Biomagnetic field measuring apparatus

A biomagnetic field measuring apparatus comprising:

• a bed for holding a subject to be tested;
• a plurality of pickup coils arranged in a magnetocardiogram measurement part of the subject to be tested;
• superconducting quantum interference devices for converting the magnetic 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 of magnetometer for driving said superconducting quantum interference devices;
• means for acquiring and analyzing signals due to the magnetic flux detected by said superconducting quantum interference devices;
• and
• display means for displaying thereon the analysis results,
• wherein the analysis results subjected to the signal process including (1) a process for calculating a pseudo-current by differentiating partially the measured magnetic field with respect to the measurement position, and (2) a process for integrating curvilinearly the pseudo-current, contacting a circumference, on the circumference which is at an arbitrary distance, within an area having said pickup coils arranged therein, when viewed from a measurement position for the magnetic field are displayed on said display means.