EQUIVALENT DIPOLE MEASURING APPARATUS AND EQUIVALENT DIPOLE ESTIMATING METHOD

摘要

PURPOSE:To remove all of errors in equivalent dipole operation by preliminarily calculating correction quantity correcting the position or vector component of an equivalent dipole estimated from a measured value by operation and correcting the estimation value of the equivalent dipole from the measured value of the electric or magnetic field on the surface of a living body on the basis of the correction quantity. CONSTITUTION:The transmission matrix of the positions of electrode groups 5 indicated when it is supposed that a current dipole is placed in the predetermined position in the skull is operated by the operation means 9b of a computer 9 and the potentials of the respective electrode positions generated by the current dipole are calculated. The square error of the generated potentials at the electrode positions on the scalp and actually measured potentials is calculated at every equivalent dipole and, when the value of the square error is converged to become a reference value or less, the current dipole in the position is set to the equivalent dipole due to operation and the correction quantity corresponding to the position of the equivalent dipole calculated by actually inserting a dipole power supply in a living body is read from memories 20, 13 and the equivalent dipole due to operation is corrected on the basis of the correction quantity.