The magnetic induction tomography measurement system based on Helmholtz coil

Abstract

Magnetic induction tomography (MIT) is a contactless measurement of biological tissue conductivity imaging technique. The spiral coil is widely used, which leads to the nonuniformity of sensitivity distribution of the detection signal. This paper proposed the Helmholtz coil which can generate a set of uniform excitation fields, and analyzed the uniformity of excitation field. In MIT system, the exciting magnetic field is generated through sine-wave current, with the frequency of 10MHz and exciting current of 20mA. The experimental physics model simulated cerebral hemorrhage is produced by using the distilled water, the agar powder and NaCl. The result experiments show that this system can test the changes of the conductivity of partial tissues, and reflect the position of the foreign matter, but the image is enlarged compared with the actual one.