PROBLEM TO BE SOLVED: To provide a magnetic field source estimation system by which magnetic field sources are estimated with high resolution without designating the number of magnetic field sources.SOLUTION: The magnetic field source estimation system includes: an acquisition unit 201 for acquiring an observation magnetic field being the magnetic field of a brain observed at a prescribed observation position a disposing unit 202 for disposing N (natural number) current dipoles respectively corresponding to N current magnetic field sources into brain model data an arithmetic magnetic field calculation unit 203 for calculating arithmetic magnetic fields of the observed magnetic fields at positions same as observation positions of brain model data where the N current dipoles are disposed by the disposing unit 202 an evaluation value calculation unit 204 for calculating an evaluation value for evaluating the difference between the observation magnetic fields and the arithmetic magnetic fields and a magnetic field number increasing unit 205 for increasing a variation number before and after the increase of N that is the evaluation value calculated by the evaluation value calculation unit 204 until it becomes under a first threshold value and specifying N magnetic field sources respectively corresponding to N current dipoles disposed in the brain model data at a time point when the variation value becomes under the first threshold value.COPYRIGHT: (C)2011,JPO&INPIT【課題】磁場源数を予め指定することなく、高い時間分解能で磁場源を推定する。【解決手段】所定の観測位置において観測された脳の磁場である観測磁場を取得する取得部201と、N個(Nは自然数)の磁場源にそれぞれ対応するN個の電流双極子を、脳モデルデータに配置する配置部202と、配置部202によりN個の電流双極子が配置された脳モデルデータの観測位置と同位置において、観測される磁場である計算磁場を算出する計算磁場算出部203と、観測磁場と、計算磁場との差を評価する評価値を算出する評価値算出部204と、評価値算出部204で算出される評価値の、Nの増加前後の変化値が第1の閾値未満となるまでNを増加させ、変化値が第1の閾値未満となった時点において脳モデルデータに配置されたN個の電流双極子にそれぞれ対応するN個の磁場源を特定する磁場源数増加部205とを備える。【選択図】図2
