- 作者：Louise Emsell ; louise.emsell@med.kuleuven.be ; Alexander Leemans ; Camilla Langan ; Wim Van Hecke ; Gareth J. Barker ; Peter McCarthy ; Ben Jeurissen ; Jan Sijbers ; Stefan Sunaert ; Dara M. Cannon ; Colm McDonald
- 关键词：Bipolar disorder ; diffusion imaging ; euthymic ; fractional anisotropy ; MRI ; tractography
- 刊名：Biological Psychiatry
- 出版年：2013
- 出版时间：15 January, 2013
- 年：2013
- 卷：73
- 期：2
- 页码：194-201
- 全文大小：1192 K
Background
White matter microstructural changes detected using diffusion tensor imaging have been reported in bipolar disorder. However, findings are heterogeneous, which may be related to the use of analysis techniques that cannot adequately model crossing fibers in the brain. We therefore sought to identify altered diffusion anisotropy and diffusivity changes using an improved high angular resolution fiber-tracking technique.Methods
Diffusion magnetic resonance imaging data was obtained from 35 prospectively confirmed euthymic bipolar disorder type 1 patients (age 22-59) and 43 control subjects (age 22-59) drawn from a sample of 120 age- and gender-matched demographically similar case-control pairs. Tractography using a constrained spherical deconvolution approach to account for crossing fibers was implemented. Changes in fractional anisotropy, mean diffusivity, axial diffusivity, and radial diffusivity between patient and control groups in subdivisions of the corpus callosum, cingulum, and fornix were measured as indicators of trait differences in white matter microstructural organization in bipolar disorder.
Results
Patients had significantly reduced fractional anisotropy and increased mean diffusivity and radial diffusivity in all divisions of the corpus callosum, left fornix, and subgenual cingulum compared with control subjects. Axial diffusivity was increased in the fornix bilaterally and right dorsal-anterior cingulum.
Conclusions
By using an improved fiber-tracking method in a clinically homogeneous population, we were able to localize trait diffusivity changes to specific subdivisions of limbic fiber pathways, including the fornix. Our findings extend previous reports of altered limbic system microstructural disorganization as a trait feature of bipolar disorder.