Use of spherical harmonic deconvolution methods to compensate for nonlinear gradient effects on MRI images

Janke, Andrew, Zhao, Huawei, Cowin, Gary J., Galloway, Graham J and Doddrell, David M. (2004) Use of spherical harmonic deconvolution methods to compensate for nonlinear gradient effects on MRI images. Magnetic Resonance In Medicine, 52 1: 115-122. doi:10.1002/mrm.20122


Author Janke, Andrew
Zhao, Huawei
Cowin, Gary J.
Galloway, Graham J
Doddrell, David M.
Title Use of spherical harmonic deconvolution methods to compensate for nonlinear gradient effects on MRI images
Journal name Magnetic Resonance In Medicine   Check publisher's open access policy
ISSN 1522-2594
0740-3194
Publication date 2004-07
Sub-type Article (original research)
DOI 10.1002/mrm.20122
Volume 52
Issue 1
Start page 115
End page 122
Total pages 8
Place of publication Baltimore, USA
Publisher John Wiley & Sons
Language eng
Subject 1199 Other Medical and Health Sciences
1103 Clinical Sciences
Abstract Spatial encoding in MR techniques is achieved by sampling the signal as a function of time in the presence of a magnetic field gradient. The gradients are assumed to generate 6 linear magnetic field gradient, and typical image reconstruction relies upon this approximation. However, high-speed gradients in the current generation of MRI scanners often sacrifice linearity for improvements in speed. Such nonlinearity results in distorted images. The problem is presented in terms of first principles and a correction method based on a gradient field spherical harmonic expansion is proposed. In our case, the amount of distortion measured within a typical field of view (FOV) required for head imaging is sufficiently large that without the use of some distortion correction technique, the images would be of limited use for stereotaxy or longitudinal studies, where precise volumetric information is required. (C) 2004 Wiley-Liss, Inc.
Keyword Radiology, Nuclear Medicine & Medical Imaging
MRI
Gradients
Distortion correction
NMR plotting probe
Spherical harmonics
Geometric Distortion
Spatial Distortion
Phantom
Fields
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Centre for Advanced Imaging Publications
 
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Created: Wed, 19 Sep 2007, 17:18:40 EST