Study of MIT Phase Sensitivity for Detecting a Brain Edema Based on FDTD Method

摘要

To obtain design criteria of a MIT system and features of MIT measurements the study of the simulation method for a MIT experiment system, the performance investigation of a single channel MIT measurement for detecting a brain edema and the calculation of the phase parameter were developed based on the FDTD method, the approximation of a helix antenna and a MIT measurement model. The measurement model consisted of a excitation coil, a detection coil, a three layers spherical model of a head and a spherical model of a brain edema. The current phase deviations of a detection coil were estimated as the space location, the size and the conductivity of a brain edema were changed. The influence of an edem upon the current phase deviation is greater when the edema is not on the same plane as the excitation and detection coils based on simulation results. The resolution of the phase deviation change should reach 0.01 degree if an edema with 30mm radius needs to be detected when the edema is on the same plane as the excitation and detection coils.