A new method for computing array element amplitude and phase distributions for direct synthesis of multiple-focus field patterns using ultrasonic phased arrays is shown to be capable of producing desired field levels at a set of control points in the treatment volume. The complex pressure at any of these control points can be chosen to produce the desired power deposition at that point, including reducing the field level to avoid potential hot spots, thus providing a powerful tool for hyperthermia treatment planning. The method also allows the complex excitation vector to be weighted to reduce the dynamic range of the driving signals without disturbing the relative field levels at the control points allowing near maximum power transfer from the array into the treatment volume.
|Original language||English (US)|
|Number of pages||9|
|Journal||IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control|
|State||Published - Sep 1989|
Bibliographical noteFunding Information:
Manuscript receivcd December h. 1988: revlsed March IO. 1989; accepted March 10. 1989. Thi\ work was wpported in part by grant CA34124 from thc National Instttute of Health. an Award trotn Hitachi Central Re- ccarch Laboratory. Hitachi Ltd.. Tohyo, Japan. and grant ECS870001 from the National Ccntcr lor Supercomputing Applications (NCSA) at the Uni- versity ot Ill1nols. The authors are i ~ ~ ttheh Bloacou\tics Research Laboratory. Department of Electrical and Computer Enylnecring. Unl\er$ity of Illinois at Urhana-Chatnpalgn. 1306 W Grcen Street. Crhana. IL 61801. IEEE Lop Number 8929 145.
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