|University of Illinois at Urbana-Champaign | Department of Electrical and Computer Engineering | Department of Bioengineering
Department of Statistics | Coordinated Science Laboratory | Beckman Institute | Food Science and Human Nutrition | Division of Nutritional Sciences | College of Engineering
|Wednesday, December 7th, 2022|
Image Formation for an In-Vivo Ultrasonic Microprobe
By Mark A. Haun.
The ultrasonic microprobe project is working to develop tiny ultrasound transducers that can be fabricated on a needle and operated in-vivo at high frequencies, with the eventual goal of resolving individual cells. A variety of synthetic aperture and tomographic imaging techniques are being explored to reconstruct the three-dimensional tissue volume surrounding such a probe. Related work will investigate methods for the compensation of phase errors caused by tissue inhomogeneities, as required for coherent imaging. Other challenges caused by the nonlinear propagation of sound may also need to be addressed.
One imaging concept uses a single focused transducer on the surface of a needle and builds on earlier work with synthetic aperture image formation with virtual sources. Given a set of pulse echoes recorded at various needle rotation angles and vertical positions, good resolution is achieved on the cylindrical surface defined by the transducer focal length and needle motion. Fourier-based synthetic aperture techniques can then be used to reconstruct the tissue reflectivity on more distant cylindrical shells with comparable resolution and reasonable computational effort.
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|Bioacoustics Research Lab.|