心磁界計測の原理と歴史おょび計測方法

摘要

Biomagnetic measurement was performed for the first time in the 1960s, and various studies have been carried out along with the development and high performance of SQUID (superconducting quantum interference devices) magnetometers. Recently, clinical applications of magnetocardiograms (MCGs) have been widely studied. MCGs are useful such as for diagnosing the conduction process and evaluating ischemic heart disease. In this paper, I explain the basics of MCG measurement about the mechanism of generation of magnetic field from a heart, history of MCG measurements, measurement device, high sensitivity magnetic sensor and example of actual MCG measurements. Currently, inexpensive MCG measurement devices operating at room temperature have been developed. Although the noise level is still large compared to the SQUID magnetometer, it has advanced to a level at which MCG can be measured. In the near future, it is expected that the sensitivity will further advance, and MCG measurement will be enlargement.