| Magnetic induction tomography imaging technology(MIT) is a new kind of noninvasive imaging technology. This technology with alternating magnetic field as its excitation source,can penetrate the skull. This technology can realize real-time monitoring for the patients,because the detection method it used is non-contact measurement methods, which can avoid or mitigate the pain of patients. Therefore, the MIT technology has obvious advantages in the detection of cerebral disease.MIT simulation technology can well simulate the real situation of human head. It can easily transform lesions state. It was helpful to study the signal detection caused by pathological changes, and it provides convenience for the simulation calculation of the craniocerebral MIT system. A four layers complex ball model was build in this article. And different lesions state of this model was simulated and analyzed.First of all, according to the anatomical structure of human head, build a four layer craniocerebral model. In this study, a fours layer of complex ball craniocerebral model was established, through the geometric modeling tools that Comsol Multiphysics software provides,according to the average size of normal human skull and brain. The model contains the skin layer, the skull layer, the cerebral spinal layer and the parenchymal layer. Then, through the comparison of the craniocerebral model, the ball model and the real head model, illustrates the advantages of this model, the superiority of the craniocerebral model was proved. Finally, the craniocerebral model was simulated, and the intracranial magnetic inductive intensity distribution was calculated. And then the cerebral lesions model was simulated. And we have respectively analyzed the influences that the different cerebral lesions interference bring to the magnetic induction intensity distribution, with electrical conductivity, location or volume changes of the cerebral lesion. Through rotating scanning experiment, we have analyzed the influence that the relative position changes bring to the magnetic induction intensity distribution.The results show that the craniocerebral simulation model in this paper can simulate the brain detection, and can well show the Magnetic properties difference of human head tissues.This model provides a reliable data reference for MIT system research, and has importantimplications to the further application of MIT in craniocerebral detection. |
