| Virtual frequency encoding: achieving symmetry in k-space. | |
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MedLine Citation:
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PMID: 9621928 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Chemical shift artifacts and other off-resonance spatial shifts in 2DFT MRI arise from the linear time dependence in the k-space data in the readout direction. Introduction of a view-dependent time shift of the readout window adds a time dependence to the phase-encoding direction and results in a virtual frequency-encoding direction that is a linear combination of the phase-encode and readout axes. By this method, the readout and phase-encode directions can be made identical in their sensitivity to off-resonance effects and can be arbitrarily swapped with no change in chemical shift or inhomogeneity effects, improving previously reported methods that swap these axes for signal averaging or reduction of motion artifacts. |
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Authors:
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R S Hinks; J A Derbyshire; P L LeRoux |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine Volume: 39 ISSN: 0740-3194 ISO Abbreviation: Magn Reson Med Publication Date: 1998 Jun |
Date Detail:
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Created Date: 1998-08-21 Completed Date: 1998-08-21 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8505245 Medline TA: Magn Reson Med Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1019-24 Citation Subset: IM |
Affiliation:
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Department of Medical Biophysics, University of Toronto, Sunnybrook Health Science Center, Ontario, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts Brain / anatomy & histology Computer Graphics Fourier Analysis Humans Image Enhancement / instrumentation* Image Processing, Computer-Assisted / instrumentation* Magnetic Resonance Imaging / instrumentation* Magnetic Resonance Spectroscopy / instrumentation* Phantoms, Imaging Sensitivity and Specificity User-Computer Interface* |
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