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Ultrasound-Mediated Imaging

Researcher: Yuan Xu

The Laboratory for Ultrasound-mediated imaging was established in July 2005 with the Ryerson startup fund. The research goal of the lab is to develop high-spatial-resolution imaging modalities to map the electrical properties of biological tissues. In the past few years, we have been focusing on various methods to combine ultrasound and electromagnetic field to extract electrical and mechanical properties of tissues. The methods we have worked on include thermoacoustic tomography (photoacoustic tomography), magneto-acoustic tomography with magnetic induction, magneto-acousto-electrical tomography, acousto-electrical tomography, and the effect of electrical current on ultrasound echoes. By utilizing both electromagnetic fields and acoustic waves we hope to combine the good contrast of the pure electromagnetic approaches with the good spatial resolution of pure ultrasound approaches. The research is aimed to develop new imaging modalities for early detection of diseases and monitoring therapy.

Equipment

Digitizers
14-bit, 10MHz Gage card
16-bit, 200 MHz Gage card
Preamplifiers
NF low-noise differential amplifier SA-430F5, up to 70 MHz
NF low-noise differential amplifier SA-420F5, up to 110 MHz
Stanford low-noise voltage amplifier
Stanford low-noise current amplifier
Variable 400 volt square wave pulser/receiver with 35 MHz bandwidth
A two-dimensional raster scanner
A permanent magnet that can generate a magnetic field of 0.1- 0.2 T within a volume of 4 inch cube
Different digital and analog function generators

Research Area: 
Medical Imaging and Treatment Modalities