生体磁気計測用磁気シールドルーム及びガントレの開発

概要

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Recently, in order to resolve bio-function and to make diagnosis, it becomes popular to measure weak magnetic fields from brain by using SQUID (Superconducting Quantum Interference Device) magnetometer with extremely higher sensitivity. For the fundamental study of the brain, a new 19-channel SQUID magnetometer system, which would be easy to operate and less expensive than the commercial base systems consisting of multi-channel SQUID sensors with the first order gradiometers and a magnetically shielded room with higher shielding factor of over 1000, has been developed. The total hardware system consists of 19 sensors with the second order gradiometers, readout elecronics, a liquid helium dewar, a gantry and a prefabricated magnetically shielded room (PMSR). By using PMSR with moderate shielding factor of around 20 and the second order gradiometers, magnetic noise which is low enough for measuring brain fields can be achieved. In this paper, first, design concepts of PMSR and a gantry developed as a peripheral equipment of this system are explained. Second, the magnetic shielding effect, electromagnetic shielding effect and evaluation on the magnetic noise due to vibration of the shielded room and gantry are discussed.
社団法人日本建築学会の論文
1995-12-20