Problem to be solved: to provide an in vivo signal intensity detecting method capable of detecting a signal strength of a signal source in vivo using a small number of electrodes.A method of disposing at least two electrodes on the circumference of the biological surface to locate the position information of the signal source in the plane including two electrodes, and each electric field in the plane including two electrodes to surround the plurality of signal sources in the body The method of calculating the distance r between the signal source and each electrode from the position information of the pole and the location information of the signal source, measuring the voltage V between each electrode and ground potential, or measuring the voltage V across each electrode, in the distance r, V, and in the body SignalBased on the attenuation equation of the source, the signal strength of the signal source in vivo is detected.Diagram【課題】少ない数の電極を用いて、生体内の信号源の信号強度を検出することができる生体内信号強度検出方法を提供する。【解決手段】生体内の複数の信号源を囲むように、生体表面の円周上に少なくとも2つの電極を配置する工程と、2つの電極を含む平面内における信号源の位置情報を求める工程と、2つの電極を含む平面内における各電極の位置情報、及び、信号源の位置情報から、信号源と各電極との距離rを算出する工程と、各電極とグランド電位との間、又は、各電極間に生じる電圧Vを測定する工程とを含み、距離r、電圧V、及び、体内における信号源の減衰式に基づいて、生体内の信号源の信号強度を検出する。【選択図】図2
