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Proceedings Paper

Spatial resolution and sensitivity in photoacoustic tomography taking noise into account: from point-like detectors to large integrating detectors
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Paper Abstract

As for any other imaging technique spatial resolution and sensitivity are important features for a photoacoustic imaging device. It is already well known that spatial resolution depends on the size and the bandwidth of the detectors. Therefore for photoacoustic image reconstruction usually small point-like and broadband detectors are assumed, which measure the pressure as a function of time on a detection surface around the sample. But in reality point-like detectors are not ideal at all: because of the small detector volume the thermodynamic fluctuations (= noise) get high and the signal amplitude is low, which results in a bad signal-to-noise ratio (SNR). For a bigger detector volume the fluctuations are less and the signal amplitude is better, which gives a better SNR. But on the other hand the photoacoustic pressure signal is averaged over the whole detector volume, which results in blurring and a reduced spatial resolution if reconstruction algorithms for point-like detectors are used. To characterize this trade-off between spatial resolution and sensitivity for a varying detector volume in a quantitative way the pressure is described by a random variable having the measured pressure as a mean value and noise as random fluctuations around that mean value ("stochastic process"). For a PVDF detector the optimum for the detector size is given.

Paper Details

Date Published: 23 February 2012
PDF: 8 pages
Proc. SPIE 8223, Photons Plus Ultrasound: Imaging and Sensing 2012, 822321 (23 February 2012); doi: 10.1117/12.908451
Show Author Affiliations
Peter Burgholzer, RECENDT GmbH (Austria)
Christian Doppler Lab. for Photoacoustic Imaging and Laser Ultrasonics (Austria)
Thomas Berer, RECENDT GmbH (Austria)
Christian Doppler Lab. for Photoacoustic Imaging and Laser Ultrasonics (Austria)
Hubert Grün, RECENDT GmbH (Austria)
Robert Nuster, Karl-Franzens-Univ. Graz (Austria)
Günther Paltauf, Karl-Franzens-Univ. Graz (Austria)

Published in SPIE Proceedings Vol. 8223:
Photons Plus Ultrasound: Imaging and Sensing 2012
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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