Acquisition of fetal magnetocardiograms in an unshielded hospital setting

A. Brazdeikis, G. J. Vázquez-Flores, I. C. Tan, N. S. Padhye, M. T. Verklan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The acquisition of fetal magnetocardiographic signals in various noisy environments is studied, and improvement in the signal-to-noise ratio (SNR) of weak biomagnetic signals is investigated for various noise levels and gradiometer implementations. There is a consistent improvement in the SNR as fetal gestation age (GA) increases. The SNR in unshielded environment is shown to be acceptable over a wide range of GA values when using the second-order gradiometers with a field balance CB = 5 × 10-4 and a gradient balance CG1 = 5 × 10-3 or better. It is also shown that the optimal gradiometer baseline length strongly depends on the ambient noise level and the overall gradiometer balance. Shorter (<80 mm) baselines are preferred only when using highly balanced gradiometers in a very high noise environments.

Original languageEnglish (US)
Pages (from-to)823-826
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
StatePublished - Jun 2007
Externally publishedYes


  • Biomagnetic modeling
  • Biomagnetic signal detection
  • Fetal magnetocardiography
  • SQUID magnetometers
  • Unshielded environment

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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