An asymmetric slice profile: Spatial alteration of flow signal response in 3d time-of-flight NMR angiography
✍ Scribed by Tetsuya Matsuda; Isao Morii; Fujimasa Kohno; Reinin Asato; Yoshikazu Ikezaki; Eiji Yoshitome; Shigetake Sasayama
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 718 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Abstract
We introduce an asymmetric slice profile technique, which alters the spatial response of the flow signal in 3D time‐of‐flight NMR angiography. By gradually increasing the flip angle from the inflow to the outflow portions of the slab, the inflow refreshment effect is distributed over a wide slab thickness. The asymmetric slice profile is simply produced by using a Gaussian RF excitation with an overlapping presaturation. The spatial distribution of steady flow signal in a phantom study demonstrated an essential agreement with a numerical simulation. 3D time‐of‐flight NMR angiography of volunteers' heads using this technique provided a smooth vascular depiction over a wide slab thickness.