Fast three-dimensional inner volume excitations using parallel transmission and optimized k-space trajectories
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...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2016
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| In: |
Magnetic resonance in medicine
Year: 2015, Volume: 76, Issue: 4, Pages: 1170-1182 |
| ISSN: | 1522-2594 |
| DOI: | 10.1002/mrm.26021 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1002/mrm.26021 Verlag, Volltext: https://onlinelibrary.wiley.com/doi/full/10.1002/mrm.26021 
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| Author Notes: | Mathias Davids, Lothar R. Schad, Lawrence L. Wald, and Bastien Guérin |
| Summary: | 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. |
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| Item Description: | Gesehen am 04.07.2019 Published online 3 November 2015 in Wiley Online Library |
| Physical Description: | Online Resource |
| ISSN: | 1522-2594 |
| DOI: | 10.1002/mrm.26021 |