Premium
High‐precision MR velocity mapping by 3D‐fourier phase encoding with a small number of encoding steps
Author(s) -
Bittoun Jacques,
Bourroul Eric,
Jolivet Odile,
IdyPeretti Ilana,
Mousseaux Elie,
Tardivon Anne,
Peronneau Pierre
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.1910290515
Subject(s) - encoding (memory) , interpolation (computer graphics) , imaging phantom , fourier transform , fourier analysis , algorithm , mathematics , computer science , computer vision , physics , artificial intelligence , optics , mathematical analysis , image (mathematics)
The final result of Fourier velocity mapping is a set of images, each representing the spatial distribution of spins at a given velocity. To acquire data in a short time, the number of encoding gradient steps must be as small as possible, but this can mean sacrificing velocity resolution. We used interpolation methods to obtain high velocity resolution with a small number of encoding steps involving linear interpolation from 16 encoding steps or more and zero‐filling interpolation from two to eight encoding steps. Velocity measured by interpolated Fourier‐flow encoding agreed well with values obtained using a calibrated phantom. A simulation of noise on the images of the phantom showed that, for a given acquisition time, increasing number of encoding steps in the Fourier flow encoding gave better precision for velocity measurement than did averaging identical signals in phase‐mapping methods.