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Proceedings Paper

A scanned focused ultrasound device for hyperthermia: numerical simulation and prototype implementation
Author(s): Paul M. Meaney; Timothy Raynolds; Shireen D. Geimer; Lincoln Potwin; Keith D. Paulsen
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Paper Abstract

We are developing a scanned focused ultrasound system for hyperthermia treatment of breast cancer. Focused ultrasound has significant potential as a therapy delivery device because it can focus sufficient heating energy below the skin surface with minimal damage to intervening tissue. However, as a practical therapy system, the focal zone is generally quite small and requires either electronic (in the case of a phased array system) or mechanical steering (for a fixed bowl transducer) to cover a therapeutically useful area. We have devised a simple automated steering system consisting of a focused bowl transducer supported by three vertically movable rods which are connected to computer controlled linear actuators. This scheme is particularly attractive for breast cancer hyperthermia where the support rods can be fed through the base of a liquid coupling tank to treat tumors within the breast while coupled to our noninvasive microwave thermal imaging system. A MATLAB routine has been developed for controlling the rod motion such that the beam focal point scans a horizontal spiral and the subsequent heating zone is cylindrical. In coordination with this effort, a 3D finite element thermal model has been developed to evaluate the temperature distributions from the scanned focused heating. In this way, scanning protocols can be optimized to deliver the most uniform temperature rise to the desired location.

Paper Details

Date Published: 13 July 2004
PDF: 9 pages
Proc. SPIE 5312, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XIV, (13 July 2004); doi: 10.1117/12.552755
Show Author Affiliations
Paul M. Meaney, Dartmouth College (United States)
Microwave Imaging System Technologies, Inc. (United States)
Timothy Raynolds, Dartmouth College (United States)
Shireen D. Geimer, Dartmouth College (United States)
Lincoln Potwin, Dartmouth College (United States)
Keith D. Paulsen, Dartmouth College (United States)

Published in SPIE Proceedings Vol. 5312:
Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XIV
Brian Jet-Fei Wong M.D.; Nikiforos Kollias; Kenton W. Gregory M.D.; Henry Hirschberg; Reza S. Malek M.D.; Abraham Katzir; David S. Robinson M.D.; Kenneth Eugene Bartels D.V.M.; Eugene A. Trowers M.D.; Werner T.W. de Riese; Lawrence S. Bass M.D.; Lloyd P. Tate V.D.M.; Steen J. Madsen; Keith D. Paulsen; Karen M. McNally-Heintzelman, Editor(s)

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