Control of lesion geometry using asymmetric beams for ultrasonic tumor therapy

Frederick L. Lizzi; Michael Astor; Cheri X. Deng; Angel Rosado; Ronald H. Silverman; Mark Rondeau; D. Jackson Coleman M.D.

doi:10.1117/12.308014

1 May 1998 Control of lesion geometry using asymmetric beams for ultrasonic tumor therapy

Frederick L. Lizzi, Michael Astor, Cheri X. Deng, Angel Rosado, Ronald H. Silverman, Mark Rondeau, D. Jackson Coleman M.D.

Author Affiliations +

Proceedings Volume 3341, Medical Imaging 1998: Ultrasonic Transducer Engineering; (1998) https://doi.org/10.1117/12.308014
Event: Medical Imaging '98, 1998, San Diego, CA, United States

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

Citation Download Citation

Frederick L. Lizzi, Michael Astor, Cheri X. Deng, Angel Rosado, Ronald H. Silverman, Mark Rondeau, and D. Jackson Coleman M.D. "Control of lesion geometry using asymmetric beams for ultrasonic tumor therapy", Proc. SPIE 3341, Medical Imaging 1998: Ultrasonic Transducer Engineering, (1 May 1998); https://doi.org/10.1117/12.308014

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