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Proceedings Paper

Control of lesion geometry using asymmetric beams for ultrasonic tumor therapy
Author(s): Frederick L. Lizzi; Michael Astor; Cheri X. Deng; Angel Rosado; Ronald H. Silverman; Mark Rondeau; D. Jackson Coleman M.D.
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Paper Abstract

This report describes ultrasonic transducers that are designed to expedite thermal-necrosis treatment of tumors, particularly in the eye. The spherical-cap transducers employ pairs of parallel strip-electrodes to generate focal-zone beam patterns that are narrow in one direction and exhibit a number ofprominent lobes over a larger width in the orthogonal direction. Diffraction analysis and thermal modelling are employed to derive information for designing such asymmetric beams and producing continuous, asymmetric thermal lesions within tumors. Compared with typical ellipsoidal lesions, the "chicklet" shaped lesions produced by these beams permit a larger tissue volume to be treated as the transducer is scanned across a tumor. This fact can reduce the number ofscans required to treat entire tumors and may significantly reduce overall clinical treatment times. Keywords: ultrasonic therapy, ultrasonic transducers, thermal modelling, thermal necrosis, high-intensity focused ultrasound

Paper Details

Date Published: 1 May 1998
PDF: 8 pages
Proc. SPIE 3341, Medical Imaging 1998: Ultrasonic Transducer Engineering, (1 May 1998); doi: 10.1117/12.308014
Show Author Affiliations
Frederick L. Lizzi, Riverside Research Institute (United States)
Michael Astor, Riverside Research Institute (United States)
Cheri X. Deng, Riverside Research Institute (United States)
Angel Rosado, Riverside Research Institute (United States)
Ronald H. Silverman, Cornell Univ. Medical College (United States)
Mark Rondeau, Cornell Univ. Medical College (United States)
D. Jackson Coleman M.D., Cornell Univ. Medical College (United States)

Published in SPIE Proceedings Vol. 3341:
Medical Imaging 1998: Ultrasonic Transducer Engineering
K. Kirk Shung, Editor(s)

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