Disjoint sparsity for signal separation and applications to hybrid inverse problems in medical imaging

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• 作者：Giovanni S. Alberti ^{giovanni.alberti@ens.fr} ; Habib Ammari ; ^{habib.ammari@ens.fr}
• 关键词：35R30 ; 65N21 ; 65T60 ; 68U10
• 刊名：Applied and Computational Harmonic Analysis
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：42
• 期：2
• 页码：319-349
• 全文大小：3020 K
• 卷排序：42

文摘

The main focus of this work is the reconstruction of the signals f   and gigi, i=1,…,Ni=1,…,N, from the knowledge of their sums hi=f+gihi=f+gi, under the assumption that f   and the gigi's can be sparsely represented with respect to two different dictionaries AfAf and AgAg. This generalizes the well-known “morphological component analysis” to a multi-measurement setting. The main result of the paper states that f   and the gigi's can be uniquely and stably reconstructed by finding sparse representations of hihi for every i   with respect to the concatenated dictionary [Af,Ag][Af,Ag], provided that enough incoherent measurements gigi are available. The incoherence is measured in terms of their mutual disjoint sparsity.This method finds applications in the reconstruction procedures of several hybrid imaging inverse problems, where internal data are measured. These measurements usually consist of the main unknown multiplied by other unknown quantities, and so the disjoint sparsity approach can be directly applied. As an example, we show how to apply the method to the reconstruction in quantitative photoacoustic tomography, also in the case when the Grüneisen parameter, the optical absorption and the diffusion coefficient are all unknown.