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Multilattice sampling strategies for region of interest dynamic MRI
Author(s) -
Rilling Gabriel,
Tao Yuehui,
Marshall Ian,
Davies Mike E.
Publication year - 2013
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.24471
Subject(s) - undersampling , sampling (signal processing) , acceleration , computer science , lattice (music) , algorithm , slice sampling , artificial intelligence , computer vision , physics , acoustics , filter (signal processing) , bayesian probability , classical mechanics , markov chain monte carlo
A multilattice sampling approach is proposed for dynamic MRI with Cartesian trajectories. It relies on the use of sampling patterns composed of several different lattices and exploits an image model where only some parts of the image are dynamic, whereas the rest is assumed static. Given the parameters of such an image model, the methodology followed for the design of a multilattice sampling pattern adapted to the model is described. The multi‐lattice approach is compared to single‐lattice sampling, as used by traditional acceleration methods such as UNFOLD (UNaliasing by Fourier‐Encoding the Overlaps using the temporal Dimension) or k‐t BLAST, and random sampling used by modern compressed sensing‐based methods. On the considered image model, it allows more flexibility and higher accelerations than lattice sampling and better performance than random sampling. The method is illustrated on a phase‐contrast carotid blood velocity mapping MR experiment. Combining the multilattice approach with the KEYHOLE technique allows up to 12× acceleration factors. Simulation and in vivo undersampling results validate the method. Compared to lattice and random sampling, multilattice sampling provides significant gains at high acceleration factors. Magn Reson Med 70:392–403, 2013. © 2012 Wiley Periodicals, Inc.