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Proceedings Paper

Spectral optoacoustic imaging using a wavelength-multiplexing technique
Author(s): Guenther Paltauf; Miriam Steininger
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Paper Abstract

Spectral optoacoustic imaging uses two or more optical wavelengths for the excitation of ultrasonic waves in order to obtain spectrally resolved images of tissue. We developed a wavelength-multiplexing method that enables the simultaneous generation and detection of optoacoustic waves with two optical wavelengths emitted from a pump laser - optical parametric oscillator system. Two-dimensional images were taken with a linearly scanning optoacoustic transducer from phantoms and from tissue in vivo. The time required for signal acquisition depended solely on the pulse repetition rate of the laser. At presence, with a 10 Hz system, this time was between 10 and 20 seconds. Pairs of images at two wavelengths show an exact overlap of the imaged structures. Wavelength-dependent variations of optical absorption coefficients are visualized by calculating ratio and difference images. The presented experimental results demonstrate the feasibility of the method to generate maps of blood oxygenation.

Paper Details

Date Published: 12 July 2004
PDF: 10 pages
Proc. SPIE 5320, Photons Plus Ultrasound: Imaging and Sensing, (12 July 2004); doi: 10.1117/12.536698
Show Author Affiliations
Guenther Paltauf, Karl-Franzens-Univ. Graz (Austria)
Miriam Steininger, Karl-Franzens-Univ. Graz (Austria)

Published in SPIE Proceedings Vol. 5320:
Photons Plus Ultrasound: Imaging and Sensing
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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