Ultrasonic Time Reversal Technique Used to In-Vivo Investigation of Humen Skin Under Loading

0422546 - ÚT 2014 SG eng A - Abstract
Hradilová, Jana - Tokar, Daniel - Převorovský, Zdeněk - Dos Santos, S.
Ultrasonic Time Reversal Technique Used to In-Vivo Investigation of Humen Skin Under Loading.
ICU 2013. Singapore, 2013. s. 12-12.
[International Congress on ULTRASONICS. 02.05.2013-05.05.2013, Singapore]
Institutional support: RVO:61388998
Keywords : Time-reversal method * in-vivo methods * ultrasonic testing * viscoelasticity
Subject RIV: FO - Dermatovenerology

This contribution deals with ultrasonic noninvasive investigation of viscoelastic properties of the human skin under stepwise tensile loading in-vivo. A small skin-loading device with built-in ultrasonic transmitting and receiving probes is used to observe elastic wave propagation changes during the complex short time step loading and relaxation history. Chirp coded ultrasonic signals of variable amplitude in the frequency range 0.1 - 1 MHz are transmitted along the forearm. Linear ultrasonic parameters, velocity and attenuation, are evaluated from direct propagating waves, and Time Reversal (TR) procedure is used to reveal amplitude dependent spectral changes and nonlinear effects during the wave propagation at different loading and relaxation stages. TR signal reconstruction helps to partial elimination of dispersion effects. Instantaneous complex elastic modules are obtained from ultrasonic measurements.
Permanent Link: http://hdl.handle.net/11104/0229519