Experiments measure magnetic field distribution from a nerve model using a needle type SV-GMR sensor, suggesting effective diagnostics for neurological diseases.
Measurements of magnetic fields from nervous cells can transpire to be significant in not only diagnostics but also treatment of neurological diseases. The sensor for nerve magnetic field measurements must be capable of detecting very low signals in order of Pico/Femto Tesla and the measurements must be as non-invasive as possible. For this purpose needle type spin valve giant magnetoresistance (SV-GMR) sensor was fabricated. Thin wire of 15 μm radius with supplied pulse wave was used as a model of the nerve. External magnetic field created by current pulses in the nerve model can be measured by touching the needle of the sensor to the model. The proposed sensor is much easier and better adjustable to surgical conditions than so far suggested measuring techniques utilizing super conducting quantum interference devices (SQUIDs). Experiments show that pulse signals as low as 1μA can be measured.
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岩原 et al. (2008) studied this question.
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