A prototype 64-element, 75° cylindrical-section ultrasonic phased-array hyperthermia applicator has been designed and constructed. The ability of this applicator to focus ultrasonic energy at its geometric focus was verified in a water medium. The array was then driven by excitation vectors obtained using the pseudoinverse pattern synthesis method to generate shifted-focus and multiple-focus field patterns. Experimental results of single and multiple-focus patterns at 500 kHz are given and are in good agreement with theory.
|Original language||English (US)|
|Number of pages||11|
|Journal||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control|
|State||Published - Sep 1991|
Bibliographical noteFunding Information:
Manuscript received December 28, 1990; revised and accepted March 11, 1991. This work supported in part by grant CA44124 from the National Institutes of Health, in part by an award from Hitachi Central Research Laboratory. Hitachi Ltd., Tokyo, Japan. and in part by grant ECS870001 from the National Center for Supercomputing Applications (NCSA) at the University of Illinois. Urbana. The authors are with The University of Michlgan, Bioengineering Pro- gram, 3304 G. G. Brown/Dow Connecter, Ann Arbor, MI 48109-2125. IEEE Log Number 9101 154.