this is for holding javascript data
Pol Grasland-Mongrain edited When_a_laser_beam_of__1.tex
over 8 years ago
Commit id: 86d973d2a5c853361446c36beb189b6b3677c284
deletions | additions
diff --git a/When_a_laser_beam_of__1.tex b/When_a_laser_beam_of__1.tex
index 7bb00b3..75b1973 100644
--- a/When_a_laser_beam_of__1.tex
+++ b/When_a_laser_beam_of__1.tex
...
In this study, we show that shear waves can be induced in soft tissues by a laser beam, with a model of the underlying physical phenomenon. We also applied the technique in a biological tissue to evaluate its potential application in shear wave elastography.
The Z axis is defined here as the laser beam axis, and the ultrasound imaging plane is in In the
YZ plane, as first experiment, illustrated by Figure
\ref{Figure1}.
In this experiment, \ref{Figure1}, we used a laser beam emitted by a Nd:YAG laser (EverGreen 200, Quantel, Les Ulis, France), which produced a 200 mJ, Q-switched pulse at a central wavelength of 532 nm during 10 ns in a beam of section $S$=20 mm$^2$. The laser beam was absorbed in a 4x8x8 cm$^3$ tissue-mimicking phantom made of water and of 5\% polyvinyl alcohol, 1 \% black graphite powder and 1\% salt. A freezing/thawing cycle was applied to stiffen the material to a value of 15$\pm$5 kPa \cite{17375819}.
The laser was absorbed in the medium with an exponential decay of the optical intensity $I$ along medium depth $r$\cite{scruby1990laser}:
\begin{equation}
I=(1-R)I_0 \exp(- \gamma r)
...