基于电阻抗断层成像的非均匀电导率颅骨物理模型研究

A Study on Inhomogeneous Skull Phantoms Based on Electrical Impedance Tomography

目的用非均匀电导率分布的颅骨模型进行电阻抗断层成像(EIT)实验,分析颅骨电导率非均匀分布对成像结果的影响。方法选用石膏材料制作非均匀电导率的颅骨模型,用此模型模拟头颅进行EIT目标成像,并将结果与均匀电导率颅骨模型的成像结果进行比较。结果相对于均匀电导率模型,在非均匀电导率模型内成像目标更加远离电导率较低一侧,且所在位置边界电压扰动量降低。结论颅骨模型的电导率非均匀分布对成像定位有明显影响,需要在成像算法上做进一步改进。

Objective To investigate skull phantoms with inhomogeneous distribution of conductivity based on Electrical impedance tomography（EIT） and to analyze the effect of inhomogeneous distribution of conductivity. Methods A model of skull with inhomogeneous distribution of conductivity was established and EIT experiment was made basing on this model,then the results obtained from this model and homogeneous skull were compared. Results As compared with the homogeneous skull model,the target in the inhomogeneous model is farther from the place where the conductivity and the variational value are lower. Conclusion The inhomogeneous distribution of conductivity in the skull model has significant influence on the orientation of the image,and the image reconstruction algorithm should be improved.