| Non-Cartesian sampled centric scan SPRITE imaging with magnetic field gradient and B0(t) field measurements for MRI in the vicinity of metal structures. | |
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MedLine Citation:
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PMID: 20650669 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This paper proposes the possibility of spatially resolved MRI measurements undertaken inside metallic cells. MRI has been rarely usable inside conducting vessels due to the eddy currents in the walls caused by switching magnetic field gradients, which render most advanced MRI pulse sequences impossible. We propose magnetic field gradient waveform monitoring (MFGM) for MRI of samples inside metallic cells. In this work the MFGM method was extended to measure the B(0) field temporal evolution associated with gradient waveforms. MFGM was used to observe and correct eddy current effects associated with a metallic cell. High quality centric scan SPRITE images result from such corrections. MRI of samples held under pressure, most notably rock core samples, traditionally employs cells that are non-magnetic and fabricated from polymeric materials. The natural material for high-pressure MRI is however non-ferromagnetic metal given their high tensile strengths and high thermal conductivity. MRI measurement of macroscopic samples at high pressure would be generally possible if metallic pressure vessels could be employed. This study will form the basis of new MRI compatible metallic pressure vessels, which will permit MRI of macroscopic systems at high pressure. |
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Authors:
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Hui Han; Derrick Green; Matthew Ouellette; Rodney MacGregor; Bruce J Balcom |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-07-01 |
Journal Detail:
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Title: Journal of magnetic resonance (San Diego, Calif. : 1997) Volume: 206 ISSN: 1096-0856 ISO Abbreviation: J. Magn. Reson. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-23 Completed Date: 2010-12-08 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9707935 Medline TA: J Magn Reson Country: United States |
Other Details:
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Languages: eng Pagination: 97-104 Citation Subset: IM |
Copyright Information:
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(c) 2010 Elsevier Inc. All rights reserved. |
Affiliation:
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MRI Centre, Department of Physics, University of New Brunswick, Fredericton, New Brunswick, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms Butadienes Calibration Elastomers Electromagnetic Fields Linear Models Magnetic Resonance Imaging / methods* Metals* Pressure Temperature Tensile Strength |
| Chemical | |
Reg. No./Substance:
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0/Butadienes; 0/Elastomers; 0/Metals; 9003-17-2/polybutadiene |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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