T2*-based Fiber Orientation Mapping

Overview

Journal Neuroimage

Specialty Radiology

Date 2011 May 10

PMID 21549203

Citations 63

Authors

Jongho Lee

Peter van Gelderen

Li-Wei Kuo

Hellmut Merkle

Afonso C Silva

Jeff H Duyn

Affiliations

Soon will be listed here.

Abstract

Recent MRI studies at high field have observed that, in certain white matter fiber bundles, the signal in T(2)*-weighted MRI (i.e. MRI sensitized to apparent transverse relaxivity) is dependent on fiber orientation θ relative to B(0). In this study, the characteristics of this dependency are quantitatively investigated at 7 T using ex-vivo brain specimens, which allowed a large range of rotation angles to be measured. The data confirm the previously suggested variation of R(2)* (=1/T(2)*) with θ and also indicate that this dependency takes the shape of a combination of sin2θ and sin4θ functions, with modulation amplitudes (=ΔR(2)*) reaching 6.44±0.15 Hz (or ΔT(2)*=2.91±0.33 ms) in the major fiber bundles of the corpus callosum. This particular dependency can be explained by a model of local, sub-voxel scale magnetic field changes resulting from magnetic susceptibility sources that are anisotropic. As an illustration of a potential use of the orientation dependence of R(2)*, the feasibility of generating fiber orientation maps from R(2)* data is investigated.

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