Open-type magnetocardiograph with cylindrical magnetic shield
Open-type magnetocardiograph with cylindrical magnetic shield
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DOI：
10.1063/1.1946203
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发表时间：
2005-06-13
影响因子：
4
通讯作者：
Ohnuma, M
中科院分区：
文献类型：
--
作者：
Seki, Y;Kandori, A;Ohnuma, M
我们开发了一种基于低转变温度（T-c）超导量子干涉器件（SQUID）的开放式心磁图仪（MCG），该心磁图仪具有圆柱形磁屏蔽（具有辅助磁屏蔽）和64个梯度计。磁屏蔽上应用旋转门，目的是方便接近对象并易于操作。连接到 MCG 的低温恒温器包含 64 个低 T-c SQUID，高度约为 1 m，因此磁屏蔽的圆柱形表面必须有一个开口。使用有限元方法模拟和实验来模拟磁屏蔽的特性。模拟结果表明，辅助磁屏蔽充分恢复了具有开口的磁屏蔽的屏蔽性能，其表现与没有开口的磁屏蔽一样。所开发的磁屏蔽的屏蔽系数在磁屏蔽附近达到46 dB以上。因此，开放型MCG可以清楚地测量心磁图。 (c) 2005 年美国物理研究所。
We have developed an open-type magnetocardiograph (MCG) with a cylindrical magnetic shield-having an auxiliary magnetic shield-and 64 gradiometers based on low-transition temperature (T-c) superconducting quantum interference devices (SQUIDs). A revolving door is applied to the magnetic shield with the aim of providing easy access to a subject and easy operation. The cryostat attached to the MCG contains 64 low-T-c SQUIDs and is about 1 m in height, so there must be an opening through the cylindrical surface of the magnetic shield. The properties of the magnetic shield were simulated using finite-element-method simulations and experiments. The results of the simulations indicated that the auxiliary magnetic shield recovers enough of the shielding performance of a magnetic shield with an opening that it performs like a magnetic shield without an opening. The shielding factor of the developed magnetic shield is above 46 dB in the vicinity of the magnetic shield. Accordingly, the open-type MCG can clearly measure magnetocardiograms. (c) 2005 American Institute of Physics.