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Magnetic Resonance Materials in Physics, Biology and Medicine

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01-02-2017 | Research Article

Application of the limited-memory quasi-Newton algorithm for multi-dimensional, large flip-angle RF pulses at 7T

Authors: Mads S. Vinding, Daniel Brenner, Desmond H. Y. Tse, Sebastian Vellmer, Thomas Vosegaard, Dieter Suter, Tony Stöcker, Ivan I. Maximov

Published in: Magnetic Resonance Materials in Physics, Biology and Medicine | Issue 1/2017

Abstract

Objective

Ultrahigh field MRI provides great opportunities for medical diagnostics and research. However, ultrahigh field MRI also brings challenges, such as larger magnetic susceptibility induced field changes. Parallel-transmit radio-frequency pulses can ameliorate these complications while performing advanced tasks in routine applications. To address one class of such pulses, we propose an optimal-control algorithm as a tool for designing advanced multi-dimensional, large flip-angle, radio-frequency pulses. We contrast initial conditions, constraints, and field correction abilities against increasing pulse trajectory acceleration factors.

Materials and methods

On an 8-channel 7T system, we demonstrate the quasi-Newton algorithm with pulse designs for reduced field-of-view imaging with an oil phantom and in vivo with scans of the human brain stem. We used echo-planar imaging with 2D spatial-selective pulses. Pulses are computed sufficiently rapid for routine applications.

Results

Our dataset was quantitatively analyzed with the conventional mean-square-error metric and the structural-similarity index from image processing. Analysis of both full and reduced field-of-view scans benefit from utilizing both complementary measures.

Conclusion

We obtained excellent outer-volume suppression with our proposed method, thus enabling reduced field-of-view imaging using pulse trajectory acceleration factors up to 4.

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Title: Application of the limited-memory quasi-Newton algorithm for multi-dimensional, large flip-angle RF pulses at 7T
Authors: Mads S. Vinding
Daniel Brenner
Desmond H. Y. Tse
Sebastian Vellmer
Thomas Vosegaard
Dieter Suter
Tony Stöcker
Ivan I. Maximov
Publication date: 01-02-2017
Publisher: Springer Berlin Heidelberg
Published in: Magnetic Resonance Materials in Physics, Biology and Medicine / Issue 1/2017
Print ISSN: 0968-5243
Electronic ISSN: 1352-8661
DOI: https://doi.org/10.1007/s10334-016-0580-1

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Application of the limited-memory quasi-Newton algorithm for multi-dimensional, large flip-angle RF pulses at 7T

Abstract

Objective

Materials and methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objective

Materials and methods

Results

Conclusion

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