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Proceedings Paper

Chirped or time modulated excitation compared to short pulses for photoacoustic imaging in acoustic attenuating media
Author(s): P. Burgholzer; C. Motz; O. Lang; T. Berer; M. Huemer
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Paper Abstract

In photoacoustic imaging, optically generated acoustic waves transport the information about embedded structures to the sample surface. Usually, short laser pulses are used for the acoustic excitation. Acoustic attenuation increases for higher frequencies, which reduces the bandwidth and limits the spatial resolution. One could think of more efficient waveforms than single short pulses, such as pseudo noise codes, chirped, or harmonic excitation, which could enable a higher information-transfer from the samples interior to its surface by acoustic waves. We used a linear state space model to discretize the wave equation, such as the Stoke’s equation, but this method could be used for any other linear wave equation. Linear estimators and a non-linear function inversion were applied to the measured surface data, for onedimensional image reconstruction. The proposed estimation method allows optimizing the temporal modulation of the excitation laser such that the accuracy and spatial resolution of the reconstructed image is maximized. We have restricted ourselves to one-dimensional models, as for higher dimensions the one-dimensional reconstruction, which corresponds to the acoustic wave without attenuation, can be used as input for any ultrasound imaging method, such as back-projection or time-reversal method.

Paper Details

Date Published: 19 February 2018
PDF: 7 pages
Proc. SPIE 10494, Photons Plus Ultrasound: Imaging and Sensing 2018, 104941V (19 February 2018); doi: 10.1117/12.2287451
Show Author Affiliations
P. Burgholzer, Research Ctr. for Non Destructive Testing GmbH (Austria)
C. Motz, Johannes Kepler Univ. Linz (Austria)
O. Lang, Johannes Kepler Univ. Linz (Austria)
T. Berer, Research Ctr. for Non Destructive Testing GmbH (Austria)
M. Huemer, Johannes Kepler Univ. Linz (Austria)

Published in SPIE Proceedings Vol. 10494:
Photons Plus Ultrasound: Imaging and Sensing 2018
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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