Surgery – Diagnostic testing – Detecting nuclear – electromagnetic – or ultrasonic radiation
Patent
1998-01-20
2000-06-06
Jaworski, Francis J.
Surgery
Diagnostic testing
Detecting nuclear, electromagnetic, or ultrasonic radiation
600544, A61B 505
Patent
active
060730404
ABSTRACT:
An electrophysiological activity estimation method is used to estimate active areas of a selected part of a living body (e.g., human brain). Based on electromagnetic field distribution measured on a surface of the selected part of the living body as well as its shape, the method assumes each equivalent current dipole as a source of electromagnetic field distribution. At first, grid points are created to cover the selected part of the living body (e.g., head). Using the pseudoinverse, the method performs estimation of dipole distribution for equivalent current dipoles. Then, the equivalent current dipoles are subjected to sorting based on a priority order. An evaluation function (e.g., structural risk) is calculated in accordance with a square error between the measured electromagnetic field distribution and a theoretical value of electromagnetic field distribution caused by the equivalent current dipole, as well as a number of measuring points and a number of equivalent current dipoles. Estimation and calculations are repeated while changing a number of equivalent current dipoles in accordance with the priority order. Then, noise distribution is estimated in response to a minimum value of the evaluation function. So, the dipole distribution is estimated using the noise distribution. Thus, it is possible to obtain estimation results which are represented by a direction and magnitude of the equivalent current dipole as well as an appropriate number of equivalent current dipoles.
REFERENCES:
patent: 5263488 (1993-11-01), Van Veen et al.
patent: 5361774 (1994-11-01), Yamazaki et al.
patent: 5392210 (1995-02-01), Scholz
patent: 5417211 (1995-05-01), Abraham-Fuchs et al.
patent: 5730131 (1998-03-01), Ohyu
patent: 5797853 (1998-08-01), Musha et al.
H. Yamashita et al., "Nonlinear Programming", Science Technology Assn. of Japan , pp. 146-148, (1987).
Vapnik, "The Nature of Statiscal Learning Theory", Springer, New York, pp. 72-74, (1995).
Rissanen, "Modeling by Shortest Data Description", Automatica, vol. 14:465-471, (1978).
Ishiguro, "Information Theoretical Statistics", Kyoritsu Publication Co. of Japan, pp. 42-43, (1983).
Jaworski Francis J.
NEC Corporation
LandOfFree
Electrophysiological activity estimation method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrophysiological activity estimation method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrophysiological activity estimation method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2222542