Journal of Medical Physics
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Year : 1986  |  Volume : 11  |  Issue : 3  |  Page : 412

High Efficiency Ferrite Transformer Used With Broad Loop RF Hyperthermia Applicators



Correspondence Address:
M.J Birjandi


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Source of Support: None, Conflict of Interest: None


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Use has been made of the commercial broadcasting BBC transmitters to provide Radio-Frequency power into broad loop applicators for the use on the extremities and on the trunk at 27.12 MHZ. A matching network has been designed and fabricated to meet the requirements for the intermediate stage between the transmitters and the broad loop applicator with a diameter of 26.7 cm and 20 cm long The network employs an UN-BAL ferrite transformer as an intermediate impedance magnifier. Experiments have been carried out to determine the optimum combination for the transformer in order to determine the efficiency of power transfer through t o the broad loop results show 88.9 % and 64.2 % efficiency of the Input RF power to heat convertior by the broad loop, using 1.5 it and 1 lt. cylindrical liquid phantoms, with a NaCl concentration of 0.9% of similar quality factor as an average thing and arm respectively. Temperature rises of 8.5 and 9.2 degree C. have been recorded in the 1.5 lt. and 1 lt. phantoms exposed for 10 minutes to 100 watts of input RF power. The power input obtainable from the commercial broadcasting BBC predicted that each ferrite transformer can only handle about 500 watts of RF power.


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