Double Relaxation Oscillation SQUID Systems for Biomagnetic Multichannel Measurements

Yong-Ho LEE; Hyukchan KWON; Jin-Mok KIM; Kiwoong KIM; In-Seon KIM; Yong-Ki PARK

doi:10.1093/ietele/e88-c.2.168

Double Relaxation Oscillation SQUID Systems for Biomagnetic Multichannel Measurements

Yong-Ho LEE, Hyukchan KWON, Jin-Mok KIM, Kiwoong KIM, In-Seon KIM, Yong-Ki PARK

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Multichannel superconducting quantum interference device (SQUID) systems based on double relaxation oscillation SQUIDs (DROS) were developed for measuring magnetocardiography (MCG) and magnetoencephalography (MEG) signals. Since DROS provides large flux-to-voltage transfer coefficients, about 10 times larger than the DC SQUIDs, direct readout of the SQUID output was possible using compact room-temperature electronics. Using DROSs, we fabricated two types of multichannel systems; a 37-channel magnetometer system with circular sensor distribution for measuring radial components of MEG signals, and two planar gradiometer systems of 40-channel and 62-channel measuring tangential components of MCG or MEG signals. The magnetometer system has external feedback to eliminate magnetic coupling with adjacent channels, and reference vector magnetometers were installed to form software gradiometers. The field noise of the magnetometers is around 3 fT/ at 100 Hz inside a magnetically shielded room. The planar gradiometer systems have integrated first-order gradiometer in thin-film form with a baseline of 40 mm. The magnetic field gradient noise of the planar gradiometers is about 1 fT/cm/ at 100 Hz. The planar gradiometers were arranged to measure field components tangential to the body surface, providing efficient measurement of especially MCG signals with smaller sensor coverage than the conventional normal component measurements.

Publication: IEICE TRANSACTIONS on Electronics Vol.E88-C No.2 pp.168-174

Publication Date: 2005/02/01

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DOI: 10.1093/ietele/e88-c.2.168

Type of Manuscript: Special Section INVITED PAPER (Special Section on Superconducting Electronic Devices and Their Applications)

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Yong-Ho LEE, Hyukchan KWON, Jin-Mok KIM, Kiwoong KIM, In-Seon KIM, Yong-Ki PARK, "Double Relaxation Oscillation SQUID Systems for Biomagnetic Multichannel Measurements" in IEICE TRANSACTIONS on Electronics, vol. E88-C, no. 2, pp. 168-174, February 2005, doi: 10.1093/ietele/e88-c.2.168.
Abstract: Multichannel superconducting quantum interference device (SQUID) systems based on double relaxation oscillation SQUIDs (DROS) were developed for measuring magnetocardiography (MCG) and magnetoencephalography (MEG) signals. Since DROS provides large flux-to-voltage transfer coefficients, about 10 times larger than the DC SQUIDs, direct readout of the SQUID output was possible using compact room-temperature electronics. Using DROSs, we fabricated two types of multichannel systems; a 37-channel magnetometer system with circular sensor distribution for measuring radial components of MEG signals, and two planar gradiometer systems of 40-channel and 62-channel measuring tangential components of MCG or MEG signals. The magnetometer system has external feedback to eliminate magnetic coupling with adjacent channels, and reference vector magnetometers were installed to form software gradiometers. The field noise of the magnetometers is around 3 fT/ at 100 Hz inside a magnetically shielded room. The planar gradiometer systems have integrated first-order gradiometer in thin-film form with a baseline of 40 mm. The magnetic field gradient noise of the planar gradiometers is about 1 fT/cm/ at 100 Hz. The planar gradiometers were arranged to measure field components tangential to the body surface, providing efficient measurement of especially MCG signals with smaller sensor coverage than the conventional normal component measurements.
URL: https://globals.ieice.org/en_transactions/electronics/10.1093/ietele/e88-c.2.168/_p

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@ARTICLE{e88-c_2_168,
author={Yong-Ho LEE, Hyukchan KWON, Jin-Mok KIM, Kiwoong KIM, In-Seon KIM, Yong-Ki PARK, },
journal={IEICE TRANSACTIONS on Electronics},
title={Double Relaxation Oscillation SQUID Systems for Biomagnetic Multichannel Measurements},
year={2005},
volume={E88-C},
number={2},
pages={168-174},
abstract={Multichannel superconducting quantum interference device (SQUID) systems based on double relaxation oscillation SQUIDs (DROS) were developed for measuring magnetocardiography (MCG) and magnetoencephalography (MEG) signals. Since DROS provides large flux-to-voltage transfer coefficients, about 10 times larger than the DC SQUIDs, direct readout of the SQUID output was possible using compact room-temperature electronics. Using DROSs, we fabricated two types of multichannel systems; a 37-channel magnetometer system with circular sensor distribution for measuring radial components of MEG signals, and two planar gradiometer systems of 40-channel and 62-channel measuring tangential components of MCG or MEG signals. The magnetometer system has external feedback to eliminate magnetic coupling with adjacent channels, and reference vector magnetometers were installed to form software gradiometers. The field noise of the magnetometers is around 3 fT/ at 100 Hz inside a magnetically shielded room. The planar gradiometer systems have integrated first-order gradiometer in thin-film form with a baseline of 40 mm. The magnetic field gradient noise of the planar gradiometers is about 1 fT/cm/ at 100 Hz. The planar gradiometers were arranged to measure field components tangential to the body surface, providing efficient measurement of especially MCG signals with smaller sensor coverage than the conventional normal component measurements.},
keywords={},
doi={10.1093/ietele/e88-c.2.168},
ISSN={},
month={February},}

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TY - JOUR
TI - Double Relaxation Oscillation SQUID Systems for Biomagnetic Multichannel Measurements
T2 - IEICE TRANSACTIONS on Electronics
SP - 168
EP - 174
AU - Yong-Ho LEE
AU - Hyukchan KWON
AU - Jin-Mok KIM
AU - Kiwoong KIM
AU - In-Seon KIM
AU - Yong-Ki PARK
PY - 2005
DO - 10.1093/ietele/e88-c.2.168
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E88-C
IS - 2
JA - IEICE TRANSACTIONS on Electronics
Y1 - February 2005
AB - Multichannel superconducting quantum interference device (SQUID) systems based on double relaxation oscillation SQUIDs (DROS) were developed for measuring magnetocardiography (MCG) and magnetoencephalography (MEG) signals. Since DROS provides large flux-to-voltage transfer coefficients, about 10 times larger than the DC SQUIDs, direct readout of the SQUID output was possible using compact room-temperature electronics. Using DROSs, we fabricated two types of multichannel systems; a 37-channel magnetometer system with circular sensor distribution for measuring radial components of MEG signals, and two planar gradiometer systems of 40-channel and 62-channel measuring tangential components of MCG or MEG signals. The magnetometer system has external feedback to eliminate magnetic coupling with adjacent channels, and reference vector magnetometers were installed to form software gradiometers. The field noise of the magnetometers is around 3 fT/ at 100 Hz inside a magnetically shielded room. The planar gradiometer systems have integrated first-order gradiometer in thin-film form with a baseline of 40 mm. The magnetic field gradient noise of the planar gradiometers is about 1 fT/cm/ at 100 Hz. The planar gradiometers were arranged to measure field components tangential to the body surface, providing efficient measurement of especially MCG signals with smaller sensor coverage than the conventional normal component measurements.
ER -