Department of Physics Colloquium

Guest speaker: Dr. Yuu Ono Department of Systems and Computer Engineering, Carleton University
Thursday, 16 May 2019 - 2:45 pm to 3:45 pm
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Title: Ultrasonic palpation for characterizing viscoelasticity of biological soft tissues

Abstract: Ultrasound imaging is widely and regularly used for medical diagnosis in hospitals and clinics since it is non-invasive, risk-free (non-ionizing radiation), real-time, portable and low-cost. This talk presents an ultrasonic method for characterising viscoelastic properties of a biological soft tissue by measuring its shear wave (SW) propagation characteristics (velocity and attenuation). A continuous SW was induced into a specimen by an external vibration source. The displacements within the specimen due to the SW propagation were measured by a speckle-echo tracking method using a conventional B-mode scan of focused ultrasound. Then, SW velocity and absorption coefficient of the specimen were retrieved from the measured SW waveforms. A SW measurement method and error factors, such as motion artifacts, SW reflection and diffraction, were investigated by numerical simulations and tissue mimicking phantom experiments. Finally, in-vivo experiments at the ankle of human subjects were conducted. The contrast of the SW velocity image obtained successfully distinguished the Achilles tendon from the surrounding tissues.