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Effect of acquisition parameters on the accuracy of velocity encoded cine magnetic resonance imaging blood flow measurements
Author(s) -
Greil Gerald,
Geva Tal,
Maier Stephan E.,
Powell Andrew J.
Publication year - 2002
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.10029
Subject(s) - pulsatile flow , imaging phantom , magnetic resonance imaging , image resolution , flow (mathematics) , biomedical engineering , signal (programming language) , flip angle , flow velocity , nuclear magnetic resonance , resolution (logic) , blood flow , materials science , temporal resolution , physics , optics , computer science , medicine , radiology , mechanics , artificial intelligence , cardiology , programming language
Purpose To investigate the effect of acquisition parameters on the accuracy of 2D velocity encoded cine magnetic resonance imaging (VEC MRI) flow measurements. Materials and Methods Using a pulsatile flow phantom, through‐plane flow measurements were performed on a flexible vessel made of polyvinyl alcohol cryogel (PVA), a material that mimics the MR signal and biomechanical properties of aortic tissue. Results Repeated VEC MRI flow measurements ( N = 20) under baseline conditions yielded an error of 0.8 ± 1.5%. Slice thickness, angle between flow and velocity encoding directions, spatial resolution, velocity encoding range, and radio frequency (RF) flip angles were varied over a clinically relevant range. Spatial resolution had the greatest impact on accuracy, with a 9% overestimation of flow at 16 pixels per vessel cross‐section. Conclusion VEC MRI proved to be an accurate and reproducible technique for pulsatile flow measurements over the range of acquisition parameters examined as long as sufficient spatial resolution was prescribed. J. Magn. Reson. Imaging 2002;15:47–54. © 2002 Wiley‐Liss, Inc.