An ultrasonic applicator, which utilizes both electronic and variable geometric focusing, for deep-localized hyperthermia is investigated. The applicator is based around a linear phased array that furnishes its electronic focusing capability. The output of the array radiates through a spherical liquid-lens that provides the applicator a variable geometric focusing capability as well. A lens of this type adds dynamic focusing to the elevation dimension of the linear phased array. By controlling the volume of liquid in the lens (and thus the radius of curvature of its membrane), dynamic control of the geometrical focus can be achieved. Comparisons of computer simulations and experimental measurements of the field intensity distribution of a small-scale prototype applicator are presented. Important design parameters, such as the choice of the liquid for the lens and the size and number of array elements, are examined. The range of applications for this device as well as its potential advantages over current applicator designs will also be discussed.
|Number of pages||6|
|Journal||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control|
|Publication status||Published - 1992 Mar|
Bibliographical noteFunding Information:
Manuscript received May 13, 1991; revised September 9, 1991; accepted September 10, 1991. This work was funded in part by grant RR04311 from the National Institutes of Health. The authors are with the Georgia Institute of Technology, School Electrical Engineering, Atlanta, GA 30332-0250 IEEE Log Number 9105550.
All Science Journal Classification (ASJC) codes
- Acoustics and Ultrasonics
- Electrical and Electronic Engineering