Pencil excitation with interleaved fourier velocity encoding: NMR measurement of aortic distensibility
✍ Scribed by Christopher J. Hardy; Bradley D. Bolster Jr.; Elliot R. McVeigh; Icko E. T. Iben; Elias A. Zerhouni
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 640 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
Abstract
A technique is presented for rapidly and noninvasively determining aortic distensibiltty, by NMR measurement of pulse‐wave velocrty in the aorta. A cylinder of magnetization is excited along the aorta, wtth Fourier‐veloctty encoding and readout gradients applied along the cylinder axis. Cardiac gating and data interleaving improve the effective time resolution to as high as 3 ms. Wave velocities are determined from the position of the f oot of the flow wave in the velocity profiles. Evidence of helical flow distal to the aortic arch can be seen in normal subjects, while disturbed flow patterns are visible in patients with aneurysms and dissections.