Two-dimensional frequency-swept pulse with resilience to both B1 and B0 inhomogeneity

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Abstract

Applications of multidimensional spatially-selective pulses are sometimes limited by their long pulse durations resulting from the need to execute a modulated gradient waveform in concert with RF transmission. Here, we introduce a method to design two-dimensional selective adiabatic pulses using a Cartesian k-space trajectory. The full pulse can be sampled using various undersampled segments to create a multidimensional pulse resilient to large off-resonances. Moreover, the pulse can be designed to be resilient to B1 + inhomogeneity. Experimental demonstrations of fully segmented and single-shot k-space sampling patterns are presented.

Original languageEnglish (US)
Pages (from-to)93-100
Number of pages8
JournalJournal of Magnetic Resonance
Volume299
DOIs
StatePublished - Feb 2019

Bibliographical note

Funding Information:
This work was supported by the National Institutes of Health grants U01 EB025153 , P41 EB015894 , and T32 EB008389 . The authors would like to thank Drs. Jarvis Haupt and Gregor Adriany for useful discussions and for technical assistance.

Publisher Copyright:
© 2018 Elsevier Inc.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

  • 2D pulse
  • Adiabatic pulse
  • B0 inhomogeneity
  • B1 inhomogeneity
  • Frequency-modulated
  • MRI
  • Radiofrequency pulse

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