A novel ultrasonic elasticity imaging technique is being developed
to study structural properties of hydropolymers including biological
tissues. Radiation force is applied to harmonically stress the
medium while ultrasonic Doppler and optical methods track
deformation. This paper delineates basic system design and describes
methods for pressure-field calibration using an acoustic radiometer,
this extends to applying a radiation force to the media to remotely
exert a locally oscillating stress field at the desired frequency
within or on the medium surface. We use a single-element,
spherically-focused, circular piston element driven by a pulsing
voltage to produce a vibrating stress. Spectral Doppler techniques
were successfully adapted to image the locally induced vibration.
Our system delivers acoustic energy locally with an intensity
matched to the acoustic attenuation and stiffness of the common
biopolymers matrigel and chitosan.
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