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Sound medicine at Acoustics Meeting
Date:11/13/2007

rous tumors form on the liver or another one of the bodys organs, they are often stiffer than the surrounding tissues because there are more blood vessels to support the tumors. The problem is, how can you measure stiffness in tissues deep within the body" There is no such thing as a liver self-exam.

Matthew Urban (Urban.Matthew@mayo.edu) and his colleagues at the Mayo Clinic College of Medicine are designing ways to measure the stiffness of tissues as a non-invasive diagnostic tool. Urban will present his latest experiments in which he and his colleagues used focused ultrasound waves to deliver tiny vibrations to a steel sphere encased in gelatina model of a tissue with a stiff lesion. They were able to measure the frequency response of the sphere to acoustical waves of multiple frequencies, which can be used to determine the stiffness of the tissue-mimicking material. The method also provides new ways to non-invasively cause vibration for assessment of tissue stiffness without the presence of the steel sphere.

Moreover, they were able to deliver the energy to the sphere without heating the surrounding gelatin. This is one of the challenges of using highly focused ultrasound, because acoustical energy can be absorbed by nearby tissues in the form of heat.

The talk, Modulated ultrasound and multifrequency radiation force (3pBB1) will be at 1:15 p.m. on Thursday, Nov. 29.

7) ACOUSTIC MINISCALPELS FOR NON-INVASIVE SURGERY

The idea of making surgical incisions inside the body without ever opening or puncturing the skin in any way might sound like something out of a science fiction novel, but the technology may be just around the corner. High-intensity ultrasound may someday allow acoustical waves to be focused into the worlds tiniest scalpels.

Zhen Xu (zhenx@eecs.umich.edu) and colleagues at the University of Michigan are using
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Contact: Jason Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

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