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Pencil excitation with interleaved fourier velocity encoding: NMR measurement of aortic distensibility
Author(s) -
Hardy Christopher J.,
Bolster Bradley D.,
McVeigh Elliot R.,
Iben Icko E. T.,
Zerhouni Elias A.
Publication year - 1996
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910350605
Subject(s) - fourier transform , aortic arch , aorta , nuclear magnetic resonance , pulse wave velocity , fourier analysis , physics , excitation , materials science , medicine , quantum mechanics , blood pressure
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.