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Correction for acceleration‐induced displacement artifacts in phase contrast imaging
Author(s) -
Thunberg Per,
Wigström Lars,
Wranne Bengt,
Engvall Jan,
Karlsson Matts
Publication year - 2000
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/(sici)1522-2594(200005)43:5<734::aid-mrm16>3.0.co;2-a
Subject(s) - acceleration , streamlines, streaklines, and pathlines , artifact (error) , imaging phantom , displacement (psychology) , flow velocity , physics , flow (mathematics) , phase (matter) , nuclear magnetic resonance , computer science , optics , mechanics , artificial intelligence , classical mechanics , psychology , quantum mechanics , psychotherapist
The acceleration‐induced displacement artifact impairs the accuracy of MR velocity measurements. This study proposes a post processing method for correction of this artifact. Velocity measurements were performed in a flow phantom containing a constriction. Velocity curves were obtained from streamlines parallel to the frequency, phase, and slice directions, respectively. The acceleration‐induced displacement artifact was most prominent when the frequency encoding direction was aligned with the flow direction. After correction, velocity assignment improved and a more accurate description of the flow was obtained. In vivo measurements were performed in the aorta in a patient with a repaired aortic coarctation. The correction method was applied to velocity data along a streamline parallel to the frequency encoding direction. The result after correction was a new location of the peak velocity and improved estimates of the velocity gradients. Magn Reson Med 43:734–738, 2000. © 2000 Wiley‐Liss, Inc.