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Superconducting quantum interference device (SQUID) is based on the macroscopic quantum phenomena in the superconductor; flux quantization and Josephson effect. When the SQUID is applied for the detection of magnetic fields, SQUID can be a very sensitive magnetometer.
One of the successful applications of SQUID is biomagnetic measurement,
for example, magnetocardiography (heart) and magnetoencephalography (brain).
In order to measure magnetic field distributions in ahort time, we need
a multichannel SQUID system with sensor coverage area large enough to cover
the major part of the organ to be measured.
The technical element of biomagnetic measurement includes, SQUID sensors, control electronics for SQUID, cooling dewar, magnetic shielding, software for signal processing and analysis.
In this talk, multichannel systems for heart and brain measurements will be introduced, starting from sensors to systems, such as
64-channel systems for heart measurement and 150-channel system forbrain measurement
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