Method and apparatus for deducing bioelectric current sources

Details Method and apparatus for deducing bioelectric current sources Method and apparatus for deducing bioelectric current sources

1996-10-29

1998-05-26

Casler, Brian L.

Surgery

Truss

Pad

128731, 324244, 324248, 324260, A61B 505

Patent

active

057552274

ABSTRACT:
A method and apparatus for deducing physical quantities such as positions, sizes and orientations of bioelectric current sources. Minute magnetic fields formed by the bioelectric current sources in a region under examination of an examinee are measured with a plurality of magnetic sensors arranged adjacent the region under examination. A plurality of lattice points are set in the region under examination. Physical quantities of the current sources are derived by solving a relational expression of unknown current sources at the lattice points and field data provided by the magnetic sensors, with a condition added thereto to minimize a norm of a vector having the current source at each of the lattice points. The lattice points are moved toward a lattice point having a large current value among the current sources computed. Checking is made whether a minimum distance among the lattice points having been moved is below a predetermined value. The current source computing step to the checking step are repeated for the lattice points having been removed, when the minimum distance exceeds the predetermined value, and the current source corresponding to a magnetic field occurring when the minimum distance is determined to be below the predetermined value is identified to be a true current source.

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1256 IEEE Engineering in Medicine & Biology, Society 11th Annual International Conference, "New Approaches to Source Localization in Meg," Christopher W. Crowley, et al, Biomagnetic Technologies, Inc., San Diego, CA. Nov. 1989.
8088 IEEE Transactions on Biomedical Engineering, 39 (1992) Jun., No. 6, New York, US, "Maximum-Likelihood Estimation of Current-Dipole Parameters for Data Obtained Using Multichannel Magnetometer".
8078 Proceedings of the IEEE, 78 (1990), Jun. No. 6, New York, US, pp. 973-989, "A Review of Magnetic Sensors," James E. Lenz.

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