Multichannel heart scanner based on high-Tc SQUIDs

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

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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 languageEnglish
Pages (from-to)2545-2548
Number of pages4
JournalIEEE transactions on applied superconductivity
Volume7
Issue number2
DOIs
Publication statusPublished - 1997
Event1996 Applied Superconductivity Conference, ASC 1996 - David L. Lawrence Convention Center, Pittsburgh, United States
Duration: 25 Aug 199630 Aug 1996

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SQUIDs
Magnetometers
magnetometers
scanners
Magnetocardiography
magnetocardiography
retarding
gradiometers
transfer functions
rooms
Transfer functions
Experiments
deviation
Geometry
geometry
configurations

Cite this

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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",
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Multichannel heart scanner based on high-Tc SQUIDs. / ter Brake, H.J.M.; Janssen, N.; Flokstra, J.; Veldhuis, D.; Rogalla, H.

In: IEEE transactions on applied superconductivity, Vol. 7, No. 2, 1997, p. 2545-2548.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

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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