Magnetocardiography of animals in magnetically shielded environment with active compensation

H. E. Horng*, S. H. Liao, S. J. Hsu, H. C. Yang, J. Y. Wu, C. C. Chen, C. H. Wu, C. C. Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A high-Tc 1st-order electronic superconducting quantum interference device (SQUID) gradiometer system is constructed to study the magnetocardiogram (MCG) of rabbits in a moderately magnetically shielded environment with active compensation. In the noisy hospital environment, the noise cannot be completely reduced with the 1st-order gradiometer, therefore, a reference SQUID with active compensation was used to further reduce the noise level leaking into the room. The MCG system was equipped with a x-y translation bed. We used a low-pass filter with the cut off frequency at 44 Hz, a high-pass filter with the cut off frequency at 0.1 Hz and the 60 Hz notch filter to reduce the power line interference. The noise level of the 1st order gradiometer MCG system in this moderately magnetically shielded room was about 1 pT/Hz1/2 at 1 Hz. The MCG of a normal rabbits was measured with this system and a MCG contour map and a current density distribution was constructed.

Original languageEnglish
JournalNeurology and Clinical Neurophysiology
Publication statusPublished - 2004


  • Interference device gradiometers
  • Magnetocardiogram
  • Magnetometer

ASJC Scopus subject areas

  • General Neuroscience


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