Single-shot, variable flip-angle slice-selective excitation with four gradient-modulated adiabatic half-passage segments
✍ Scribed by Edward W. Hsu; Scott B. Reeder; James R. MacFall
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 655 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Abstract
Adiabatic pulses, although useful in generating uniform spin nutation in the presence of inhomogeneous B~1~ fields, are limited for NMR imaging applications due to the lack of slice‐selective excitation capability. Selective excitation techniques using gradient modulation have been introduced; however, present methods require either a minimum of two excitations or eight adiabatic segments. Here, a scheme is presented that allows single‐shot, arbitrary flip‐angle, and slice‐selective excitation with only four adiabatic half‐passage segments. The technique is demonstrated via computer simulation and experimental tests on a phantom. Furthermore, issues associated with the implementation of these gradient‐modulated adiabatic pulses are discussed.