[Microstructural abnormalities of basal ganglia and thalamus in children with first-episode Tourette's syndrome: a diffusion tensor imaging study].
OBJECTIVE
To investigate the microstructural integrity of basal ganglia and thalamus in children with first episode drug-naive Tourette's syndrome (TS) by diffusion tensor imaging (DTI).


METHODS
Ten right handed patients with TS (mean age = 8.1 +/- 2.7 years old, 7 males and 3 females) and 10 age and gender-matched healthy control subjects (mean age = 9.5 +/- 1.6 years old, 9 males and 1 female) were recruited. All of the participants had normal findings on conventional MRI. DTI was performed using a 3.0T MR scanner by employing a spin echo single-shot EPI sequence with 15 diffusion encoding directions. Apparent diffusion coefficient (ADC) and fractional anisotropy (FA) maps were generated from each participant's DTI images using DTIStudio software. Bilateral regions of interest (ROI) for the caudate nucleus, putamen,globus pallidus and thalamus were manually traced through ROIEditor software on averaged DWI maps. The differences on DT-MRI variables (ADC, FA) between the two groups were compared using the SPSS13.0 software. Significance level was set at 0.05.


RESULTS
Significant decrease in FA values in left globus pallidus and bilateral thalamus, and increase in ADC values in the bilateral caudate nucleus, bilateral putamen and bilateral thalamus were found in the children with TS compared with the normal controls.


CONCLUSIONS
The results support the hypothesis of abnormalities in basal ganglia and thalamus in the pathophysiology of TS.
Li
Xiu-li
XL
Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China.
Sun
Jin-hua
JH
Li
Fei
F
Huang
Ming-jin
MJ
Li
Qian-qian
QQ
Wu
Qi-zhu
QZ
Zhang
Ti-jiang
TJ
Guo
Lan-ting
LT
Gong
Qi-yong
QY
Huang
Xiao-qi
XQ
D000293:Adolescent; D016880:Anisotropy; D001479:Basal Ganglia / Q000473:pathology*; D016022:Case-Control Studies; D002648:Child; D038524:Diffusion Magnetic Resonance Imaging; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D013788:Thalamus / Q000473:pathology*; D005879:Tourette Syndrome / Q000473:pathology*