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In vivo comparison of two through‐plane MR velocity mapping methods: Fast fourier encoding and phase mapping
Author(s) -
Mousseaux Elie,
IdyPeretti Iiana,
Bittoun Jacques,
Jolivet Odile,
Bourroul Eric,
Tardivon Anne,
Péronneau Pierre,
Gaux JeanClaude
Publication year - 1994
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880040515
Subject(s) - interpolation (computer graphics) , encoding (memory) , fourier transform , phase (matter) , plane (geometry) , k space , physics , subtraction , computer science , nuclear magnetic resonance , computer vision , artificial intelligence , mathematics , geometry , image (mathematics) , arithmetic , quantum mechanics
Magnetic resonance imaging maps of velocity were acquired with a 1.5‐T system in 10 subjects in a plane perpendicular to the main pulmonary artery. Velocity images were successively acquired with a method developed from Fourier‐encoding velocity imaging (FEVI) principles with eight gradient steps and one excitation, and with two‐point phase‐subtraction mapping. Reconstruction in FEVI was implemented by zero‐filling interpolation around the eight gradient steps and then around the four central steps. The methods were compared by using estimates of noise in velocity measurements based on the difference between the experimental map and a smooth fitted map. For the same acquisition time, FEVI with four encoding steps was more precise in velocity measurements than phase mapping. Precision was further increased by the use of eight encoding steps, but acquisition time was doubled.