NDLI: Velocity extraction from spin-tagging MRI images using a weighted least-squares optical flow method

Content Provider	IEEE Xplore Digital Library
Author	Stoitsis, J. Bastouni, E. Karampinos, D.C. Bosshard, J.C. Jiaxi Lu Golemati, S. Wright, S.M. Georgiadis, J.G. Nikita, K.S.
Copyright Year	2007
Description	Author affiliation: Nat. Tech. Univ. of Athens, Athens (Stoitsis, J.; Bastouni, E.)
Abstract	Magnetic resonance imaging (MRI) can provide truly non-invasive measurements of internal flow fields. The extraction of velocity from spin-tagging images requires the quantitative tracking of grid nodes. A weighted least-squares optical flow method was used in this work to estimate the displacements of the grid nodes and tags from synthetic and real spin-tagging MRI images. To investigate the accuracy of the proposed method, synthetic spin-tagging images were generated using the Poiseuille law analytical profile. Three synthetic sequences with different levels of noise were generated and the average and maximum absolute errors were estimated for points corresponding to grid nodes and tags. Different sizes and shapes of region of interest (ROI) were investigated to determine the optimal size and shape for reliable extraction of velocity both for synthetic and real spin-tagging MRI images. The optimal ROI size was found to be 13x13 $pixels^{2}$ . The average and maximum absolute error for the velocity in vertical direction for synthetic data using the optimal ROI size ranged from 5.46% to 14.42% and from 6.39% to 31.96% respectively.
Starting Page	1
Ending Page	5
File Size	1393808
Page Count	5
File Format	PDF
ISBN	1424409640
DOI	10.1109/IST.2007.379577
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-05-05
Publisher Place	Poland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic resonance imaging Image motion analysis Shape Fluid flow measurement Magnetic field measurement Image generation Image analysis Noise shaping Noise generators Noise level weighted least-squares optical flow velocity estimation spin-tagging MRI
Content Type	Text
Resource Type	Article

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