I+II+III)Fourth (I+II+III+IV)
Parkinsonian patients showed a significant decrease in FA values in the third and fourth accessory circuits, regardless of clinical stage.
*p<0.05, **p<0.01.
P, principal circuit; PD12, Parkinson’s disease in the early stage group; PD345, Parkinson’s disease in the advanced stage group; PSP, progressive supranuclear palsy.
Control0.4900.4830.5830.5420.542
PD120.4510.4450.5480.493*0.434*
PD3450.4560.4560.5370.495*0.493*
PSP0.403**0.410**0.449**0.439**0.432**