Multichannel heart scanner based on high-Tc SQUIDs


Brake, H.J.M. ter and Janssen, N. and Flokstra, J. and Veldhuis, D. and Rogalla, H. (1997) Multichannel heart scanner based on high-Tc SQUIDs. IEEE Transactions on Applied Superconductivity, 7 (2). pp. 2545-2548. ISSN 1051-8223

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Abstract:A 7-channel magnetometer for magnetocardiography based on high-T c SQUIDs has been realized. This magnetometer is used for test experiments in the development of a multichannel high-Tc SQUID based heart-scanner for clinical applications. The intrinsic noise level of the channels in the 7-channel system is typically 120 fT/¿(Hz) down to 1 Hz. Magnetocardiograms were recorded inside a magnetically shielded room. Introductory experiments were performed on the suppression of noise by combining magnetometers to form planar gradiometers. The noise suppression that can be established appeared to be limited by the imbalance of the gradiometric configuration, which is roughly 2%. This relatively poor balance of the system is caused by inaccuracies in the transfer functions of the individual SQUID magnetometers, and by deviations from the planar geometry
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Copyright:©1997 IEEE
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