Abstract
Hyperthermia is a cancer therapy by using thermosensitivity of cancer cells. We previously developed a wireless temperature measurement system for Hyperthermia using Ferromagnetic Implant with Low Curie Temperature (FILCT). However, when initial bias, caused by the position and posture of the detection coil, is large enough, change of feeble voltage in the detection coil cannot detect. In this report, therefore, we suggest a method for reducing the initial bias by analog signal superimposition. A reverse phase voltage of an additional coil is added to the voltage of the original detection coil, as a result the initial bias value is by 0V. Furthermore, as the reverse phase voltage changes concurrently, the influence caused by the fluctuation in applied magnetic field can be also reduced. We verified our analog signal superimposition method and confirmed its validity by physical experiments.
