PROBLEM TO BE SOLVED: To accurately detect an in-vivo signal source position using a small number of electrodes.SOLUTION: First and second voltages Vi and V'i generated in each electrode when first and second external resistors Rg1 and Rg2 are connected in parallel respectively between four electrodes arranged on a living body surface and a ground electrode are measured. A three-dimensional position (x, y, z) of a signal source is detected by solving a system of equations.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2019,JPO&INPIT【課題】少ない数の電極を用いて、生体内にある信号源の位置を、精度よく検出する。【解決手段】生体表面に配置した４つの各電極とグランド電極との間に、第１及び第２の外部抵抗Ｒｇ１、Ｒｇ２をそれぞれ並列接続したときに各電極に生じる第１及び第２の電圧Ｖｉ、Ｖ’ｉを測定し、信号源の３次元位置（ｘ、ｙ、ｚ）を連立方程式)を解くことによって検出する。【選択図】図６
