The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
우리는 여기에서 다중 채널 고속 개발에 대해 설명합니다.Tc 심장질환 진단의 미래 응용을 목표로 하는 심장 자기장 측정용 SQUID 자력계 시스템. 두 가지 유형의 직접 결합 SQUID 자력계가 제작되어 사용되었습니다. 즉 자속 침투와 그에 따른 저주파 잡음을 유도하는 차폐 전류를 억제하기 위한 자속 댐이 있는 단일 픽업 코일 자력계와 입자 경계 접합과 자속이 없는 이중 픽업 코일 자력계입니다. 픽업 코일의 댐. 두 자력계의 초전도막에는 구멍과 슬롯이 있어 5μm 너비의 스트립 라인을 남겨 환경 장에서 자속 소용돌이의 포획 및 침투를 억제했습니다. 우리는 MSR(자기 차폐실)의 전계 감쇠 효율성을 강화하기 위해 다양한 능동 차폐 방식을 연구했습니다. MSR 벽에 감겨진 일반 감지 코일을 이용한 피드백형 보상과 적응형 필터를 통한 50Hz 잡음의 선택적 제거가 개발되었습니다. 단순한 MSR의 사용을 기반으로 하는 수동 및 능동 차폐의 이러한 조합은 임상 MCG 검사를 위한 실용적인 저비용 자력계 시스템에 적합합니다. 우리는 공기와 액체 질소 사이의 거리가 20mm인 평평한 바닥에 4cm 간격으로 최대 16개의 자력계 캡슐을 포함할 수 있는 액체 질소 저온 유지 장치를 제작했습니다. 저온 유지 장치는 개발된 능동 차폐와 결합된 중간 차폐 MSR에서 회전, 수직 및 수평 이동의 자유를 갖는 갠트리에 설치되었습니다. 동시에 작동하는 XNUMX개의 자력계를 사용하여 일반 피험자를 대상으로 MCG 측정을 수행했습니다.
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Shinya KURIKI, Hiroshi OYAMA, Amane HAYASHI, Satoru HIRANO, Tomoaki WASHIO, Mizushi MATSUDA, Koichi YOKOSAWA, "Development of a High-Tc SQUID-Based Magnetometer System for MCG Measurement" in IEICE TRANSACTIONS on Electronics,
vol. E85-C, no. 3, pp. 670-676, March 2002, doi: .
Abstract: We describe here development of a multichannel high-Tc SQUID magnetometer system for measurement of cardiac magnetic fields, aiming at future application of diagnosis of heart diseases. Two types of direct-coupled SQUID magnetometers were fabricated and used: single pickup coil magnetometer having flux dams to suppress the shielding current that would induce flux penetration and the consequent low-frequency noise, and double pickup coil magnetometer having no grain boundary junctions and flux dams on the pickup coil. The superconducting film of both the magnetometers had holes and slots, leaving 5 µm-wide strip lines, to suppress trapping and penetration of magnetic flux vortices in environmental fields. We studied different schemes of active shielding to reinforce the efficiency of field-attenuation of magnetically shielded room (MSR). A feedback-type compensation using a normal detection coil wound around the wall of MSR and a selective cancellation of 50 Hz noise by means of adaptive filter were developed. Such combination of passive and active shielding, based on the use of simple MSR, would be suitable in a practical low-cost magnetometer system for clinical MCG examination. We fabricated a liquid nitrogen cryostat that could contain up to 20 magnetometer-capsules at 4 cm separation in a flat bottom, with a distance of 16 mm between the air and liquid nitrogen. The cryostat was set in a gantry, which had rotational, vertical and horizontal freedoms of movement, in a moderate-shielding MSR that was combined with the developed active shielding. Measurements of MCG were performed for normal subject using eight magnetometers operating simultaneously.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e85-c_3_670/_p
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@ARTICLE{e85-c_3_670,
author={Shinya KURIKI, Hiroshi OYAMA, Amane HAYASHI, Satoru HIRANO, Tomoaki WASHIO, Mizushi MATSUDA, Koichi YOKOSAWA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Development of a High-Tc SQUID-Based Magnetometer System for MCG Measurement},
year={2002},
volume={E85-C},
number={3},
pages={670-676},
abstract={We describe here development of a multichannel high-Tc SQUID magnetometer system for measurement of cardiac magnetic fields, aiming at future application of diagnosis of heart diseases. Two types of direct-coupled SQUID magnetometers were fabricated and used: single pickup coil magnetometer having flux dams to suppress the shielding current that would induce flux penetration and the consequent low-frequency noise, and double pickup coil magnetometer having no grain boundary junctions and flux dams on the pickup coil. The superconducting film of both the magnetometers had holes and slots, leaving 5 µm-wide strip lines, to suppress trapping and penetration of magnetic flux vortices in environmental fields. We studied different schemes of active shielding to reinforce the efficiency of field-attenuation of magnetically shielded room (MSR). A feedback-type compensation using a normal detection coil wound around the wall of MSR and a selective cancellation of 50 Hz noise by means of adaptive filter were developed. Such combination of passive and active shielding, based on the use of simple MSR, would be suitable in a practical low-cost magnetometer system for clinical MCG examination. We fabricated a liquid nitrogen cryostat that could contain up to 20 magnetometer-capsules at 4 cm separation in a flat bottom, with a distance of 16 mm between the air and liquid nitrogen. The cryostat was set in a gantry, which had rotational, vertical and horizontal freedoms of movement, in a moderate-shielding MSR that was combined with the developed active shielding. Measurements of MCG were performed for normal subject using eight magnetometers operating simultaneously.},
keywords={},
doi={},
ISSN={},
month={March},}
부
TY - JOUR
TI - Development of a High-Tc SQUID-Based Magnetometer System for MCG Measurement
T2 - IEICE TRANSACTIONS on Electronics
SP - 670
EP - 676
AU - Shinya KURIKI
AU - Hiroshi OYAMA
AU - Amane HAYASHI
AU - Satoru HIRANO
AU - Tomoaki WASHIO
AU - Mizushi MATSUDA
AU - Koichi YOKOSAWA
PY - 2002
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E85-C
IS - 3
JA - IEICE TRANSACTIONS on Electronics
Y1 - March 2002
AB - We describe here development of a multichannel high-Tc SQUID magnetometer system for measurement of cardiac magnetic fields, aiming at future application of diagnosis of heart diseases. Two types of direct-coupled SQUID magnetometers were fabricated and used: single pickup coil magnetometer having flux dams to suppress the shielding current that would induce flux penetration and the consequent low-frequency noise, and double pickup coil magnetometer having no grain boundary junctions and flux dams on the pickup coil. The superconducting film of both the magnetometers had holes and slots, leaving 5 µm-wide strip lines, to suppress trapping and penetration of magnetic flux vortices in environmental fields. We studied different schemes of active shielding to reinforce the efficiency of field-attenuation of magnetically shielded room (MSR). A feedback-type compensation using a normal detection coil wound around the wall of MSR and a selective cancellation of 50 Hz noise by means of adaptive filter were developed. Such combination of passive and active shielding, based on the use of simple MSR, would be suitable in a practical low-cost magnetometer system for clinical MCG examination. We fabricated a liquid nitrogen cryostat that could contain up to 20 magnetometer-capsules at 4 cm separation in a flat bottom, with a distance of 16 mm between the air and liquid nitrogen. The cryostat was set in a gantry, which had rotational, vertical and horizontal freedoms of movement, in a moderate-shielding MSR that was combined with the developed active shielding. Measurements of MCG were performed for normal subject using eight magnetometers operating simultaneously.
ER -