ESTIMATION OF ELECTRICAL SOURCE LOCALIZATION USING THE TEMPORAL CORRELATION BETWEEN MAGNETIC-FIELD MEASUREMENTS

It is well known that an inverse problem of biomagnetic imaging is gen erally ill-posed. Recently several attempts using biocoherence have be en reported, but the ill-condition is not considered in these previous methods. If the conventional reconstruction formula is under the ill- condition, the reconstruction problem is also ill-posed and the ill-po sedness cannot be improved. In this paper, we propose an approach to e stimate the location of current sources under the condition that sourc es of different positions have little or weak correlation. Our method is based on a well-known regularization method, the truncated SVD meth od. Compared with the conventional method, our technique allows accura te determination of the location of current sources because it improve s the ill-posedness of the inverse problem. We carried out computer si mulations using the half-space conducting model and confirmed the effe ctiveness of our method.