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 journalArticle

7 Citations (Scopus)

Abstract

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
Volume15
Issue number1
DOIs
Publication statusPublished - Jan 2002
Externally publishedYes

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gradiometers
SQUIDs
charts
P waves
dipoles
gradients
synchronism

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

A signal-to-noise chart for designing planar high-Tc SQUID gradiometers for magnetocardiographs. / Yokosawa, Koichi; Tsukamoto, Akira; Miyashita, Tsuyoshi; Kandori, Akihiko; Suzuki, Daisuke; Tsukada, Keiji; Takagi, Kazumasa.

In: Superconductor Science and Technology, Vol. 15, No. 1, 01.2002, p. 136-140.

Research output: Contribution to journalArticle

Yokosawa, Koichi ; Tsukamoto, Akira ; Miyashita, Tsuyoshi ; Kandori, Akihiko ; Suzuki, Daisuke ; Tsukada, Keiji ; Takagi, Kazumasa. / A signal-to-noise chart for designing planar high-Tc SQUID gradiometers for magnetocardiographs. In: Superconductor Science and Technology. 2002 ; Vol. 15, No. 1. pp. 136-140.
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