Muscle Magnetic Signal Measurement Using High Sensitive Superconducting Sensor

At present, the electromyography (EMG) method used to detect some muscle diseases is blind and random. And it has certain harm to the patients. Therefore, it is very important to develop an efficient and non-invasive method. First-order axial gradiometer based on SQUID is used to detect magnetic signal in muscles. The magnetic noise of the gradiometer is 3.5 fT/√Hz, and its sensitivity fully meet the demands of muscle magnetic detection. We measured the muscle's magnetic field under different intensities of stimulation, as well as the magnetic field generated by the muscle's spontaneous contraction. This is the first try to measure the muscle magnetic signal in China. The results are of great significance for the clinical application of muscle magnetic detection.