公开(公告)号：US5243984A

公开(公告)日：1993-09-14

申请号：US928782

申请日：1992-08-13

申请人： Yukiko Ogura ,  Kensuke Sekihara ,  Hisaaki Ochi

发明人： Yukiko Ogura ,  Kensuke Sekihara ,  Hisaaki Ochi

IPC分类号： A61B5/04 ,  A61B5/0402 ,  A61B5/0476 ,  A61B5/0488 ,  G01N27/00 ,  G01N27/72 ,  G06F17/00 ,  G06K9/00

CPC分类号： G06K9/0057 ,  A61B5/04005 ,  A61B5/0476

摘要： A living body is replaced by a 3-D network. Admittance connected to lines forming the 3-D network is calculated. Position rt and magnitude qt=(jtx,jty,jtz) of a current dipole are assumed, and current sources jtx, jty and jtz are connected in parallel with lines coupled to a node. Node equations are formulated, and an admittance matrix Y is derived. An inverse matrix Y' of Y is calculated, and body surface potential generated by the current sources is calculated by using the inverse matrix Y'. Then, rt and qt minimizing cost function which is sum total of squares of differences between measured values of body surface potential and the above described calculated values for all measuring points are derived. Thereby potential distribution on the body surface can be calculated with due regard to the shape of the living body and conductivity distribution in the living body on the basis of the assumed current dipole. On the basis of measured data of potential distribution on the body surface, therefore, the position and magnitude of the current dipole can be estimated with high precision.