Multichannel heart scanner based on high-Tc SQUIDs

H.J.M. ter Brake; N. Janssen; J. Flokstra; D. Veldhuis; H. Rogalla

doi:10.1109/77.621758

Multichannel heart scanner based on high-Tc SQUIDs

H.J.M. ter Brake, N. Janssen, J. Flokstra, D. Veldhuis, H. Rogalla

Research output: Contribution to journal › Article › Academic › peer-review

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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

Original language	English
Pages (from-to)	2545-2548
Number of pages	4
Journal	IEEE transactions on applied superconductivity
Volume	7
Issue number	2
DOIs	https://doi.org/10.1109/77.621758
Publication status	Published - 1997
Event	1996 Applied Superconductivity Conference, ASC 1996 - David L. Lawrence Convention Center, Pittsburgh, United States Duration: 25 Aug 1996 → 30 Aug 1996

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title = "Multichannel heart scanner based on high-Tc SQUIDs",

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",

author = "{ter Brake}, H.J.M. and N. Janssen and J. Flokstra and D. Veldhuis and H. Rogalla",

year = "1997",

doi = "10.1109/77.621758",

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journal = "IEEE transactions on applied superconductivity",

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T1 - Multichannel heart scanner based on high-Tc SQUIDs

AU - ter Brake, H.J.M.

AU - Janssen, N.

AU - Flokstra, J.

AU - Veldhuis, D.

AU - Rogalla, H.

PY - 1997

Y1 - 1997

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AB - 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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DO - 10.1109/77.621758

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