Patent ID: 6665553
Filing Date: 2003-12-16
Classification: A61B,G01R

Abstract:
A biomagnetic field measuring apparatus for evaluating a rotational property of a current in a subject to be tested, comprising:a bed for holding the subject to be tested; a plurality of pickup coils arranged with respect to a measurement part of the subject; superconducting quantum interference devices for converting a biomagnetic field detected by said pickup coils into electric signals; a cryostat for holding said superconducting quantum interference devices at a low temperature; means for holding said cryostat; an operating circuit for driving said superconducting quantum interference devices; means for acquiring and analyzing signals, as a measured biomagnetic field, due to a magnetic flux detected by said superconducting quantum interference devices; display means for displaying analysis results obtained by said means for analyzing; wherein said means for analyzing calculates a current arrow at measurement positions of the measured biomagnetic field by partially differentiating the measured biomagnetic field, and discretely curvilinearly integrates a tangential component of the current arrow contacting a circumference which is at an arbitrary distance from each of the measurement positions so as to obtain an integrated value for each of the measurement positions; and wherein said display means displays the integrated values.