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Development of inductive regional heating system for breast hyperthermia

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5 Author(s)
Kotsuka, Y. ; Fac. of Eng., Tokai Univ., Kanagawa, Japan ; Watanabe, M. ; Hosoi, M. ; Isono, I.
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In response to demand for clinical use, a simple noninvasive regional heating applicator system for breast hyperthermia has been developed using ferrite cores. Since the breast is positioned between a pair of ferrite cores, it is possible to regionally heat it without considering the dimension of the breast. To find a method of controlling the heating position horizontally and vertically, magnetic-held distributions are analyzed using the three-dimensional finite-element method. Theoretical analyses suggest that a conductive thin plate and a novel eddy current absorber are effective for controlling the maximum heating position. A new applicator system operates at a frequency of 4 MHz and a maximum output power of 600 W. Heating tests using an agar phantom and rabbits show a temperature rise of more than 8°C at a depth of 8 cm after heating for 10 min without heating fatty tissue.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:48 ,  Issue: 11 )