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

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• 作者：Mads S. Vinding ; Daniel Brenner…
• 关键词：MRI ; RF pulse design ; Parallel transmit ; Ultrahigh field MRI
• 刊名：Magnetic Resonance Materials in Physics, Biology and Medicine
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：30
• 期：1
• 页码：29-39
• 全文大小：
• 刊物主题：Imaging / Radiology; Computer Appl. in Life Sciences; Solid State Physics; Biomedical Engineering; Health Informatics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1352-8661
• 卷排序：30

文摘

ObjectiveUltrahigh 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.