A simplified superconducting quantum interference device system to analyze vector components of a cardiac magnetic field
A simplified superconducting quantum interference device system to analyze vector components of a cardiac magnetic field
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用于分析心脏磁场矢量分量的简化超导量子干涉装置系统
DOI：
10.1109/iembs.1998.745962
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
K. Teshigawara
中科院分区：
文献类型：
--
作者：
K. Tsukada;A. Kandori;T. Miyashita;H. Sasabuti;Hiroyuki Suzuki;Shoji Kondo;Y. Komiyama;K. Teshigawara
我们研制了一种通道超导量子干涉(SQUID)系统，它可以分析心脏磁场的矢量分量，而且比现有系统更紧凑，需要更少的SQUID传感器和测量电路。为了调整杜瓦的位置，包括传感器阵列和液氦相对于胸部的位置，床能够进行三维运动。使用个人计算机存储和分析来自经络的心磁图数据。每个测量部位都有一级梯度计，用于检测躯干上的BZ分量。在磁屏蔽室(MSR)中，系统的典型噪声小于20FT//SPL Radic/Hz。每个测量点的切向分量可以从x方向和y方向上的bz的一阶梯度计算出来。同时得到了Bz分量和Bxy切向分量两种类型的磁场分布。电流源在心脏中的位置和分布可以通过使用分析的切向磁场的二维投影来可视化。
We have developed a 64-channnel superconducting quantum interference (SQUID) system that can analyze the vector components of a cardiac magnetic field, and that is more compact and requires fewer SQUID sensors and measuring circuits than existing systems. To adjust the position of the dewar, containing sensor array and liquid He relative to the chest, the bed is capable of three-dimensional movement. The magneto-cardiogram (MCG) data from the 64 channels are stored and analyzed using a personal computer. Each measurement site contains first-order gradiometers to detect the Bz component on the torso. The typical noise of the system in a magnetically shielded room (MSR) is less than 20 fT//spl radic/Hz. Tangential components at each measuring site can be calculated from the first-order gradient of Bz in the x- and y-directions. Two types of magnetic-field patterns of the Bz component and the Bxy tangential components are obtained at the same time. The position and distribution of a current source in the heart can be visualized through a two-dimensional projection using the analyzed tangential magnetic field.