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
Kami menerangkan di sini pembangunan saluran tinggi berbilangTc Sistem magnetometer SQUID untuk pengukuran medan magnet jantung, bertujuan untuk aplikasi masa depan diagnosis penyakit jantung. Dua jenis magnetometer SQUID gandingan langsung telah direka dan digunakan: magnetometer gegelung pikap tunggal yang mempunyai empangan fluks untuk menekan arus pelindung yang akan mendorong penembusan fluks dan bunyi frekuensi rendah akibatnya, dan magnetometer gegelung pikap berganda yang tidak mempunyai persimpangan sempadan butiran dan fluks. empangan pada gegelung pikap. Filem superkonduktor kedua-dua magnetometer mempunyai lubang dan slot, meninggalkan garis jalur lebar 5 µm, untuk menyekat perangkap dan penembusan vorteks fluks magnet dalam medan persekitaran. Kami mengkaji skema perisai aktif yang berbeza untuk mengukuhkan kecekapan pengecilan medan bilik terlindung magnetik (MSR). Pampasan jenis maklum balas menggunakan gegelung pengesan biasa yang dililit di sekeliling dinding MSR dan pembatalan selektif hingar 50 Hz melalui penapis penyesuaian telah dibangunkan. Gabungan perisai pasif dan aktif sedemikian, berdasarkan penggunaan MSR ringkas, akan sesuai dalam sistem magnetometer kos rendah yang praktikal untuk pemeriksaan MCG klinikal. Kami membuat kriostat nitrogen cecair yang boleh mengandungi sehingga 20 kapsul magnetometer pada pemisahan 4 cm di bahagian bawah rata, dengan jarak 16 mm antara udara dan nitrogen cecair. Kriostat ditetapkan dalam gantri, yang mempunyai kebebasan pergerakan berputar, menegak dan mendatar, dalam MSR perisai sederhana yang digabungkan dengan perisai aktif yang dibangunkan. Pengukuran MCG telah dilakukan untuk subjek normal menggunakan lapan magnetometer yang beroperasi serentak.
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Salinan
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
Salinan
@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},}
Salinan
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 -