Share Email Print

Proceedings Paper

Ultra-thin spectral filter for acousto-optic imaging for medical applications (Conference Presentation)
Author(s): Caroline Venet; Maïmouna Bocoum; Jean-Baptiste Laudereau; Thierry Chanelière; François Ramaz; Anne Louchet-Chauvet
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Imaging and identifying early metastases is, to this day, not an easy task: using MRI is expensive and ultrasound is not able to discriminate healthy and diseased tissues. Coupling ultrasound imaging to acousto-optic imaging could be a solution: the additional optical contrast would suppress the indetermination on the origin of the biological tissue. Acousto-optic imaging is a multi-wave technique which localizes light in highly scattering medium thanks to an acoustic wave: the acousto-optic effect creates frequency-shifted light, carrying local information about the insonified volume. The central challenge of acousto-optic imaging is the detection of the frequency-shifted light, because there are only very few modulated photons and they create a speckle pattern. We choose to explore the detection by spectral filtering using the spectral hole burning phenomenon in a rare earth doped crystal [1]. This filtering technique is intrinsically immune to speckle decorrelation and therefore well adapted to in vivo imaging. We use a YAG crystal doped with thulium ions under a magnetic field which increases the lifetime of the spectral hole from 10ms to more than a minute. We have undertaken a spectroscopic study to optimize the hole preparation sequence. We will present the first acousto-optic images achieved with a long-lived spectral filter in Tm:YAG, in a scattering medium. [1] Li, Y., Zhang, H., Kim, C., Wagner, K. H., Hemmer, P., & Wang, L. V. (2008). Applied Physics Letters, 93(1), 011111.

Paper Details

Date Published: 15 March 2018
Proc. SPIE 10494, Photons Plus Ultrasound: Imaging and Sensing 2018, 104941S (15 March 2018); doi: 10.1117/12.2285841
Show Author Affiliations
Caroline Venet, Institut Langevin (France)
Maïmouna Bocoum, Institut Langevin (France)
Jean-Baptiste Laudereau, Institut Langevin (France)
Thierry Chanelière, Lab. Aimé Cotton (France)
François Ramaz, Institut Langevin (France)
Anne Louchet-Chauvet, Lab. Aimé Cotton (France)

Published in SPIE Proceedings Vol. 10494:
Photons Plus Ultrasound: Imaging and Sensing 2018
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

© SPIE. Terms of Use
Back to Top