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YBa2Cu3O7 thin film SQUID gradiometer for biomagnetic measurements (1993)

Tavrin, Y. ; Zhang, Y. ; Mück, M. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 62 (1993), S. 1824-1826

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Low-noise rf SQUID washers fabricated from YBa2Cu3O7 epitaxial thin films have been used to construct a first-order electronic gradiometer operating at 77 K and suitable for biomagnetic measurements. Mechanical adjustment of the two-SQUID gradiometric setup made it possible to attenuate signals due to far magnetic field sources by three orders of magnitude. A magnetic field resolution of ≤280 fT/Hz1/2 above 2 Hz was attained through the use of large flux focusers. The fine structure of human heart magnetocardiograms was recorded in unshielded space. In a shielded room, magnetoencephalograms were obtained. The system was used to obtain new data on auditory evoked cortical response.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.109561

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Magnetoencephalography using high temperature rf SQUIDs (1993)

Zhang, Y. ; Tavrin, Y. ; Mück, M. ; [et al.]

Springer

Brain topography 5 (1993), S. 379-382

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ISSN: 1573-6792

Keywords: High-temperature superconductor ; Thin-film ; SQUID ; Biomagnetism ; Diagnostics ; Magnetoencephalography ; Auditory evoked fields

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary We have developed high-critical-temperature radio-frequency Super conducting QUantum Interference Devices (SQUIDs) with step-edge grain-boundary Josephson junctions and large flux focusers. These planar devices were fabricated from epitaxial YBa2Cu3O7 films and operated in the magnetometer and first-order gradiometer configurations while immersed in liquid nitrogen. At the temperature of 77K, we have attained a magnetic field resolution for the magnetometer better than 200 fT/Hz1/2 down to less than 1 Hz, i.e., over the low signal frequency range important for medical diagnostics. The results to date show a high promise for biomagnetic diagnostics. For the first time, we recorded the evoked responses from human brains using a high-temperature magnetometer and a first-order electronic gradiometer channel simultaneously. These results were obtained in a magnetically shielded room. An improvement in the magnetic field resolution by another order of magnitude is possible and probable.