Fast Large-Tip-Angle Multidimensional and Parallel RF Pulse Design in MRI
dc.contributor.author | Grissom, William Allyn | en_US |
dc.contributor.author | Xu, Dan | en_US |
dc.contributor.author | Kerr, Adam B. | en_US |
dc.contributor.author | Fessler, Jeffrey A. | en_US |
dc.contributor.author | Noll, Douglas C. | en_US |
dc.date.accessioned | 2011-08-18T18:21:20Z | |
dc.date.available | 2011-08-18T18:21:20Z | |
dc.date.issued | 2009-05-11 | en_US |
dc.identifier.citation | Grissom, W.A.; Xu, D.; Kerr, A.B.; Fessler, J.A.; Noll, D.C. (2009). "Fast Large-Tip-Angle Multidimensional and Parallel RF Pulse Design in MRI." IEEE Transactions on Medical Imaging 28(10): 1548-1559. <http://hdl.handle.net/2027.42/86004> | en_US |
dc.identifier.issn | 0278-0062 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/86004 | |
dc.description.abstract | Large-tip-angle multidimensional radio-frequency (RF) pulse design is a difficult problem, due to the nonlinear response of magnetization to applied RF at large tip-angles. In parallel excitation, multidimensional RF pulse design is further complicated by the possibility for transmit field patterns to change between subjects, requiring pulses to be designed rapidly while a subject lies in the scanner. To accelerate pulse design, we introduce a fast version of the optimal control method for large-tip-angle parallel excitation. The new method is based on a novel approach to analytically linearizing the Bloch equation about a large-tip-angle RF pulse, which results in an approximate linear model for the perturbations created by adding a small-tip-angle pulse to a large-tip-angle pulse. The linear model can be evaluated rapidly using nonuniform fast Fourier transforms, and we apply it iteratively to produce a sequence of pulse updates that improve excitation accuracy. We achieve drastic reductions in design time and memory requirements compared to conventional optimal control, while producing pulses of similar accuracy. The new method can also compensate for nonidealities such as main field inhomogeneties. | en_US |
dc.publisher | IEEE | en_US |
dc.title | Fast Large-Tip-Angle Multidimensional and Parallel RF Pulse Design in MRI | en_US |
dc.type | article | en_US |
dc.subject.hlbsecondlevel | Biomedical Engineering | en_US |
dc.subject.hlbtoplevel | Engineering | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Biomedical Engineering Department | en_US |
dc.contributor.affiliationother | Information Systems and Radiological Sciences Laboratories, Stanford University, Stanford, CA 94305 USA. Global Applied Research Laboratory, GE Healthcare, Waukesha, WI 53188 USA. | en_US |
dc.identifier.pmid | 19447704 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/86004/1/Fessler12.pdf | |
dc.identifier.doi | 10.1109/TMI.2009.2020064 | en_US |
dc.identifier.source | IEEE Transactions on Medical Imaging | en_US |
dc.owningcollname | Electrical Engineering and Computer Science, Department of (EECS) |
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