Title :
The design of ultrasound applicators for interstitial hyperthermia
Author :
Diederich, C.J. ; Stauffer, Paul R. ; Phillips, T.L.
Author_Institution :
Dept. of Radiat. Oncology, California Univ., San Francisco, CA
fDate :
31 Oct-3 Nov 1993
Abstract :
Theoretical and experimental methods were used to evaluate two new design strategies of interstitial ultrasound applicators for hyperthermia. The basic schema consists of a multielement array of tubular piezoceramic radiators, each with separate RF power control. Computer simulation programs were developed to calculate the acoustic fields and resultant thermal distributions of these applicators when embedded in tissue. A quantitative analysis was undertaken to determine heating performance as a function of implant spacing, blood perfusion, catheter material, temperature of circulating coupling medium, frequency, and acoustic power output. Prototype multielement applicators were constructed and characterized in terms of acoustic pressure distributions and acoustic power output capabilities
Keywords :
biomedical equipment; biomedical ultrasonics; biothermics; radiation therapy; thermoacoustics; ultrasonic effects; ultrasonic transducers; RF power control; acoustic fields; blood perfusion; catheter material; circulating coupling medium; interstitial hyperthermia; interstitial ultrasound applicators; multielement array; thermal distributions; tubular piezoceramic radiators; Applicators; Computer simulation; Heating; Hyperthermia; Implants; Performance analysis; Piezoelectric materials; Power control; Radio frequency; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 1993. Proceedings., IEEE 1993
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1993.339614
