Analysis of the Cardiac Magnetic Field Using Multichannel Superconducting Quantum Interference Device System

我们使用32通道超导量子干涉装置(SQUID)系统测量了用于诊断心脏病的心场的x和y分量。在筑波大学医院的磁屏蔽室同时记录患者的心磁图(MCG)和心电图(CG)。探测范围为175x175 mm，点在x-y平面上与胸部表面平行约10 mm。从数据中得到电流矢量图，它显示了二维矢量|Bx，y|=|Bx+by|的电流分布和等场图。对正常、右室负荷、左室负荷、缺血性心脏病、WPW综合征和胎儿进行了心电图和心电图的评估。除了大小、方向和极性外，时间和局部化也出现在二维电流矢量等场图上。

We measured the x and y components of the cardiac field for diagnosing heart disease using the 32-channel superconducting quantum interference device (SQUID) system. The patients' magnetocardiogram (MCG) and electrocardiogram (ECG) were simultaneously recorded in the magnetically shielded room at the University of Tsukuba Hospital. The detection area was 175*175 mm with 64 points on the x-y plane about 10 mm parallel to the surface of the chest. From the data, current vector maps were obtained, which showed the current distribution and isofield maps of two-dimensional vector |Bx, y|=|Bx+By|.MCG and ECG were evaluated in subjects as follows : normal, right ventricular overload, left ventricular overload, ischemic heart disease, WPW syndrome, and fetus.On MCG,the peak signal was observed just above the current source. In addition to magnitude, direction, and polarity, time and localization were also represented on the two-dimensional current vector isofield maps.