Title :
Wideband transducers for improved control of interstitial heating patterns
Author :
Chopra, Rajiv ; Luginbuhl, Chris ; Foster, F. Stuart ; Bronskill, Michael J.
Author_Institution :
Dept. of Med. Biophys., Toronto Univ., Ont., Canada
Abstract :
The feasibility of using multilayered transducers for variable frequency interstitial ultrasound thermal therapy was investigated. KLM calculations and experimental measurements evaluated the ability to transmit high intensity ultrasound at multiple frequencies from a single transducer. Heating simulations demonstrated the improved control over lesion depth with this design. Using a quarter wavelength PZT front “mismatching” layer, two transmission bands at 3.5 and 7.5 MHz were possible, resulting in the ability to control the lesion depth by a factor of 1.5 in tissue
Keywords :
biomedical transducers; biomedical ultrasonics; hyperthermia; ultrasonic transducers; 3.5 MHz; 7.5 MHz; KLM calculations; PZT; PbZrO3TiO3; heating simulations; high intensity ultrasound; interstitial heating patterns control; interstitial ultrasound thermal therapy; lesion depth; multilayered transducers; quarter wavelength front mismatching layer; variable frequency; wideband transducers; Frequency measurement; Heating; Lesions; Medical treatment; Temperature control; Thermal variables control; Thermal variables measurement; Ultrasonic imaging; Ultrasonic transducers; Wideband;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.921546
