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The effect of fibers on the rate of heat deposition in the focal region of high-intensity focused ultrasound (HIFU) beams was investigated. Nylon, stainless steel and copper fibers of diameters 0.23–0.25, 0.33 and 0.51–0.53 mm embedded in a phantom were exposed to HIFU. The total energy deposited was quantified by measuring the volumes of the lesions formed. The average volumes of the lesions normalized...