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30 Jun 2003

Volume 82, Issue 26, pp. 4633-4843

Issue Cover Spotlight Figure

Appl. Phys. Lett. 82, 4797 (2003); http://dx.doi.org/10.1063/1.1587262 (3 pages)

Ongi Englander, Dane Christensen, and Liwei Lin
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Magnetocardiograph based on a 4×4 array of high-temperature superconducting quantum interference devices

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

Appl. Phys. Lett. 82, 4833 (2003); http://dx.doi.org/10.1063/1.1588737 (3 pages) | Cited 9 times

Online Publication Date: 24 June 2003

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A magnetocardiograph, consisting of superconducting quantum interference device (SQUID) magnetometers made of a high-critical-temperature (Tc) superconductor and a compact magnetically shielding cylinder, has been developed. We assembled a sensor array of 4×4-matrix-arranged magnetometers which are treated as 24 electronic first-order gradiometers by taking the differences between the outputs in every pair of adjacent magnetometers. Field gradients generated by P waves were estimated from the results for 21 subjects of a conventional magnetocardiograph made of low-Tc SQUID gradiometers. Every gradiometer of the assembled sensor array was then designed to be sufficiently sensitive to detect the field gradient corresponding to the mean P wave. The clear magnetocardiograms obtained without averaging indicate the clinical applicability of the developed magnetocardiograph. © 2003 American Institute of Physics.
Show PACS
87.80.-y Biophysical techniques (research methods)
07.55.Ge Magnetometers for magnetic field measurements
85.25.Dq Superconducting quantum interference devices (SQUIDs)
87.19.Hh Cardiac dynamics
87.50.C- Static and low-frequency electric and magnetic fields effects
07.55.Nk Magnetic shielding in instruments
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