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Quantitative measurement of velocity at multiple positions using comb excitation and fourier velocity encoding
Author(s) -
Dumoulin C. L.,
Doorly D. J.,
Caro C. G.
Publication year - 1993
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.1910290110
Subject(s) - fourier transform , excitation , spins , physics , pulsatile flow , pulse (music) , offset (computer science) , fourier analysis , position (finance) , optics , group velocity , pulse sequence , phase (matter) , encoding (memory) , nuclear magnetic resonance , computer science , medicine , finance , quantum mechanics , detector , economics , cardiology , programming language , condensed matter physics , artificial intelligence
An MR imaging technique that simultaneously acquires Fourier velocity encoded data from multiple stations is described. The technique employs a comb excitation rf pulse that excites an arbitrary number of slices. As the Fourier velocity phase encoding gradient pulse is advanced, the phase of each slice is the comb is advanced by a unique amount. This causes the signals from the spins in a particular slice to appear at a position in the phase encoding direction, which is the sum of the spin velocity and an offset arising from the phase increment given to that excitation slice. Acquisition of spin velocity information occurs simultaneously for all slices, permitting the calculation of wave velocities arising from pulsatile flow. These wave velocities can then be used to determine vessel distensibility.