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

Michael Mullen; Naoharu Kobayashi; Michael Garwood

doi:10.1016/j.jmr.2018.12.017

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

Michael Mullen, Naoharu Kobayashi, Michael Garwood

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

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 language	English (US)
Pages (from-to)	93-100
Number of pages	8
Journal	Journal of Magnetic Resonance
Volume	299
DOIs	https://doi.org/10.1016/j.jmr.2018.12.017
State	Published - 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.

Keywords

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

Publisher link

10.1016/j.jmr.2018.12.017

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6369020

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Cite this

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title = "Two-dimensional frequency-swept pulse with resilience to both B1 and B0 inhomogeneity",

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.",

keywords = "2D pulse, Adiabatic pulse, B0 inhomogeneity, B1 inhomogeneity, Frequency-modulated, MRI, Radiofrequency pulse",

author = "Michael Mullen and Naoharu Kobayashi and Michael Garwood",

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: {\textcopyright} 2018 Elsevier Inc.",

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AU - Mullen, Michael

AU - Kobayashi, Naoharu

AU - Garwood, Michael

N1 - 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.

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AB - 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.

KW - 2D pulse

KW - Adiabatic pulse

KW - B0 inhomogeneity

KW - B1 inhomogeneity

KW - Frequency-modulated

KW - MRI

KW - Radiofrequency pulse

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