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| Establishment of a Four Layer Complicated Ellipsoid Brain Model |
1 School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
2 School of SinoDutch Biomedical & Information Engineering, Northeastern University, Shenyang 110819, China
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Abstract The study of brain model establishment is the basis of intracranial imaging, and it is also the necessary condition for the calculation of forward problem solution in the magnetic induction tomography (MIT) system. According to the brain structure, a four layers complicated ellipsoid brain model was established through a finite element simulation software Comsol Multiphysics. Firstly, the brain parenchyma model was constructed according to the brain volume and the skull inner diameter. Secondly, the skull model was constructed according to the human anatomy structureand the contour, occipital, frontal and orbit of the model were corrected. Thirdly, the head cortex, skull and spinal fluid layer were constituted by scale model of the skull, and the four layers brain model were constituted together with the brain parenchyma layer. Finally, put the model into alternating current magnetic field of 10 MHz, and gave the induced current distribution of scalp layer, skull layer, spinal fluid layer and parenchymal layer. The induced current was strongest in the spinal fluid layer and weaker in the skin layer and the parenchymal layer, while was the weakest in the skull layer. The ratio of the induced current density values in each layer was 32:1:190:21, closed to the ratio of electrical conductivity. The simulation experimental results showed that the model could display the difference of the electromagnetic characteristics of human head tissues, providing reliable data for MIT system.
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