A strategy for sampling on a sphere applied to 3D selective RF pulse design
✍ Scribed by Sam T. S. Wong; Mark S. Roos
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 717 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Abstract
Conventional constant angular velocity sampling of the surface of a sphere results in a higher sampling density near the two poles relative to the equatorial region. More samples, and hence longer sampling time, are required to achieve a given sampling density in the equatorial region when compared with uniform sampling. This paper presents a simple expression for a continuous sample path through a nearly uniform distribution of points on the surface of a sphere. Sampling of concentric spherical shells in k‐space with the new strategy is used to design 3D selective inversion and spin‐echo pulses. These new 3D selective pulses have been implemented and verified experimentally.