Our goal has been to develop thin‐profile HIFU applicators for intraoperative hemostasis. The HIFU device consisted of a concave PZT element encased in a spoon‐shaped aluminum housing with the diameter of 4 cm and thickness of 1 cm. The housing front surface had a thickness of ultrasound wavelength in aluminum (0.92 mm) to provide acoustic matching. The device had a resonant frequency of 6.26 MHZ, and efficiency of 42%. The ultrasound field was observed using hydrophone field mapping and radiation force balance. The full‐width half‐maximum (FWHM) dimensions of the focal region were 0.6 mm and 2.2 mm in lateral and axial direction, respectively. The maximal intensity at the focus was 9,500 W/cm2 (in water). The device was tested using BSA‐polyacrylamide gel phantom and rabbit kidney in vivo. HIFU application for 10 s produced lesions in the gel phantom (lesion width of 3 mm), and rabbit kidney in vivo (lesion width of 8 mm). A thin‐profile HIFU applicator has advantages of high efficiency, simple design, and small dimensions.
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28 March 2005
4TH INTERNATIONAL SYMPOSIUM ON THERAPEUTIC ULTRASOUND
18-20 September 2004
Kyoto (Japan)
Research Article|
March 28 2005
Thin‐Profile Transducers for Intraoperative Hemostasis
Vesna Zderic;
Vesna Zderic
*Applied Physics Laboratory, University of Washington, Seattle, WA
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Thomas Mera;
Thomas Mera
†Department of Bioengineering, University of Washington
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Shahram Vaezy
Shahram Vaezy
*Applied Physics Laboratory, University of Washington, Seattle, WA
†Department of Bioengineering, University of Washington
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Vesna Zderic
st
Thomas Mera
gger
Shahram Vaezy
st,gger
*Applied Physics Laboratory, University of Washington, Seattle, WA
†Department of Bioengineering, University of Washington
AIP Conf. Proc. 754, 256–258 (2005)
Citation
Vesna Zderic, Thomas Mera, Shahram Vaezy; Thin‐Profile Transducers for Intraoperative Hemostasis. AIP Conf. Proc. 28 March 2005; 754 (1): 256–258. https://doi.org/10.1063/1.1901650
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