Pol Grasland-Mongrain edited The_maximum_displace.tex  almost 9 years ago

Commit id: d19707d70633f07d094dc1a41bc63eb798689e5b

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However, there could be some particular applications where current probes prove unsuitable. A laser probe could control easily the shear wave shape (focusing capabilities for example, see for example \cite{noroy1993laser}), with an high speed repetition rate.  The laser have also the advantage to be non-contact and totally remote. For example, Li et al. have proposed to induce surface acoustic waves by laser to measure elastic properties of biological thin layers like skin \cite{li2011elastic},\cite{li2012noncontact}  or cornea\cite{li2011elastic},\cite{li2012noncontact},  \cite{li2014laser}. Moreover, the probe used for laser can be made extremely small (smaller than 100 um diameter if required), especially if optical fibres are employed. There could be then an interest for endoscopy, by inducing displacement with a simple optic fibre which can be inserted in small intima or vessels. Additionally, the shear wave source does not emit electromagnetic noise (if the laser device is placed far from the region of interest), so it can be quite convenient for magnetic resonance elastography experiment which is currently using external drivers or expensive non-magnetic ultrasound probes - even if this price needs to be balanced with the one of a laser probe. This study presented observation of elastic shear waves generated in soft tissues using a laser beam. The involved phenomenon was investigated. Experiments in chicken breast sample showed the feasibility of an elastography method using a laser beam as a shear wave source.  The authors would like to thank Damien Garcia for lending the laser device. Pol Grasland-Mongrain received a  FRM SPE20140129460and CRSNG  post-doctoral grants. grant. The authors declare no conflict of interest in the work presented here.