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Proceedings Paper

Remote photoacoustic imaging on non-flat surfaces and appropriate reconstruction algorithms
Author(s): T. Berer; A. Hochreiner; H. Roitner; H. Grün; P. Burgholzer
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Paper Abstract

The recently introduced remote photoacoustic imaging technique allows measurement of photoacoustic signals on nonplanar surfaces without the need for a water bath or coupling agent. Hereby, photoacoustically generated ultrasonic displacements are detected without physical contact to the sample by utilizing laser interferometric techniques. In this work we adapted different algorithms to allow reconstruction on non-planar surfaces and evaluate them on experimental and simulated data. Experimental data were obtained using a remote photoacoustic setup based on two-wave mixing in a photorefractive crystal. Ultrasonic displacements were acquired on flat and non-flat surfaces. Three-dimensional reconstruction of simulated and real measurement data is shown with synthetic aperture focusing technique, Fourier domain synthetic aperture focusing technique, and spectral-domain time reversal algorithms. For the synthetic aperture focusing technique and the time reversal algorithm the surface morphology is taken into account. It is demonstrated that artifacts can occur if the surface is not considered. For the experimental data the shape of the surface is obtained from optical coherence tomography or by a priori knowledge.

Paper Details

Date Published: 4 March 2013
PDF: 9 pages
Proc. SPIE 8581, Photons Plus Ultrasound: Imaging and Sensing 2013, 858134 (4 March 2013); doi: 10.1117/12.2003566
Show Author Affiliations
T. Berer, Christian Doppler Lab. for Photoacoustic Imaging and Laser Ultrasonics (Austria)
Research Ctr. for Non Destructive Testing GmbH (Austria)
A. Hochreiner, Research Ctr. for Non Destructive Testing GmbH (Austria)
H. Roitner, Research Ctr. for Non Destructive Testing GmbH (Austria)
H. Grün, Research Ctr. for Non Destructive Testing GmbH (Austria)
P. Burgholzer, Christian Doppler Lab. for Photoacoustic Imaging and Laser Ultrasonics (Austria)
Research Ctr. for Non Destructive Testing GmbH (Austria)


Published in SPIE Proceedings Vol. 8581:
Photons Plus Ultrasound: Imaging and Sensing 2013
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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