Anisotropic microstructured poly(vinyl alcohol) tissue-mimicking phantoms Letters

Novel microstructured PVA phantoms mimicking fibrous tissues have been developed using a simple freezecasting process. Scanning electron micrographs reveal highly anisotropic microstructure with dimensions of the order of 5 to 100 mu m. Characterization of an example phantom revealed acoustic proper...

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Bibliographic Details
Published inIEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 57; no. 7; pp. 1494 - 1496
Main Authors Dawson, Andrew, Harris, Paul, Gouws, Gideon
Format Journal Article
LanguageEnglish
Published 01.07.2010
Subjects
Anisotropy
Attenuation coefficients
Electron micrographs
Ferroelectric materials
Human
Microstructure
Orientation
Scanning
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Summary:Novel microstructured PVA phantoms mimicking fibrous tissues have been developed using a simple freezecasting process. Scanning electron micrographs reveal highly anisotropic microstructure with dimensions of the order of 5 to 100 mu m. Characterization of an example phantom revealed acoustic properties consistent with those found in fibrous tissues. At 20 MHz, the velocity measured parallel to the microstructure orientation of 1555 ms super([iquest]1) was significantly greater than that perpendicular to the microstructure of 1537 ms super([iquest]1). The attenuation coefficient was measured to be 5 dB[iquest]mm super([iquest]1) and proportional to the 1.6 power of frequency, which is in good agreement with that for normal human myocardium.
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ISSN:0885-3010
DOI:10.1109/TUFFC.2010.1579