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Influence of eddy current, Maxwell and gradient field corrections on 3D flow visualization of 3D CINE PC‐MRI data
Author(s) -
Lorenz Ramona,
Bock Jelena,
Snyder Jeff,
Korvink Jan G.,
Jung Bernd A.,
Markl Michael
Publication year - 2014
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.24885
Subject(s) - offset (computer science) , visualization , phase contrast microscopy , eddy current , electromagnetic coil , scanner , biomedical engineering , nuclear magnetic resonance , physics , vector field , magnetic field , flow visualization , sensitivity (control systems) , computer science , mechanics , flow (mathematics) , optics , artificial intelligence , medicine , engineering , electronic engineering , quantum mechanics , programming language
Purpose The measurement of velocities based on phase contrast MRI can be subject to different phase offset errors which can affect the accuracy of velocity data. The purpose of this study was to determine the impact of these inaccuracies and to evaluate different correction strategies on three‐dimensional visualization. Methods Phase contrast MRI was performed on a 3 T system (Siemens Trio) for in vitro (curved/straight tube models; venc: 0.3 m/s) and in vivo (aorta/intracranial vasculature; venc: 1.5/0.4 m/s) data. For comparison of the impact of different magnetic field gradient designs, in vitro data was additionally acquired on a wide bore 1.5 T system (Siemens Espree). Different correction methods were applied to correct for eddy currents, Maxwell terms, and gradient field inhomogeneities. Results The application of phase offset correction methods lead to an improvement of three‐dimensional particle trace visualization and count. The most pronounced differences were found for in vivo/in vitro data (68%/82% more particle traces) acquired with a low venc (0.3 m/s/0.4 m/s, respectively). In vivo data acquired with high venc (1.5 m/s) showed noticeable but only minor improvement. Conclusion This study suggests that the correction of phase offset errors can be important for a more reliable visualization of particle traces but is strongly dependent on the velocity sensitivity, object geometry, and gradient coil design. Magn Reson Med 72:33–40, 2014. © 2013 Wiley Periodicals, Inc.