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Verfasst von:Davids, Mathias [VerfasserIn]   i
 Schad, Lothar R. [VerfasserIn]   i
Titel:Fast three-dimensional inner volume excitations using parallel transmission and optimized k-space trajectories
Verf.angabe:Mathias Davids, Lothar R. Schad, Lawrence L. Wald, and Bastien Guérin
Jahr:2016
Jahr des Originals:2015
Umfang:13 S.
Fussnoten:Gesehen am 04.07.2019 ; Published online 3 November 2015 in Wiley Online Library
Titel Quelle:Enthalten in: Magnetic resonance in medicine
Ort Quelle:New York, NY [u.a.] : Wiley-Liss, 1984
Jahr Quelle:2016
Band/Heft Quelle:76(2016), 4, Seite 1170-1182
ISSN Quelle:1522-2594
Abstract:Purpose To design short parallel transmission (pTx) pulses for excitation of arbitrary three-dimensional (3D) magnetization patterns. Methods We propose a joint optimization of the pTx radiofrequency (RF) and gradient waveforms for excitation of arbitrary 3D magnetization patterns. Our optimization of the gradient waveforms is based on the parameterization of k-space trajectories (3D shells, stack-of-spirals, and cross) using a small number of shape parameters that are well-suited for optimization. The resulting trajectories are smooth and sample k-space efficiently with few turns while using the gradient system at maximum performance. Within each iteration of the k-space trajectory optimization, we solve a small tip angle least-squares RF pulse design problem. Our RF pulse optimization framework was evaluated both in Bloch simulations and experiments on a 7T scanner with eight transmit channels. Results Using an optimized 3D cross (shells) trajectory, we were able to excite a cube shape (brain shape) with 3.4% (6.2%) normalized root-mean-square error in less than 5 ms using eight pTx channels and a clinical gradient system (Gmax?=?40 mT/m, Smax?=?150 T/m/s). This compared with 4.7% (41.2%) error for the unoptimized 3D cross (shells) trajectory. Incorporation of B0 robustness in the pulse design significantly altered the k-space trajectory solutions. Conclusion Our joint gradient and RF optimization approach yields excellent excitation of 3D cube and brain shapes in less than 5 ms, which can be used for reduced field of view imaging and fat suppression in spectroscopy by excitation of the brain only. Magn Reson Med 76:1170?1182, 2016. ? 2015 Wiley Periodicals, Inc.
DOI:doi:10.1002/mrm.26021
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1002/mrm.26021
 Volltext: https://onlinelibrary.wiley.com/doi/full/10.1002/mrm.26021
 DOI: https://doi.org/10.1002/mrm.26021
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:B0 robustness
 inner volume excitation
 k-space trajectory optimization
 Parallel transmit
 spatially selective excitation
K10plus-PPN:166861023X
Verknüpfungen:→ Zeitschrift

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