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Abstracl-An ultrasonic tapered phased array transducer, consisting of a linear phased array employing elements with a tapered thickness, was developed to study the feasibility of its use for hyperthermic treatment of deep-seated tumors. The cylindrical focal region is generated and steered in two dimensions by controlling the phases of the driving signals on each element and moved in the third dimension by changing the driving frequency. Experimentally obtained field intensity distributions are in good agreement with theoretical predictions. Acoustical power output measurements indicate that tapered phased arrays are capable of providing the intensities necessary for producing therapeutic temperatures in tumors.
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Benkeser et al. (1987) studied this question.
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