Among women living in the United States, breast :ancer is the most common malignancy diagnosed and the second leading cause of death from cancer []]. Better herapies are clearly needed for breast cancer, which notivates the development of new adjuvant hyperthermia reatmenls. External heating devices appropriate for deep lyperthermia in the intact breast include ultrasound phased irrays [2] and radio-frequency (RF) electromagnetic phased irrays [3]. Ultrasound (US) is an appropriate local modality x>r heating small targets in the breast (up to about 2cm jiameter [4]), whereas heat generated by RF electromagnetic devices is delivered regionally across a nuch larger area. Ultrasound phased arrays have been evaluated for ablation of fibroadenomas in the breast [2], md RF phased arrays have been developed previously for Jeep hyperthermia in the pelvis [3] and in the extremities 5], respectively.
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