Dynamic field map estimation using a spiral-in/spiral-out acquisition
dc.contributor.author | Sutton, Bradley P. | en_US |
dc.contributor.author | Noll, Douglas C. | en_US |
dc.contributor.author | Fessler, Jeffrey A. | en_US |
dc.date.accessioned | 2006-04-19T13:59:18Z | |
dc.date.available | 2006-04-19T13:59:18Z | |
dc.date.issued | 2004-06 | en_US |
dc.identifier.citation | Sutton, Bradley P.; Noll, Douglas C.; Fessler, Jeffrey A. (2004)."Dynamic field map estimation using a spiral-in/spiral-out acquisition." Magnetic Resonance in Medicine 51(6): 1194-1204. <http://hdl.handle.net/2027.42/34930> | en_US |
dc.identifier.issn | 0740-3194 | en_US |
dc.identifier.issn | 1522-2594 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/34930 | |
dc.identifier.uri | http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=retrieve&db=pubmed&list_uids=15170840&dopt=citation | en_US |
dc.description.abstract | The long readout times of single-shot acquisitions and the high field strengths desired for functional MRI (fMRI) using blood oxygenation level-dependent (BOLD) contrast make functional scans sensitive to magnetic field inhomogeneity. If it is not corrected during image reconstruction, field inhomogeneity can cause geometric distortions in the images when Cartesian k -space trajectories are used or blurring with spiral acquisitions. Many traditional methods to correct for field inhomogeneity distortions rely on a static field map measured with the use of images that are themselves distorted. In this work, we employ a regularized least-squares approach to jointly estimate both the undistorted image and field map at each acquisition using a spiral-in/spiral-out pulse sequence. Simulation and phantom studies show that this method is accurate and stable over a time series. Human functional studies show that the jointly estimated field map may be more accurate than standard field map estimates in the presence of respiration-induced phase oscillations, leading to better detection of functional activation. The proposed method measures a dynamic field map that accurately tracks magnetic field drift and respiration-induced phase oscillations during the course of a functional study. Magn Reson Med 51:1194–1204, 2004. © 2004 Wiley-Liss, Inc. | en_US |
dc.format.extent | 585258 bytes | |
dc.format.extent | 3118 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.language.iso | en_US | |
dc.publisher | Wiley Subscription Services, Inc., A Wiley Company | en_US |
dc.subject.other | Life and Medical Sciences | en_US |
dc.subject.other | Imaging | en_US |
dc.title | Dynamic field map estimation using a spiral-in/spiral-out acquisition | en_US |
dc.type | Article | en_US |
dc.rights.robots | IndexNoFollow | en_US |
dc.subject.hlbtoplevel | Health Sciences | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan ; 2100 S. Goodwin Ave., Urbana, IL 61801 | en_US |
dc.contributor.affiliationum | Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan | en_US |
dc.contributor.affiliationum | Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan | en_US |
dc.identifier.pmid | 15170840 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/34930/1/20079_ftp.pdf | en_US |
dc.identifier.doi | http://dx.doi.org/10.1002/mrm.20079 | en_US |
dc.identifier.source | Magnetic Resonance in Medicine | en_US |
dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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