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Rosenthal, A. ; Kellnberger, S. ; Omar, M. ; Razansky, D. ; Ntziachristos, V.

Wideband optical detector of ultrasound for medical imaging applications.

J. Vis. Exp. 87:e50847 (2014)
DOI PMC
Open Access Green as soon as Postprint is submitted to ZB.
Optical sensors of ultrasound are a promising alternative to piezoelectric techniques, as has been recently demonstrated in the field of optoacoustic imaging. In medical applications, one of the major limitations of optical sensing technology is its susceptibility to environmental conditions, e.g. changes in pressure and temperature, which may saturate the detection. Additionally, the clinical environment often imposes stringent limits on the size and robustness of the sensor. In this work, the combination of pulse interferometry and fiber-based optical sensing is demonstrated for ultrasound detection. Pulse interferometry enables robust performance of the readout system in the presence of rapid variations in the environmental conditions, whereas the use of all-fiber technology leads to a mechanically flexible sensing element compatible with highly demanding medical applications such as intravascular imaging. In order to achieve a short sensor length, a pi-phase-shifted fiber Bragg grating is used, which acts as a resonator trapping light over an effective length of 350 µm. To enable high bandwidth, the sensor is used for sideway detection of ultrasound, which is highly beneficial in circumferential imaging geometries such as intravascular imaging. An optoacoustic imaging setup is used to determine the response of the sensor for acoustic point sources at different positions.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Bioengineering ; Issue 87 ; Ultrasound ; Optical Sensors ; Interferometry ; Pulse Interferometry ; Optical Fibers ; Fiber Bragg Gratings ; Optoacoustic Imaging ; Photoacoustic Imaging; In-vivo; Polymer-film; Fiber; Interferometer; Tomography; Sensor; Organs; Phase
ISSN (print) / ISBN 1940-087X
e-ISSN 1940-087X
Journal Journal of Visualized Experiments
Quellenangaben Volume: 87, Issue: 87, Pages: , Article Number: e50847 Supplement: ,
Publisher JoVE
Publishing Place Cambridge
Reviewing status Peer reviewed
Institute(s) Institute of Biological and Medical Imaging (IBMI)