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Acoustic process tomography is a powerful tool for monitoring multiphase flow and combustion. However, its capability of revealing details of the interrogation zone is restricted by the ill-posed and rank deficiency problems. In each projection, a probing sound beam only passes the pixels along its propagation path, resulting in a large number of zero-valued elements in the measurement matrix. This is more pronounced as the resolution of the imaging zone becomes gradually finer, which isdoi:10.3390/en15093118 doaj:3fe9082cf65e4fcea65ed94c1004f3d8 fatcat:jaivdku66nakndz63oiv62g6de