A signal-to-noise chart for designing planar high-Tc SQUID gradiometers for magnetocardiographs

Koichi Yokosawa, Akira Tsukamoto, Tsuyoshi Miyashita, Akihiko Kandori, Daisuke Suzuki, Keiji Tsukada, Kazumasa Takagi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


To design practical planar high-Tc SQUID gradiometers for magnetocardiographs, a signal-to-noise (S/N) chart that will enable the gradiometers to detect P-waves was developed. The signal was estimated as the gradient field generated by the mean current dipole of P-waves of 20 healthy volunteers. The current dipoles were obtained by using a conventional magnetocardiograph comprising low-Tc SQUID gradiometers. On the other hand, the noise was estimated from studies on previously reported gradiometers based on the limit of intrinsic gradient field noise. The obtained S/N chart indicates that a gradiometer with a baseline longer than 12 mm is necessary for detecting P-waves without averaging. The reliability of the S/N chart was confirmed by detecting actual P-waves with 100-beat averaging by using a fabricated planar high-Tc SQUID gradiometer with a baseline of 6.75 mm.

Original languageEnglish
Pages (from-to)136-140
Number of pages5
JournalSuperconductor Science and Technology
Issue number1
Publication statusPublished - Jan 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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