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Spatial domain method for the design of RF pulses in multicoil parallel excitation

Corresponding Author

William Grissom

[email protected]

Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA

Functional MRI Laboratory, University of Michigan, 2360 Bonisteel Ave., Ann Arbor, MI 48109-2108===Search for more papers by this author

Chun-yu Yip,

Chun-yu Yip

Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan, USA

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Zhenghui Zhang,

Zhenghui Zhang

Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, USA

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V. Andrew Stenger,

V. Andrew Stenger

Department of Medicine, University of Hawaii, Manoa, Hawaii, USA

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Jeffrey A. Fessler,

Jeffrey A. Fessler

Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA

Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan, USA

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Douglas C. Noll,

Douglas C. Noll

Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA

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William Grissom,

Corresponding Author

William Grissom

[email protected]

Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA

Functional MRI Laboratory, University of Michigan, 2360 Bonisteel Ave., Ann Arbor, MI 48109-2108===Search for more papers by this author

Chun-yu Yip,

Chun-yu Yip

Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan, USA

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Zhenghui Zhang,

Zhenghui Zhang

Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, USA

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V. Andrew Stenger,

V. Andrew Stenger

Department of Medicine, University of Hawaii, Manoa, Hawaii, USA

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Jeffrey A. Fessler,

Jeffrey A. Fessler

Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA

Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan, USA

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Douglas C. Noll,

Douglas C. Noll

Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA

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First published: 07 August 2006

https://doi.org/10.1002/mrm.20978

Citations: 271

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Abstract

Parallel excitation has been introduced as a means of accelerating multidimensional, spatially-selective excitation using multiple transmit coils, each driven by a unique RF pulse. Previous approaches to RF pulse design in parallel excitation were either formulated in the frequency domain or restricted to echo-planar trajectories, or both. This paper presents an approach that is formulated as a quadratic optimization problem in the spatial domain and allows the use of arbitrary k-space trajectories. Compared to frequency domain approaches, the new design method has some important advantages. It allows for the specification of a region of interest (ROI), which improves excitation accuracy at high speedup factors. It allows for magnetic field inhomogeneity compensation during excitation. Regularization may be used to control integrated and peak pulse power. The effects of Bloch equation nonlinearity on the large-tip-angle excitation error of RF pulses designed with the method are investigated, and the utility of Tikhonov regularization in mitigating this error is demonstrated. Magn Reson Med, 2006. © 2006 Wiley-Liss, Inc.

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