![]() ![]() Being developed for a magnetic resolution with an order of magnitude in the tens of pT (10-11T), which is close to the SQUID domain.Compact and biomagnetic sensors using MR elements with spintronics technology.Design features of the prototype MR biomagnetic sensors from TDK As a result, it is expected to have applications not only in the field of medical diagnosis such as magnetocardiography, but also in the fields of health care and sports science. It is also designed to be compact and to provide excellent operability and portability. Unlike the SQUID flux meter, which is an expensive and bulky system that also requires a cooling device using liquid helium (Dewar), this prototype system, which uses MR sensors, is being developed for measurement with high sensitivity even at room temperature. And, through collaborative research with the graduate school of the Tokyo Medical and Dental University, TDK has developed a prototype biomagnetic measurement system using a multi-channel sensor array, and we are the first in the world to successfully carry out proof-of-concept measurement and visualization (imaging) of the cardiac magnetic fields using MR sensors. These prototype sensors are designed to make it possible to sense weak biomagnetic fields which currently can only be measured by using a SQUID (Superconducting Quantum Interference Device) flux meter. TDK has developed compact prototype biomagnetic sensors through development of applications with MR (magnetoresistive) element technology utilizing spintronics technology that was cultivated through the manufacture of HDD (hard disc drive) heads. This technology is being developed to open up the possibility of finding solutions to problems, such as the existence of heart disease in an unborn infant, which cannot be discovered using an existing electrocardiograph, or ischemic heart disease which is difficult to detect at an early stage. One of these is a prototype magnetic sensor designed to measure very weak biomagnetic fields. ![]() We are focused on development of a wide variety of sensors for various applications. Our results will contribute to the development of low-cost devices for recording MCGs, which will help develop non-invasive diagnostics in cardiovascular medicine.Sensors are one of TDK’s key technologies. The cardiac magnetic field corresponding to P, QRS, and T waves on an electrocardiogram (ECG) was detectable by signals averaging 272 ± 27.5 beats.Īn MR sensor array can be used to measure cardiac magnetic fields. A 30-channel MR sensor array was placed in a magnetically shielded room, and the cardiac magnetic field over the anterior chest walls of five healthy subjects was recorded.įor all five subjects, MCGs were successfully recorded using the MR sensor array. We used an MR sensor array, which was developed for measuring magnetic fields in the picotesla range, with a reduced noise level (TDK Corporation, Tokyo, Japan). This study was aimed to evaluate feasibility of the MR sensor array for acquiring MCGs. In contrast, magnetoresistive (MR) magnetometers function by detecting the change in resistance, caused by an external magnetic field, and have much lower costs. SQUID is the most sensitive instrument for measuring low-frequency magnetic fields, but it requires liquid helium for cooling, so operating costs are high. In previous magnetocardiography studies, magnetocardiograms (MCGs) have been obtained using superconducting quantum interference device (SQUID) systems. ![]()
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