Budnyk M M, Voytovych I D, Minov Y D, Sutkovyi P G, Primin M A, Nedayvoda I V, Vasyliev V V
Glushkov Institute for Cybernetics, Kyiv, Ukraine.
Neurol Clin Neurophysiol. 2004 Nov 30;2004:112.
The purpose of this work was to develop a low-cost magnetocardiography (MCG) system for use at cardiology clinics, without any magnetic shielding. The device consists of seven channels: four signal and three reference channels. The signal channels are based on relaxation-oscillation SQUIDs. The reference channels are assembled into an orthogonal reference vector magnetometer (RVM). The 11-litre magnetotransparent helium cryostat allows operation for 5 days without refilling. With the 4-channel device, it is possible to perform measurements of magnetic maps in a standard 36-point grid so that only 9 spatial positions of the multichannel magnetometer are used; acquiring 30 s of data for each observation point takes about 10-15 minutes. Software was developed for the device adjustment, data acquisition, and data processing, including preliminary processing, MCG-mapping, and medical analysis. Digital filtering, adaptive noise compensation, and averaging are used to suppress magnetic noises. Cardiac sources were modelled with effective magnetic dipoles, and with estimated 2D current density distributions at a frontal plane.
这项工作的目的是开发一种用于心脏病诊所的低成本无磁屏蔽心磁图（MCG）系统。该设备由七个通道组成：四个信号通道和三个参考通道。信号通道基于弛豫振荡超导量子干涉器件（SQUIDs）。参考通道组装成一个正交参考矢量磁力计（RVM）。这个11升的磁透明氦低温恒温器允许在不重新填充的情况下运行5天。使用这个4通道设备，可以在标准的36点网格中进行磁图测量，这样只使用了多通道磁力计的9个空间位置；每个观测点采集30秒的数据大约需要10到15分钟。开发了用于设备调整、数据采集和数据处理的软件，包括预处理、MCG映射和医学分析。使用数字滤波、自适应噪声补偿和平均来抑制磁噪声。心脏源用有效磁偶极子以及额面的估计二维电流密度分布进行建模。
