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Title: Development of a High Intensity Focused Ultrasound (HIFU) Hydrophone System

Abstract

The growing clinical use of High Intensity Focused Ultrasound (HIFU) has driven a need for reliable, reproducible measurements of HIFU acoustic fields. We have previously presented data on a reflective scatterer approach, incorporating several novel features for improved bandwidth, reliability, and reproducibility [Proc. 2005 IEEE Ultrasonics Symposium, 1739-1742]. We now report on several design improvements which have increase the signal to noise ratio of the system, and potentially reduced the cost of implementation. For the scattering element, we now use an artificial sapphire material to provide a more uniform radiating surface. The receiver is a segmented, truncated spherical structure with a 10 cm radius; the scattering element is positioned at the center of the sphere. The receiver is made from 25 micron thick, biaxially stretched PVDF, with a Pt-Au electrode on the front surface. In the new design, a specialized backing material provides the stiffness required to maintain structural stability, while at the same time providing both electrical shielding and ultrasonic absorption. Compared with the previous version, the new receiver design has improved the noise performance by 8-12 dB; the new scattering sphere has reduced the scattering loss by another 14 dB, producing an effective sensitivity of -298 dB remore » 1 microVolt/Pa. The design trade-off still involves receiver sensitivity with effective spot size, and signal distortion from the scatter structure. However, the reduced cost and improved repeatability of the new scatter approach makes the overall design more robust for routine waveform measurements of HIFU systems.« less

Authors:
 [1];  [2]
  1. Sonic Tech, Inc., Ambler, PA 19002 (United States)
  2. Sonora Medical Systems, Longmont, CO 80503 (United States)
Publication Date:
OSTI Identifier:
21293557
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1113; Journal Issue: 1; Conference: 8. international symposium on therapeutic ultrasound, Minneapolis, MN (United States), 10-13 Sep 2008; Other Information: DOI: 10.1063/1.3131435; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ABSORPTION; CAVITATION; DESIGN; ELECTRICAL INSULATION; ELECTRODES; FOCUSING; ORGANIC FLUORINE COMPOUNDS; PERFORMANCE; POLYVINYLS; RELIABILITY; SAPPHIRE; SENSITIVITY; SIGNAL DISTORTION; SIGNAL-TO-NOISE RATIO; SURFACES; ULTRASONIC WAVES; WAVE FORMS

Citation Formats

Schafer, Mark E, and Gessert, James. Development of a High Intensity Focused Ultrasound (HIFU) Hydrophone System. United States: N. p., 2009. Web. doi:10.1063/1.3131435.
Schafer, Mark E, & Gessert, James. Development of a High Intensity Focused Ultrasound (HIFU) Hydrophone System. United States. https://doi.org/10.1063/1.3131435
Schafer, Mark E, and Gessert, James. 2009. "Development of a High Intensity Focused Ultrasound (HIFU) Hydrophone System". United States. https://doi.org/10.1063/1.3131435.
@article{osti_21293557,
title = {Development of a High Intensity Focused Ultrasound (HIFU) Hydrophone System},
author = {Schafer, Mark E and Gessert, James},
abstractNote = {The growing clinical use of High Intensity Focused Ultrasound (HIFU) has driven a need for reliable, reproducible measurements of HIFU acoustic fields. We have previously presented data on a reflective scatterer approach, incorporating several novel features for improved bandwidth, reliability, and reproducibility [Proc. 2005 IEEE Ultrasonics Symposium, 1739-1742]. We now report on several design improvements which have increase the signal to noise ratio of the system, and potentially reduced the cost of implementation. For the scattering element, we now use an artificial sapphire material to provide a more uniform radiating surface. The receiver is a segmented, truncated spherical structure with a 10 cm radius; the scattering element is positioned at the center of the sphere. The receiver is made from 25 micron thick, biaxially stretched PVDF, with a Pt-Au electrode on the front surface. In the new design, a specialized backing material provides the stiffness required to maintain structural stability, while at the same time providing both electrical shielding and ultrasonic absorption. Compared with the previous version, the new receiver design has improved the noise performance by 8-12 dB; the new scattering sphere has reduced the scattering loss by another 14 dB, producing an effective sensitivity of -298 dB re 1 microVolt/Pa. The design trade-off still involves receiver sensitivity with effective spot size, and signal distortion from the scatter structure. However, the reduced cost and improved repeatability of the new scatter approach makes the overall design more robust for routine waveform measurements of HIFU systems.},
doi = {10.1063/1.3131435},
url = {https://www.osti.gov/biblio/21293557}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1113,
place = {United States},
year = {Tue Apr 14 00:00:00 EDT 2009},
month = {Tue Apr 14 00:00:00 EDT 2009}
}