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Dean-Ben, X.L. ; Pang, G.A. ; de Espinosa, F.M.* ; Razansky, D.

Non-contact optoacoustic imaging by raster scanning a piezoelectric air-coupled transducer.

Proc. SPIE 9708:97081W (2016)
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Optoacoustic techniques rely on ultrasound transmission between optical absorbers within tissues and the measurement location. Much like in echography, commonly used piezoelectric transducers require either direct contact with the tissue or through a liquid coupling medium. The contact nature of this detection approach then represents a disadvantage of standard optoacoustic systems with respect to other imaging modalities (including optical techniques) in applications where non-contact imaging is needed, e.g. in open surgeries or when burns or other lesions are present in the skin. Herein, non-contact optoacoustic imaging using raster-scanning of a spherically-focused piezoelectric air-coupled ultrasound transducer is demonstrated. When employing laser fluence levels not exceeding the maximal permissible human exposure, it is shown possible to attain detectable signals from objects as small as 1 mm having absorption properties representative of blood at near-infrared wavelengths with a relatively low number of averages. Optoacoustic images from vessel-mimicking tubes embedded in an agar phantom are further showcased. The initial results indicate that the air-coupled ultrasound detection approach can be potentially made suitable for non-contact biomedical imaging with optoacoustics.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
ISSN (print) / ISBN 0277-786X
e-ISSN 1996-756X
Conference Title Photons Plus Ultrasound: Imaging and Sensing 2016
Conference Date 14-17 February 2017
Conference Location San Francisco, CA, USA
Journal Proceedings of SPIE
Quellenangaben Volume: 9708, Issue: , Pages: , Article Number: 97081W Supplement: ,
Publisher SPIE
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Biological and Medical Imaging (IBMI)