Title :
Asymmetric focussed arrays for ultrasonic tumor therapy
Author :
Lizzi, F.L. ; Astor, M. ; Deng, C. ; Rosado, A. ; Coleman, D.J. ; Silverman, R.
Author_Institution :
Riverside Res. Inst., New York, NY, USA
Abstract :
This study investigated transducer array configurations to produce thermal necrosis lesions for ultrasonic treatment of ocular tumors. Spherical-cap transducers with segmented strip electrodes were designed to produce asymmetric focal-plane beam patterns that may expedite the production of lesion matrices. Phased electrode excitation was evaluated as a means of reducing focal-point intensities to suppress undesired gas-body formation. Experimental beam patterns agreed well with theoretical results and initial in-vitro experiments demonstrated desired lesion features
Keywords :
biomedical equipment; biomedical ultrasonics; eye; radiation therapy; ultrasonic transducer arrays; asymmetric focal-plane beam patterns; asymmetric focussed arrays; desired lesion features; experimental beam patterns; eye cancer; focal-point intensities reduction; in-vitro experiments; lesion matrices production; medical instrumentation; ocular tumors; phased electrode excitation; segmented strip electrodes; thermal necrosis lesions; transducer array configurations; ultrasonic treatment; ultrasonic tumor therapy; undesired gas-body formation suppression; Biomedical electrodes; Biomedical transducers; Hyperthermia; Lesions; Medical treatment; Neoplasms; Temperature; Ultrasonic imaging; Ultrasonic transducer arrays; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.584230
