Estimation of Electrical Source Localization Using the Temporal Correlation between Magnetic Field Measurements |
| |
Authors: | Takashi Obi Nagaaki Ohyama Masahiro Yamaguchi Kensuke Sekihara |
| |
Affiliation: | (1) Imaging Science and Engineering Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku Yokohama 227, Japan;(2) Central Research Laboratory, Hitachi, Ltd., 1-280 Higashi-Koigakubo, Kokubunji, Tokyo 185, Japan |
| |
Abstract: | It is well known that an inverse problem of biomagnetic imaging is generally ill-posed. Recently several attempts using biocoherence have been 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-posedness cannot be improved. In this paper, we propose an approach to estimate the location of current sources under the condition that sources of different positions have little or weak correlation. Our method is based on a well-known regularization method, the truncated SVD method. Compared with the conventional method, our technique allows accurate determination of the location of current sources because it improves the ill-posedness of the inverse problem. We carried out computer simulations using the half-space conducting model and confirmed the effectiveness of our method. |
| |
Keywords: | biomagnetism biological current temporal correlation source localization truncated SVD |
本文献已被 SpringerLink 等数据库收录! |
|