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Our laboratories are investigating ultrasonic beams with asymmetric shapes to expedite the production of therrnal-Iesion matrices in tumors. The beams are generated using rectangular strip electrodes plated on spherical-cap ceramic transducers; focal-plane beam patterns consist of lobes confined within elliptical-rather than circular-cross-sections, Theoretical modeliing and ;n-vitro experiments have shown that thermal diffusion between these lobes can produce lesions with the desiredfatcat:6jkuimjp2vahhoqtozkqimcb6i