Second-order, high-temperature superconducting gradiometer for magnetocardiography in unshielded environment | Zendy

Y. Zhang | Zendy; G. Panaitov | Zendy; S. G. Wang | Zendy; N. Wolters | Zendy; R. Otto | Zendy; J. Schubert | Zendy; W. Zander | Zendy; HansJoachim Krause | Zendy; Helmut Soltner | Zendy; Herbert Bousack | Zendy; A. I. Braginski | Zendy

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Second-order, high-temperature superconducting gradiometer for magnetocardiography in unshielded environment

Author(s) -

Y. Zhang,

G. Panaitov,

S. G. Wang,

N. Wolters,

R. Otto,

J. Schubert,

W. Zander,

HansJoachim Krause,

Helmut Soltner,

Herbert Bousack,

A. I. Braginski

Publication year - 2000

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.125625

Subject(s) - gradiometer , magnetocardiography , magnetometer , physics , superconductivity , squid , bandwidth (computing) , resonator , nuclear magnetic resonance , optoelectronics , materials science , magnetic field , condensed matter physics , telecommunications , engineering , ecology , quantum mechanics , biology

By employing high-temperature superconducting quantum interference device (SQUID) magnetometers, we have assembled a second-order gradiometer for magnetocardiography (MCG) in unshielded environment. With this high-temperature superconductor (HTS) SQUID system, we demonstrated its diagnostic relevance for MCG in terms of signal-to-noise ratio, spatial resolution, frequency bandwidth, rejection of environmental disturbances, and long-term stability. The electronically balanced gradiometer consists of three HTS radio-frequency SQUIDs with superconducting coplanar resonators, mounted in axial gradiometric arrangement with a baseline of 7.5 cm. The system achieves a common mode rejection for axial homogeneous fields of about 104 without any mechanical balancing, and a white noise about 130 fT/√Hz at 77 K, with an 8×8 mm2 flux pickup area. MCG maps above volunteers’ chests have been recorded in unshielded environment in a bandwidth of about 130 Hz. We showed the influence of several notch filters (suppressing t...

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