| Real-time motion and B(0) corrected single voxel spectroscopy using volumetric navigators. | |
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MedLine Citation:
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PMID: 21381101 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In population groups where head pose cannot be assumed to be constant during a magnetic resonance spectroscopy examination or in difficult-to-shim regions of the brain, real-time volume of interest, frequency, and shim optimization may be necessary. We investigate the effect of pose change on the B(0) homogeneity of a (2 cm)(3) volume and observe typical first-order shim changes of 1 μT/m per 1° rotation (chin down to up) in four different volumes of interest in a single volunteer. An echo planar imaging volume navigator was constructed to measure and apply in real-time within each pulse repetition time: volume of interest positioning, frequency adjustment, and first-order shim adjustment. This volume navigator is demonstrated in six healthy volunteers and achieved a mean linewidth of 4.4 Hz, similar to that obtained by manual shim adjustment of 4.9 Hz. Furthermore, this linewidth is maintained by the volume navigator at 4.9 Hz in the presence of pose change. By comparison, a mean linewidth of 7.5 Hz was observed, when no correction was applied. Magn Reson Med, 2011. © 2011 Wiley-Liss, Inc. |
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Authors:
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Aaron T Hess; M Dylan Tisdall; Ovidiu C Andronesi; Ernesta M Meintjes; André J W van der Kouwe |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-4 |
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: - ISSN: 1522-2594 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-3-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8505245 Medline TA: Magn Reson Med Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright &© 2011 Wiley-Liss, Inc. |
Affiliation:
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Department of Human Biology, MRC/UCT Medical Imaging Research Unit, University of Cape Town, South Africa. aaron.hess@gmail.com. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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