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Quantitative phase‐contrast flow MRI measurements in the presence of a second vessel closely positioned to the examined vessel
Author(s) -
Lagerstrand Kerstin M.,
VikhoffBaaz Barbro,
Starck Göran,
ForssellAronsson Eva
Publication year - 2006
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.20498
Subject(s) - flow (mathematics) , imaging phantom , phase contrast microscopy , sampling (signal processing) , contrast (vision) , signal (programming language) , position (finance) , biomedical engineering , flow velocity , materials science , nuclear magnetic resonance , nuclear medicine , physics , mechanics , computer science , optics , medicine , finance , detector , economics , programming language
Purpose To examine the influence of the truncated sampling of k ‐space data on the accuracy of phase‐contrast (PC) flow quantifications in the presence of nearby vessels. Materials and Methods Computer simulations were performed along with some experimental validations on a flow phantom and a normal subject. Results The accuracy of the PC flow quantification decreased when a second vessel was positioned closely to the examined vessel. The effect strongly depended on the peak flow velocity in the second vessel relative to the velocity encoding (venc) level of the MRI acquisition, and on the position and area of the second vessel. Conclusion Due to the truncated sampling of the k ‐space data, signal leaked from nearby vessels and distorted the PC flow quantification in the examined vessel. The presented results suggest specific experimental conditions to minimize this flow quantification error. J. Magn. Reson. Imaging 2006. © 2006 Wiley‐Liss, Inc.