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Peak velocity determination using fast Fourier velocity encoding with minimal spatial encoding
Author(s) -
Galea Daniela,
Lauzon M. Louis,
Drangova Maria
Publication year - 2002
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.1494829
Subject(s) - pulsatile flow , imaging phantom , fourier transform , flow velocity , encoding (memory) , fourier analysis , optics , orientation (vector space) , image resolution , flow (mathematics) , physics , mathematics , computer science , geometry , mathematical analysis , artificial intelligence , medicine , cardiology
For quantitative peak velocity determination, a technique was developed that uses Fourier velocity encoding (FVE) for the fast acquisition of images of velocity with no spatial encoding other than slice selection. The technique produces images of velocity versus temporal frequency. In applications where the quantity of interest is the peak velocity and in‐plane spatial localization is not required, high SNR images are produced with reduced sensitivity to errors due to slice thickness and motion. The technique was validated using steady and pulsatile flow in a straight tube, and compared to both phase contrast measurements and numerical models using steady flow in a 50% and a 75% cosinusoidal stenosis phantom. Results show that for slices as large as 2 cm and/or undergoing periodic motion, FVE can accurately measure the peak velocity in cases where a distribution of velocities exist.