Localized eddy current compensation using quantitative field mapping.

Details

Serval ID
serval:BIB_AE5A8619FDD9
Type
Article: article from journal or magazin.
Collection
Publications
Title
Localized eddy current compensation using quantitative field mapping.
Journal
Journal of Magnetic Resonance
Author(s)
Terpstra M., Andersen P.M., Gruetter R.
ISSN
1090-7807 (Print)
ISSN-L
1090-7807
Publication state
Published
Issued date
1998
Volume
131
Number
1
Pages
139-143
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, P.H.S.Publication Status: ppublish
Abstract
Eddy current effects induced by switched gradients in proximal conducting structures are traditionally reduced by applying preemphasis currents whose amplitudes and decay characteristics must be set to offset the eddy current fields. We present an expeditious, localized, and quantitative method for mapping and adjusting the parameters for eddy current compensation. Mapping is based on analysis of projections as used in the fast automatic shimming technique by mapping along projections (FASTMAP). Adjustment methods are demonstrated in high-field horizontal bore systems. The proposed localized eddy current mapping technique may also be used for localized measurements in situations where asymmetric conducting structures may cause nonlinear eddy current fields, such as in interventional MRI and open magnet designs.
Keywords
Algorithms, Animals, Brain/metabolism, Equipment Design, Image Enhancement/methods, Image Processing, Computer-Assisted/methods, Magnetic Resonance Imaging/instrumentation, Magnetic Resonance Imaging/methods, Magnetic Resonance Spectroscopy/instrumentation, Magnetic Resonance Spectroscopy/methods, Radiology, Interventional, Rats
Pubmed
Web of science
Create date
04/08/2010 16:28
Last modification date
20/08/2019 16:18
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