Application of superconducting magnetometers to the measurement of the vector magnetocardiogram
Application of superconducting magnetometers to the measurement of the vector magnetocardiogram
复制标题
超导磁力计在矢量心磁图测量中的应用
DOI：
10.1109/tmag.1977.1059333
复制
发表时间：
1977
影响因子：
2.1
通讯作者：
W. Fairbank
中科院分区：
文献类型：
--
作者：
J. Wikswo;W. Fairbank
为了对人体心电向量图(VMCG)进行详细分析，研制了差示磁强计、钼磁屏蔽体和数字数据采集系统。利用该系统，VMCG可以记录在受试者胸部周围的任何想要的点，同时记录向量心电(VECG)。为了简化三维时变矢量磁场的分析，VMCG的空间变化可以用诸如磁多极系列的有效源产生的场来描述。我们发现正常受试者的VMCG场是足够偶极的，以至于仅用一个磁偶极子就可以描述VMCG的主要特征。偶极子场方程组的部分反演和数值分析技术被用来确定偶极子的分量和位置，从而提供了偶极子场与观测场的最小二乘拟合。
A differential magnetometer, a molypermalloy magnetic shield, and a digital data acquisition system have been developed for detailed analysis of the human vector magnetocardiogram (VMCG). With this system, the VMCG can be recorded at any desired point around the subject's thorax while simultaneously recording the vector electrocardiogram (VECG). To simplify analysis of the three-dimensional time dependent vector magnetic field, the spatial variation of the VMCG can be described in terms of the field produced by an effective source such as a magnetic multipole series. We find the VMCG field from normal subjects to be sufficiently dipolar that a magnetic dipole alone can be used to describe the major features of the VMCG. A partial inversion of the dipole field equations and numerical analysis techniques are used to determine the components and location of the dipole that provides the least-squares fit of the dipole fields to the observed ones.