This title appears in the Scientific Report :
2006
Please use the identifier:
http://dx.doi.org/10.1088/0953-2048/19/5/S21 in citations.
Foetal magnetocardiogrphy with a multi-channel HTS rf SQUID gradiometer
Foetal magnetocardiogrphy with a multi-channel HTS rf SQUID gradiometer
Foetal magnetocardiography (fMCG) is a promising technique for prenatal cardiac diagnosis. In this paper, we discuss the special requirements of a system for fMCG measurements. A SQUID system incorporating five HTS rf SQUID magnetometers has been developed and constructed. Four magnetometers are arr...
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Personal Name(s): | Zhang, Y. |
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Wolters, N. / Lomparski, D. / Zander, W. / Banzet, M. / Schubert, J. / Krause, H.-J. / Geue, D. / van Leeuwen, P. | |
Contributing Institute: |
Institut für Halbleiterschichten und Bauelemente; ISG-1 Institut für Bio- und Chemosensoren; ISG-2 Center of Nanoelectronic Systems for Information Technology; CNI |
Published in: | Superconductor science and technology, 19 (2006) S. s266 - s270 |
Imprint: |
Bristol
IOP Publ.
2006
|
Physical Description: |
s266 - s270 |
DOI: |
10.1088/0953-2048/19/5/S21 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Superconductor Science and Technology
19 |
Subject (ZB): | |
Publikationsportal JuSER |
Foetal magnetocardiography (fMCG) is a promising technique for prenatal cardiac diagnosis. In this paper, we discuss the special requirements of a system for fMCG measurements. A SQUID system incorporating five HTS rf SQUID magnetometers has been developed and constructed. Four magnetometers are arranged at the bottom of the cryostat in a 4 cm x 4 cm square configuration. One reference magnetometer is located 20 cm above the plane to form four first-order axial gradiometers with the four bottom magnetometers. The magnetometer with a 18 mm diameter flux focuser, which reaches a field sensitivity of 20-30 fT Hz(-1/2), proved sufficient for recording foetal magnetocardiograms in a magnetically shielded room. The cardiac activities of two foetuses (31st and 33rd weeks of gestation) were recorded in 90 Hz bandwidth. The foetal QRS peak signals ranged from 4 to 7 pT and could easily be identified in the real-time gradiometer outputs with a signal-to-noise ratio of up to five. Furthermore, the averaged fMCG data enabled the determination of de- and repolarization time intervals. Overall, the fMCG signals proved of sufficient quality to perform foetal heart diagnostics. |