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RF testbed for thermoacoustic tomography. Rev Sci Instrum 2009 Jun;80(6):064301 PMID: 19566215

Pubmed ID

19566215

DOI

10.1063/1.3133802

Abstract

Thermoacoustic signal excitation is a function of intrinsic tissue properties and illuminating electric field. De-ionized (DI) water is a preferred acoustic coupling medium for thermoacoustics because acoustic and electromagnetic waves propagate in DI water with very little loss. We have designed a water-filled testbed propagating a controlled electric field with respect to pulse shape, power, and polarization. Directional coupler line sections permit measurement of incident, reflected, and transmitted powers. Both S-parameters and E(y) measurement show that the electric-field distribution is relatively uniform in testbed. Comparing baseline power measurements to those taken with a test object in place yields power loss in the object, which should correlate to thermoacoustic signal strength. Moreover, power loss--and therefore thermoacoustic computerized tomography signal strength--is sensitive to the orientation of the object to the polarization of the electric field. This testbed will enable quantitative characterization of the thermoacoustic contrast mechanism in ex vivo tissue specimens.

Author List

Fallon D, Yan L, Hanson GW, Patch SK

Author

Sarah K. Patch PhD Associate Professor in the Physics department at University of Wisconsin - Milwaukee




Scopus

2-s2.0-67650281254   20 Citations

MESH terms used to index this publication - Major topics in bold

Acoustics
Algorithms
Aluminum
Electromagnetic Phenomena
Equipment Design
Models, Theoretical
Radio Waves
Temperature
Tomography
Ultrasonography
Water
jenkins-FCD Prod-310 bff9d975ec7f2d302586822146c2801dd4449aad