Velocity‐selective excitation: Principles and applications
Year: 2022
Type: review
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.
Source: NMR in Biomedicine
DOI: 10.1002/nbm.4820
Authors: Zungho Zun, Taehoon Shin
Language: English
Subfield: Radiology, Nuclear Medicine and Imaging
Field: Medicine
Domain: Health Sciences
Open Access status: green
Funders: National Research Foundation of Korea, National Institutes of Health, National Heart, Lung, and Blood Institute, National Institute of Environmental Health Sciences, National Center for Advancing Translational Sciences, Eunice Kennedy Shriver National Institute of Child Health and Human Development
Awards: G1280984317, Assessment of placental perfusion and oxygenation using novel MRI approaches, G2716853725, G3934193436, NON-CONTRAST-ENHANCED PERIPHERAL MR ANGIOGRAPHY, Clinical and Translational Science Center, (CIRCADIAN) Circadian Disruption as Mediator of Cardiometabolic Risk in Air Pollution
OpenAlex ID: W4292657764