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Conference Papers Year : 2019

Calibrationless oscar-based image reconstruction in compressed sensing parallel MRI

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.
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Dates and versions

hal-02101262 , version 1 (16-04-2019)

Identifiers

Cite

Loubna El Gueddari, Philippe Ciuciu, Emilie Chouzenoux, Alexandre Vignaud, Jean-Christophe Pesquet. Calibrationless oscar-based image reconstruction in compressed sensing parallel MRI. ISBI 2019 - IEEE International Symposium on Biomedical Imaging, Apr 2019, Venise, Italy. ⟨10.1109/isbi.2019.8759393⟩. ⟨hal-02101262⟩
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