Preliminary results on brain monitoring of meningitis using 16 channels magnetic induction tomography measurement system

Abstract

Magnetic induction tomography (MIT) is a contactless measurement technique of biological tissue conductivity. In this study, the differential induced voltage equations are shown in single layer and n layers models. The paper describes a 16 channels MIT measurement system with working frequency of 1 MHz, which can image the plan of low conductivity object. According to physical experiments, the sensitivity is about 0.29°/S · m-1, and the maximum shift of the phase noise is 0.08°. Some preliminary clinical experiments were done, including 2 cases of meningitis and 5 cases of brain normal patients. The comparison of all the measured values shows that all values are smaller than 1.7° in the brain normal cases, but the values of meningitis cases are more than 2°, higher than those of brain normal patients. Therefore, the MIT measurement system has great application prospect in dynamically monitoring the brain diseases.