Velocity-selective excitation: Principles and applications

Zungho Zun, Taehoon Shin

Research output: Contribution to journalReview articlepeer-review

1 Scopus citations

Abstract

Velocity-selective (VS) excitation is a relatively new type of excitation that can be useful for generating image contrast based on spin's motion. This review aims to explain the principles of VS excitation and their utilization for clinical applications. We first review the generalized excitation k-space formalism, which reveals a Fourier relationship between sequence parameters and excitation profiles for spins with arbitrary spatial location, off-resonance, and velocity. Based on the k-space framework, we analyze practical VS excitation pulse sequences that yield sinusoidal or sinc-shaped velocity profiles. Then we demonstrate how these two types of VS excitation can be used as magnetization preparation for clinical applications, including saturation- or inversion-based arterial spin labeling and black- or bright-blood angiography. We also discuss practical considerations and issues for each application, including the determination of design parameters and the effects of MR system errors, such as magnetic field offsets and eddy currents.

Original languageEnglish
Article numbere4820
JournalNMR in Biomedicine
Volume36
Issue number2
DOIs
StatePublished - Feb 2023

Bibliographical note

Publisher Copyright:
© 2022 John Wiley & Sons Ltd.

Keywords

  • RF design
  • angiography
  • arterial spin labeling
  • excitation k-space
  • velocity-selective

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