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Tailored excitation using nonlinear B 0 ‐shims
Author(s) -
Duan Qi,
van Gelderen Peter,
Duyn Jeff
Publication year - 2012
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.23278
Subject(s) - flip angle , excitation , homogeneity (statistics) , pulse (music) , nonlinear system , sensitivity (control systems) , nuclear magnetic resonance , optics , pulse duration , amplitude , physics , materials science , magnetic resonance imaging , computer science , laser , electronic engineering , medicine , quantum mechanics , machine learning , detector , radiology , engineering
In high‐field MRI, RF flip angle inhomogeneity due to wavelength effects can lead to spatial variations in contrast and sensitivity. Improved flip angle homogeneity can be achieved through multidimensional excitation, but long RF pulse durations limit practical application. A recent approach to reduce RF pulse duration is based on parallel excitation through multiple RF channels. Here, an alternative approach to shorten multidimensional excitation is proposed that makes use of nonlinear spatial variations in the stationary ( B 0 ) magnetic field during a B 0 ‐sensitive excitation pulse. As initial demonstration, the method was applied to 2D gradient echo (GE) MRI of human brain at 7 T. Using B 0 shims with up to second‐order spatial dependence, it is demonstrated that root‐mean‐squared flip angle variation can be reduced from 20 to 11% with RF pulse lengths that are practical for general GE imaging applications without requiring parallel excitation. The method is expected to improve contrast and sensitivity in GE MRI of human brain at high field. Magn Reson Med, 2012. © 2011 Wiley Periodicals, Inc.