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Neuroimage. 2013 Apr 1;69:87-100. doi: 10.1016/j.neuroimage.2012.11.065. Epub 2012 Dec 16.

Surface based analysis of diffusion orientation for identifying architectonic domains in the in vivo human cortex.

Author information

1
R.M. Lucas Center for Imaging, Radiology, Stanford University, Stanford, CA 94305, USA. mcnabj@stanford.edu

Abstract

Diffusion tensor MRI is sensitive to the coherent structure of brain tissue and is commonly used to study large-scale white matter structure. Diffusion in gray matter is more isotropic, however, several groups have observed coherent patterns of diffusion anisotropy within the cerebral cortical gray matter. We extend the study of cortical diffusion anisotropy by relating it to the local coordinate system of the folded cerebral cortex. We use 1mm and sub-millimeter isotropic resolution diffusion imaging to perform a laminar analysis of the principal diffusion orientation, fractional anisotropy, mean diffusivity and partial volume effects. Data from 6 in vivo human subjects, a fixed human brain specimen and an anesthetized macaque were examined. Large regions of cortex show a radial diffusion orientation. In vivo human and macaque data displayed a sharp transition from radial to tangential diffusion orientation at the border between primary motor and somatosensory cortex, and some evidence of tangential diffusion in secondary somatosensory cortex and primary auditory cortex. Ex vivo diffusion imaging in a human tissue sample showed some tangential diffusion orientation in S1 but mostly radial diffusion orientations in both M1 and S1.

PMID:
23247190
PMCID:
PMC3557597
DOI:
10.1016/j.neuroimage.2012.11.065
[Indexed for MEDLINE]
Free PMC Article

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