PROBLEM TO BE SOLVED: To provide a high-resolution distribution of intracerebral electric currents in a short time.SOLUTION: An apparatus for calculating intracerebral electric current comprises: initial grid setting means 110 for setting an initial grid electric current calculation means 120 which determines a lead field matrix [L] by solving a forward problem, determines an electric current source vector [s] by solving an inverse problem, and calculates an electric current at each lattice point on the basis of electromagnetic information subgrid setting means 140 which sets, only in an area of a previously set grid, lattice points to constitute a subgrid of a smaller pitch than that of the previously set grid on the basis of the electric current at each lattice point calculated by the electric current calculation means 120 and calculation execution means 150 which repeats one or more times the setting of a subgrid and the calculation of an electric current source vector [si+1] by the subgrid setting means 140 and the electric current calculation means 120 after the calculation of an electric current source vector [s1] corresponding to the initial grid is executed by the initial grid setting means 110 and the electric current calculation means 120.COPYRIGHT: (C)2014,JPO&INPIT【課題】解像度が高いとともに、短い時間で脳内電流分布を得る。【解決手段】初期グリッドを設定する初期グリッド設定手段110と、順問題を解くことによりリードフィールド行列[L]を求め、逆問題を解くことで電流源ベクトル[s]を求め、各格子点における電流を電磁的情報に基づき算出する電流算出手段120と、電流算出手段120で算出した各格子点における電流値に基づき、前回設定されたグリッドの一部の領域のみにおいて当該グリッドのピッチより小さなピッチでサブグリッドを構成する格子点を設定するサブグリッド設定手段140と、初期グリッド設定手段110と電流算出手段120により初期のグリッドに対応した電流源ベクトル[s1]の計算を実行した後、サブグリッド設定手段140と電流算出手段120によるサブグリッドの設定と電流源ベクトル[si+1]の計算を1回以上繰り返す計算実行手段150と、を備える。【選択図】図1
