Surgery – Truss – Pad
Patent
1994-06-30
1996-03-05
Smith, Ruth S.
Surgery
Truss
Pad
324244, 324248, 364577, A61B 505
Patent
active
054958490
ABSTRACT:
In a method/apparatus of the present invention, a plurality or pickup coils are employed at a plurality of detection points so as to measure magnetic field intensities induced from electric current generated on living organ: the detection points are spatially interpolated/extrapolated; equations to determine relations of a hypothetically located current to the magnetic field intensities at the detection points and the interpolated detection points are established; the magnetic field intensities are measured with the pickup coils; magnetic field intensities are estimated at the interpolated/extrapolated detection points from the magnetic field intensities measured by the pickup coils; and the hypothetically located electric current is calculated by applying said magnetic field intensities at the detection points and said interpolated/extrapolated detection points to said equation. Thus, the electric current value is estimated. The calculation is preferably carried out by a SVD method, where the hypothetically located current is placed at plural current source positions. Matrix constants in the SVD calculation is determined in advance to allow a quick calculation. The interpolated/extrapolated point may be determined according to a linear method or a spline method, or depending on the current location, or on the spatial differentiation of the magnetic field intensity, or may be changed with time.
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Goto Takao
Hayashi Takehiko
Nakashima Yoshiyasu
Shimura Takaki
Fujitsu Limited
Smith Ruth S.
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