Abstract : Reducing acquisition time is a crucial issue in MRI especially in the high resolution context. Compressed sensing has faced this problem for a decade. However, to maintain a high signal-to-noise ratio (SNR), CS must be combined with parallel imaging. This leads to harder reconstruction problems that usually require the knowledge of coil sensitivity profiles. In this work, we introduce a calibra-tionless image reconstruction approach that no longer requires this knowledge. The originality of this work lies in using for reconstruction a group sparsity structure (called OSCAR) across channels that handles SNR inhomogeneities across receivers. We compare this reconstruction with other calibrationless approaches based on group-LASSO and its sparse variation as well as with the auto-calibrated method called 1-ESPIRiT. We demonstrate that OSCAR outper-forms its competitors and provides similar results to 1-ESPIRiT. This suggests that the sensitivity maps are no longer required to perform combined CS and parallel imaging reconstruction.
https://hal.inria.fr/hal-02101262
Contributor : Philippe Ciuciu
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Submitted on : Tuesday, April 16, 2019 - 3:53:27 PM
Last modification on : Saturday, April 20, 2019 - 1:29:12 AM
L El Gueddari, P. Ciuciu, E Chouzenoux, A. Vignaud, J.-C Pesquet. Calibrationless oscar-based image reconstruction in compressed sensing parallel MRI. IEEE International Symposium on Biomedical Imaging, Apr 2019, Venise, Italy. ⟨hal-02101262⟩
