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

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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",

language = "English",

volume = "7",

pages = "2545--2548",

journal = "IEEE transactions on applied superconductivity",

issn = "1051-8223",

publisher = "IEEE",

number = "2",

note = "1996 Applied Superconductivity Conference, ASC 1996, ASC ; Conference date: 25-08-1996 Through 30-08-1996",

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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

N2 - 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

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

U2 - 10.1109/77.621758

DO - 10.1109/77.621758

M3 - Article

VL - 7

SP - 2545

EP - 2548

JO - IEEE transactions on applied superconductivity

JF - IEEE transactions on applied superconductivity

SN - 1051-8223

IS - 2

T2 - 1996 Applied Superconductivity Conference, ASC 1996

Y2 - 25 August 1996 through 30 August 1996

ER -

Multichannel heart scanner based on high-Tc SQUIDs

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