Multi-Channel Magnetocardiogardiography System Based on Low-Tc SQUIDs in an Unshielded Environment
Multi-Channel Magnetocardiogardiography System Based on Low-Tc SQUIDs in an Unshielded Environment
复制标题
非屏蔽环境下基于 Low-Tc SQUID 的多通道心磁图系统
DOI：
10.1016/j.phpro.2012.06.161
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Xiaoming Xie
中科院分区：
文献类型：
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作者：
X. Kong;Shulin Zhang;Yongliang Wang;J. Zeng;Xiaoming Xie
使用超导量子干涉装置 (SQUID) 的心磁图 (MCG) 是一种新型医疗诊断工具，可测量人类心脏电活动产生的生物磁信号。该技术完全被动、非接触，在心脏病的早期诊断方面具有优势。我们开发了国内首个基于低温直流SQUID的非屏蔽四通道MCG系统。没有使用昂贵的磁屏蔽室，而是通过使用二阶梯度计和三轴参考磁力计实现了环境噪声抑制。系统测量磁场分辨率优于1 pT，可直接记录多周期人体心脏信号。另外，配合红外定位系统，移动无磁床9次即可实现48点数据采集。
Magnetocardiography (MCG) using superconducting quantum interference devices (SQUIDs) is a new medical diagnostic tool measuring biomagnetic signals that are generated by the electrical activity of the human heart. This technique is completely passive, contactless, and it has an advantage in the early diagnosis of heart diseases. We developed the first unshielded four-channel MCG system based on low-Tc DC SQUIDs in China. Instead of using a costly magnetically shielded room, the environmental noise suppression was realized by using second-order gradiometers and three-axis reference magnetometer. The measured magnetic field resolution of the system is better than 1 pT, and multi-cycle human heart signals can be recorded directly. Also, with the infrared positioning system, 48 points data collection can be realized by moving the non-magnetic bed nine times.