Reconstruction of extended current sources in a human body phantom applying biomagnetic measuring techniques

We have prepared a human body phantom for experimental verification of inve rse solution techniques which are applied to magnetic (and electric) measur ing data. Physical models of extended primary current sources were used to generate these fields. Magnetic field maps closed to the phantom surface we re recorded by means of multi-channel biomagnetic measuring systems, Differ ent deterministic optimization techniques were applied to both measured and simulated data to reconstruct the impressed current density distribution. We have found that all common used minimum norm methods (L-p-norms, 1 less than or equal to p less than or equal to 2) cannot reconstruct the extensio n of current source distributions satisfactorily. The physical phantom uas found to be a suitable tool for validation of source reconstruction techniq ues.