Photoacoustic reconstruction from photothermal measurements including prior information
Publikation, 2020
Outline
G. Thummerer, G. Mayr, M. Haltmeier, P. Burgholzer - Photoacoustic reconstruction from photothermal measurements including prior information - Photoacoustics, 2020, pp. 8
Abstract
Photothermal measurements with an infrared camera enable a fast and contactless part inspection. The main
drawback of existing reconstruction methods is the degradation of the spatial resolution with increasing imaging
depth, which results in blurred images for deeper lying structures. In this paper, we propose an efficient image
reconstruction strategy that allows prior information to be included to overcome the diffusion-based information
loss. Following the virtual wave concept, in a first step we reconstruct an acoustic wave field that satisfies the
standard wave equation. Therefore, in the second step, stable and efficient reconstruction methods developed for
photoacoustic tomography can be used. We compensate for the loss of information in thermal measurements by
incorporating the prior information positivity and sparsity. Therefore, we combine circular projections with an
iterative regularization scheme. Using simulated and experimental data, this work demonstrates that the quality
of the reconstruction from photothermal measurements can be significantly enhanced.
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