Research On Critical Problems Of Proximity Detection Of Intracranial Dielectric Object

In recent years,proximity detection of intracranial dielectric object,is a hot research topic in the field of biological electromagnetism,also a difficult problem.On the one hand,development of proximity detection's technology of intracranial dielectric object,is of important theoretical significance and application value for intracranial disease diagnosis,hold on great attention by many scholars both domestic and abroad in recent years.On the other hand,intracranial tissues,often with nonlinear,multi-scale,multi-dimensional,and medium's dispersion characteristics,makes the electromagnetic scattering characteristics of the dielectric object facing many difficulties such as effective acquisition,large amount of calculation.According to the problems above,based on the analysis of equivalent transmission line model of intracranial structure,this paper studies the frequency varying characteristics of electromagnetic properties of intracranial tissues,verify suitable microwave frequency for the enhanced detection.In order to realize effective computing of complex intracranial tissues' electromagnetic scattering characteristics,a kind of spherical layered model approximating real anatomy structure is put forward.Based on spherical hierarchical structure,this paper analyzes the electromagnetic field distribution's regulation of intracranial structure and electromagnetic scattering field distribution's regulation of dielectric object.After understanding of electromagnetic field distribution of intracranial structure,a novel antenna array which is sensitive to capture the scattering field information is designed,and the electromagnetic interaction between the abnormal object and the excitation source is studied further.In order to achieve the effective diagnosis of intracranial structure for abnormal object,this paper studies confocal imaging algorithm for proximity detection of intracranial structure,analyzes the practical problems in head imaging by confocal imaging algorithm.Based on the electromagnetic interaction mechanism between the source and intracranial structure,an imaging scheme with directional beam is proposed,and we deeply analyze the microwave confocal imaging results of intracranial dielectric object by employing the Gaussian beam,Laguerre-gaussian beam and EM-dipole,so as to realize the effective diagnosis of abnormal object in head.