Mapping the cardiomagnetic field with 19 room temperature second-order gradiometers
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1
University of Fribourg, Switzerland
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2
Friedrich-Schiller-University, Biomagnetic Center, Germany
Objective: Optically pumped atomic magnetometers (LOPM) have become competitive with the well-established SQUID technology for recording biomagnetic fields. Since our first demonstration in 2003 [1] that a single gradiometer of two laser optically-pumped atomic magnetometers (LOPM) can be used for MCG mapping, we have struggled to develop multisensor arrays for recording field maps in clinically adapted measurement times. Methods: The field sensing element is a room-temperature Cs vapor contained in paraffin-coated cells [2]. The LOPM combines optical pumping by resonant laser light, rf-driven magnetic resonance, and laser readout to measure the magnetic field via spin precession. Digital phase detectors are used to either lock the field to the rf drive, or vice-versa. Coils permit feedback stabilization of the field in each sensor. With a set of feedback loops we have made 19 second order gradiometers (19+3+3 sensors in three planes) operated in an Al shielding room. RESULTS: The system has been successfully used [3] for recording heart field maps of more than 20 healthy subjects. Measurements on cardiac patients are in preparation and results shall be presented. Conclusion: We have demonstrated that a multisensor arrangement of laser pumped atomic magnetometers can be used for the simultaneous recording of cardiomagnetic field maps at 19 grid points in less than 2 minutes.
References
1. Bison G, Wynands R, Weis A (2003) Dynamical mapping of the human cardiomagnetic field with a room-temperature, laser-optical sensor, Opt. Expr. 11,904.
2. Castagna N, Bison G, Di Domenico G, Hofer A, Knowles P, Macchione C, Saudan H, Weis A (2009) A large sample study of spin relaxation and magnetometric sensitivity of paraffin-coated Cs vapor cells, Appl. Phys. B96, 763-772.
3. Bison G, Castagna N, Hofer A, Knowles P, Schenker J-L, Kasprzak M, Saudan H, Weis A (2009) A room temperature 19-channel magnetic field mapping device for cardiac signals, Appl. Phys. Lett. 95, 173701.
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:
Weis
A,
Bison
G,
Castagna
N,
Hofer
A,
Knowles
P,
Schenker
J and
Kasprzak
M
(2010). Mapping the cardiomagnetic field with 19 room temperature second-order gradiometers.
Front. Neurosci.
Conference Abstract:
Biomag 2010 - 17th International Conference on Biomagnetism .
doi: 10.3389/conf.fnins.2010.06.00351
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Received:
07 Apr 2010;
Published Online:
07 Apr 2010.
*
Correspondence:
Antoine Weis, University of Fribourg, Fribourg, Switzerland, antoine.weis@unifr.ch