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A spherical-section ultrasound phased array applicator for deep localized hyperthermia

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2 Author(s)
Ebbini, E.S. ; Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA ; Cain, C.A.

Computer data are presented for a nonplanar phased-array proposed as an applicator for deep, localized hyperthermia. The array provides precise control over the heating pattern in three dimensions. The array elements form a rectangular lattice on a section of a sphere so that the array has a natural focus at its geometric center when all its elements are driven in phase. When compared to a planar array with similar dimensions, the spherical-section array provides higher focal intensity gain. The relative grating-lobe level (with respect to the focus) is lower for scanned foci synthesized with this array (compared to a planar array with equal center-to-center spacing and number of elements). The spherical-section array has been simulated for use as a spot-scanning applicator as well as an applicator producing directly synthesized heating patterns.

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Biomedical Engineering, IEEE Transactions on  (Volume:38 ,  Issue: 7 )