Photoacoustic projection imaging using a 64-channel fiber optic detector array

Johannes Bauer-Marschallinger; Karoline Felbermayer; Klaus-Dieter Bouchal; Istvan A. Veres; Hubert Grün; Peter Burgholzer; Thomas Berer

doi:10.1117/12.2077206

11 March 2015 Photoacoustic projection imaging using a 64-channel fiber optic detector array

Johannes Bauer-Marschallinger, Karoline Felbermayer, Klaus-Dieter Bouchal, Istvan A. Veres, Hubert Grün, Peter Burgholzer, Thomas Berer

Author Affiliations +

Proceedings Volume 9323, Photons Plus Ultrasound: Imaging and Sensing 2015; 93233U (2015) https://doi.org/10.1117/12.2077206
Event: SPIE BiOS, 2015, San Francisco, California, United States

Abstract

In this work we present photoacoustic projection imaging with a 64-channel integrating line detector array, which average the pressure over cylindrical surfaces. For imaging, the line detectors are arranged parallel to each other on a cylindrical surface surrounding a specimen. Thereby, the three-dimensional imaging problem is reduced to a twodimensional problem, facilitating projection imaging. After acquisition of a dataset of pressure signals, a twodimensional photoacoustic projection image is reconstructed. The 64 channel line detector array is realized using optical fibers being part of interferometers. The parts of the interferometers used to detect the ultrasonic pressure waves consist of graded-index polymer-optical fibers (POFs), which exhibit better sensitivity than standard glass-optical fibers. Ultrasonic waves impinging on the POFs change the phase of light in the fiber-core due to the strain-optic effect. This phase shifts, representing the pressure signals, are demodulated using high-bandwidth balanced photo-detectors. The 64 detectors are optically multiplexed to 16 detection channels, thereby allowing fast imaging. Results are shown on a Rhodamine B dyed microsphere.

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Johannes Bauer-Marschallinger, Karoline Felbermayer, Klaus-Dieter Bouchal, Istvan A. Veres, Hubert Grün, Peter Burgholzer, and Thomas Berer "Photoacoustic projection imaging using a 64-channel fiber optic detector array", Proc. SPIE 9323, Photons Plus Ultrasound: Imaging and Sensing 2015, 93233U (11 March 2015); https://doi.org/10.1117/12.2077206

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