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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Acknowledgments
MSV and TV acknowledge support from the Danish Council for Strategic Research, the Danish National Research Foundation (DNRF59), the Ministry of Higher Education and Science (AU-2010-612-181), the Lundbeck Foundation, Aarhus University Research Foundation, and the Programme Commission on Strategic Growth Technologies, Innovation Fund Denmark (0603-00439B). IIM, SV, and DS thank Deutsche Forschungsgemeinschaft grant (SU 192/32-1) for support of this work, and Dr. Daniel Edelhoff and Mr. Raphael Mocek for assistance in the experiments.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Mads S. Vinding and Daniel Brenner contributed equally to the work.
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Vinding, M.S., Brenner, D., Tse, D.H.Y. et al. Application of the limited-memory quasi-Newton algorithm for multi-dimensional, large flip-angle RF pulses at 7T. Magn Reson Mater Phy 30, 29–39 (2017). https://doi.org/10.1007/s10334-016-0580-1
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DOI: https://doi.org/10.1007/s10334-016-0580-1