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1994•IEEE Translation Journal on Magnetics in JapanRequires access

Measurements of Biomagnetism with a Magnetic Shield for a High-Tc Superconductor

Kazutomo Hoshino, Atsushi Koike, Hirofumi Kotaka, Eichi Sudoh, Hiroshi Ohta, Y. Uchikawa, Yasuharu Yamada

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Abstract

We developed a helmet-sized superconducting magnetic shield for a high-TcBi-Pb-Sr-Ca-Cu-O superconductor. The shield is 32 cm in diameter, 60 cm in depth, and 2.5 cm thick. It was experimentally confirmed that the container can reduce a weak magnetic field by -100 dB or to 1/100,000. The shielding effect of the superconducting container does not decrease even at frequencies as low as 0.2 Hz. Using equipment consisting of a superconducting container, a cryostat to keep the container at liquid nitrogen temperature, and an rf SQUID gradiometer, we successfully detected the magnetic fields of a human brain. We detected somatosensory magnetic fields by stimulating the tibial nerves of the patient with current pulses.

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What this paper is about

We developed a helmet-sized superconducting magnetic shield for a high-TcBi-Pb-Sr-Ca-Cu-O superconductor. The shield is 32 cm in diameter, 60 cm in depth, and 2.5 cm thick. It was experimentally confirmed that the container can reduce a weak magnetic field by -100 dB or to 1/100,000. The shielding effect of the superconducting container does not decrease even at frequencies as low as 0.2 Hz. Using equipment consisting of a superconducting container, a cryostat to keep the container at liquid nitrogen temperature, and an rf SQUID gradiometer, we successfully detected the magnetic fields of a human brain. We detected somatosensory magnetic fields by stimulating the tibial nerves of the patient with current pulses.

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Available abstract

We developed a helmet-sized superconducting magnetic shield for a high-TcBi-Pb-Sr-Ca-Cu-O superconductor. The shield is 32 cm in diameter, 60 cm in depth, and 2.5 cm thick. It was experimentally confirmed that the container can reduce a weak magnetic field by -100 dB or to 1/100,000. The shielding effect of the superconducting container does not decrease even at frequencies as low as 0.2 Hz. Using equipment consisting of a superconducting container, a cryostat to keep the container at liquid nitrogen temperature, and an rf SQUID gradiometer, we successfully detected the magnetic fields of a human brain. We detected somatosensory magnetic fields by stimulating the tibial nerves of the patient with current pulses.

Key concepts: Gradiometer, Cryostat, Biomagnetism, Superconductivity, Materials science, Electromagnetic shielding, Shield, Squid

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