Magnetocardiography with a GMR-based mixed sensor
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1
CEA, France
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2
CEA Saclay, SPEC-IRAMIS-DSM, France
We have developed a sensor based on the Giant Magneto-Resistive (GMR) effect, associated to a superconducting flux-to-field transformer, which allows femtotesla field detection in a wide range of frequencies [1]. Here we report Magneto-Cardiographic (MCG) measurements performed at 4K and 77K with these sensors in the CEA-Neurospin magnetically shielded room. MCG has been recorded at various locations over the chest of a healthy volunteer. Artifacts effects have also been recorded; in particular Ballisto-Cardiography (BCG) measurements are presented. These sensors offer new technological route to biomagnetic signal measurements. Their present limitation is a low frequency 1/f noise which appears below few kHz. We will present a technique based on supercurrent switching which reduces this low frequency noise. This will allow reaching sensitivity in the femtotesla range at 1Hz to perform Magneto-Encephalographic (MEG) recordings.
References
1. M. Pannetier et al, Science, 304, 1648-1650, (2004)
Conference:
Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010.
Presentation Type:
Poster Presentation
Topic:
MCG: Instrumentation, Modeling, Basic and Clinical Studies
Citation:
Polovy
H,
Cannies
G,
Fermon
C and
Pannetier-Lecoeur
M
(2010). Magnetocardiography with a GMR-based mixed sensor.
Front. Neurosci.
Conference Abstract:
Biomag 2010 - 17th International Conference on Biomagnetism .
doi: 10.3389/conf.fnins.2010.06.00352
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Received:
07 Apr 2010;
Published Online:
07 Apr 2010.
*
Correspondence:
Hedwige Polovy, CEA, Gif-sur-Yvette, France, hedwige.polovy@cea.fr