Variable Density Compressed Sensing In MRI. Theoretical vs Heuristic Sampling Strategies

Nicolas Chauffert 1, * Philippe Ciuciu 1 Pierre Weiss 2
* Auteur correspondant
1 PARIETAL - Modelling brain structure, function and variability based on high-field MRI data
NEUROSPIN - Service NEUROSPIN, Inria Saclay - Ile de France
2 PRIMO, ITAV, UMS3039
ITAV - Institut des Technologies Avancées en sciences du Vivant
Abstract : The structure of Magnetic Resonance Images (MRI) and especially their compressibility in an appropriate representation basis enables the application of the compressive sensing theory, which guarantees exact image recovery from incomplete measurements. According to recent theoretical conditions on the reconstruction guarantees, the optimal strategy is to downsample the k-space using an independent drawing of the acquisition basis entries. Here, we first bring a novel answer to the synthesis problem, which amounts to deriving the op- timal distribution (according to a given criterion) from which the data should be sampled. Then, given that the sparsity hypothesis is not fulfilled in the k-space center in MRI, we extend this approach by densely sampling this center and drawing the remaining samples from the optimal distribution. We compare this theoretical approach to heuristic strategies, and show that the proposed two-stage process drastically improves reconstruction results on anatomical MRI.
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Communication dans un congrès
ISBI - 10th International Symposium on Biomedical Imaging, Apr 2013, San Francisco, United States. 2013
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Soumis le : jeudi 25 juillet 2013 - 17:36:01
Dernière modification le : vendredi 22 juin 2018 - 01:20:38
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  • HAL Id : hal-00848271, version 1
  • ARXIV : 1307.6836

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Nicolas Chauffert, Philippe Ciuciu, Pierre Weiss. Variable Density Compressed Sensing In MRI. Theoretical vs Heuristic Sampling Strategies. ISBI - 10th International Symposium on Biomedical Imaging, Apr 2013, San Francisco, United States. 2013. 〈hal-00848271〉

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