Please use this identifier to cite or link to this item: http://ktisis.cut.ac.cy/handle/10488/7595
Title: Correction of temporal misregistration artifacts in jet flow by conventional phase-contrast MRI
Authors: Doyle, Mark W. 
Kortright, Eduardo 
Anayiotos, Andreas 
Keywords: Data processing
Jets--Fluid dynamics
k-spaces
Magnetic resonance imaging
Issue Date: 2007
Publisher: Wiley-Blackwell
Source: Journal of Magnetic Resonance Imaging, 2007, Volume 25, Issue 6, Pages 1256–1262
Abstract: Purpose: To show that accuracy of jet flow representation by magnetic resonance (MR) phase-contrast (PC) velocity-encoded (VE) cine imaging is dominated by error terms resulting from the temporal distribution of data, and to present a generally applicable data interpolation-based approach to correct for this phenomenon. Materials and Methods: Phase-contrast data were acquired in a stenotic orifice flow phantom using a physiologic pulsatile flow waveform. A temporally registered scan, acquired without data segmentation or interleaving was obtained (17 minutes) and taken as the reference (REF). Conventional PC data sets were acquired using segmentation and data interleaving. An enhanced temporal registration (ETR) algorithm was applied to the acquired data to temporally interpolate component sets and output data at matching time points, thereby reducing temporal dispersion. Results: Compared to the REF data, conventionally processed PC data consistently overestimated peak velocities in laminar jet flow regions (127% ± 28%) and exhibited relatively weak correlations (r = 0.67 ± 0.23). The ETR-processed data better represented peak velocities (101% ± 13%, P < 0.001) and correlated more closely with the REF data (r = 0.94 ± 0.05. P < 0.001). Conclusion: The temporal distribution of PC data impacts the accuracy of velocity representation in pulsatile jet flow. A temporal registration postprocessing algorithm can minimize loss of accuracy.
URI: http://ktisis.cut.ac.cy/handle/10488/7595
ISSN: 10531807
DOI: 10.1002/jmri.20926
Rights: © 2007 Wiley-Liss, Inc
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