Magnetoresistive hybrid sensors for simultaneous low-field MRI and biomagnetic measurements
Low-field magnetic resonance imaging (MRI) and Biomagnetic measurements like neural signal detection (MEG) require sensitive magnetometers for the detection of corresponding very weak magnetic signals. Recently developed magnetoresistive hybrid sensors can be ultra-sensitive magnetometers [1]. They could detect magnetic signal in femtotesla range. These sensors are the combination of a field Giant Magnetoresistive (GMR) sensor and a flux-to-field superconducting transformer. Main advantages of these sensors are their robustness against external static fields and fast recovery after RF pulses. They have been succesfully incorporated in an NMR setup[2] with static fields up to 8mT and without a dedicated shielded room. These devices are also good candidates for the biomagnetic signal detection [3]. Furthermore, these sensors have been implemented in a Magnetic Resonance Imaging (MRI) system working at very low fields. We will present MRI images obtained at low field without pre-polarization. It is also possible to combine the low-field MRI based on mixed sensors with neural signal detection (MEG). The perspectives of such device development will be presented. This work was supported by the European project MEGMRI.
References
1. M. Pannetier et al, Science, 304, 1648-1650, (2004)
2. N. Sergeeva-Chollet et al, this conference
3. H. Polovy et al, this conference
Conference:
Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010.
Presentation Type:
Oral Presentation
Topic:
Instrumentation and Multi-modal Integrations: MEG, Low-field MRI,EEG, fMRI,TMS,NIRS
Citation:
Sergeeva-Chollet
N,
Dyvorne
H,
Polovy
H,
Pannetier-Lecoeur
M and
Fermon
C
(2010). Magnetoresistive hybrid sensors for simultaneous low-field MRI and biomagnetic measurements.
Front. Neurosci.
Conference Abstract:
Biomag 2010 - 17th International Conference on Biomagnetism .
doi: 10.3389/conf.fnins.2010.06.00004
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Received:
18 Mar 2010;
Published Online:
18 Mar 2010.
*
Correspondence:
Natalia Sergeeva-Chollet, CEA, Gif-sur-Yvette, France, natalia.sergeeva-chollet@cea.fr