| Magnetic induction tomography（MIT）is a new noninvasive imaging technique,which by measuring and imaging bio-impedance. MIT has two characteristics: One is thatit is excited by magnetic field, that can penetrate skull easily; the other one is that itsimaging method has strong center sensitivity in imaging region, because of the twocharacteristics; MIT has an obvious advantage on diagnosing and monitoring cerebraldisease, especially for the brain hematoma and cerebral edema clinical real-timemonitoring.This paper based on the anatomical structure of brain and cerebral, and MIT theory,built the three-dimensional real head model, and the real head model was used formagnetic induction tomography system simulation. Some simulation study of MIT hadbeen done on detecting cerebral disease.Firstly, based on magnetic induction tomography theory, modeled cylindrical MITsystem, simulated and calculated using finite method, then analyzed how the parameters ofexciting coil and detected conductor influence on3-D MIT system, also suggest theexciting coil designed parameters of brain model for next simulation. Secondly, stated thestructure of brain in detail, reconstructed two layer real brain model from1026X-CTpictures. Thirdly, built brain MIT model, using complex finite element meshing, calculatedthe magnetic field distribution inside the brain with disease and without diseaserespectively. Finally, simulated cerebral hematoma, analysis on the relationship betweenexciting frequency, hematoma volume, density, location and magnetic field in detail, andcompared with the results of cylindrical system, studied the MIT detection performance indetecting cerebral disease.The results show that the simulation model in this paper can simulate the brainmeasuring situations, and the MIT has the ability to penetrate skull, so it can detect brain disease. This work has important significance for the MIT system design and the actualclinical cerebral disease detection in the future. |
PDF Full Text Request