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Proceedings Paper

Photoacoustic tomography with integrating fiber-based annular detectors
Author(s): H. Grün; H. Altmisdört; T. Berer; G. Paltauf; G. Zangerl; M. Haltmeier; P. Burgholzer
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Paper Abstract

Photoacoustic tomography is an emerging technology combining the advantages of optical imaging (high contrast) and ultrasonic imaging (high spatial resolution). Applications for photoacoustic tomography are mainly in imaging soft tissue. For photoacoustic imaging the sample is illuminated by a short pulse of electromagnetic energy. Depending on the specific absorption rate (SAR) the electromagnetic radiation is absorbed and the subsequent thermoelastic expansion launches broadband ultrasonic waves. Usually point like piezo-electric detectors are used. Our group introduced integrating detectors a few years ago. This type of detector integrates the pressure at least along one dimension. Integrating line detectors, which integrate the pressure along one dimension, can be realized by using either free-beam or fiber-based interferometers. The latter approach also allows other detector shapes than a line. In this paper we use a fiber-based annular detector for tomography. Thereby the sample is rotated inside the annular detector on a position different from the symmetry axis of the annular detector. Hence the sample is enclosed by the detector and all data from one plane are collected at once. By moving the detector parallel to the symmetrie axis of the ring one can acquire data for a 3D image reconstruction. Therfore, tomography can be performed with only one rotation axis and one translation axis. For image reconstruction a novel algorithm is necessary which was tested on simulated data. Here we present an imaging setup using such a fiber-based annular detector. First measurements of simple structures and subsequent image reconstruction from these real data are shown in this paper.

Paper Details

Date Published: 25 March 2011
PDF: 8 pages
Proc. SPIE 7968, Medical Imaging 2011: Ultrasonic Imaging, Tomography, and Therapy, 79680B (25 March 2011); doi: 10.1117/12.877980
Show Author Affiliations
H. Grün, RECENDT GmbH (Austria)
H. Altmisdört, RECENDT GmbH (Austria)
T. Berer, RECENDT GmbH (Austria)
G. Paltauf, Karl-Franzens-Univ. Graz (Austria)
G. Zangerl, Univ. of Vienna (Austria)
M. Haltmeier, Univ. of Vienna (Austria)
P. Burgholzer, RECENDT GmbH (Austria)

Published in SPIE Proceedings Vol. 7968:
Medical Imaging 2011: Ultrasonic Imaging, Tomography, and Therapy
Jan D'hooge; Marvin M. Doyley, Editor(s)

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