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

Volume

2

fYear

2000

fDate

36800

Firstpage

1235

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2000 IEEE

Conference_Location

San Juan

ISSN

1051-0117

Print_ISBN

0-7803-6365-5

Type

conf

DOI

10.1109/ULTSYM.2000.921546

Filename

921546