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Correction of temporal misregistration artifacts in jet flow by conventional phase‐contrast MRI
Author(s) -
Doyle Mark,
Kortright Eduardo,
Anayiotos Andreas S.,
Rayarao Geetha,
Rathi Vikas K.,
Caruppannan Kethes,
Li Longchuan,
Biederman Robert W.W.
Publication year - 2007
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.20926
Subject(s) - jet (fluid) , initialization , contrast (vision) , flow (mathematics) , computer science , laminar flow , segmentation , temporal resolution , data set , pulsatile flow , imaging phantom , interleaving , artificial intelligence , physics , optics , medicine , mechanics , thermodynamics , programming language , operating system , cardiology
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. J. Magn. Reson. Imaging 2007;25:1256–1262. © 2007 Wiley‐Liss, Inc.