High Resolution Diffusion-Weighted Imaging in Human at 7T

Introduction Diffusion-weighted imaging (DWI) and therefore fiber tractography is a challenge at ultra-high field strength, because geometric distortions due to off-resonance effects as well as image blurring due to T2* decay scale with field strength. For OVS a SKEWED pulse was used as proposed in...

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Bibliographic Details
Published in:NeuroImage (Orlando, Fla.) Fla.), 2009-07, Vol.47, p.S73-S73
Main Authors: Heidemann, RM, Anwander, A, Feiweier, T, Fasano, F, Pfeuffer, J, Knösche, TR, Turner, R
Format: Article
Language:English
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Acquisitions & mergers
Diffusion
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Summary:Introduction Diffusion-weighted imaging (DWI) and therefore fiber tractography is a challenge at ultra-high field strength, because geometric distortions due to off-resonance effects as well as image blurring due to T2* decay scale with field strength. For OVS a SKEWED pulse was used as proposed in (Hwang1999, Pfeuffer2002) and for the GRAPPA reconstruction a 2D convolution kernel (Griswold2004) with 3 source points along the readout direction and four source points along phase encoding direction was used with an acceleration factor of two.
ISSN:1053-8119
1095-9572
DOI:10.1016/S1053-8119(09)70455-0