基于电阻抗成像的均质头模型研究

Study on Homogeneous Head Phantoms Based on Electrical Impedance Tomography

目的评估低电导率的颅骨对人脑阻抗成像的影响。方法基于适用于头部的优化的硬件系统和反投影算法,在建立的一个圆筒形和一个半球形的包含“颅骨”的均质头模型上,对多种扰动目标进行成像研究。结果现有系统对含均质“颇骨”的头部物理模型内电导率、位置和尺寸不同的简单扰动目标成功地进行了图像重建。结论“颅骨”的存在对重构图像产生了显著的影响,揭示了脑电阻抗图像监护的可行性,为动物实验提供了依据。

Objective To evaluate how skull exert influence on brain electrical impedance tomography （EIT）. Methods Based on an optimized hardware system and back-projection algorithm, data of various configurations of perturbations were collected from both a cylindrical and a hemispherical head phantom were constructed. Results Images were reconstructed successfully with current system for perturbations of different conductivities,sizes or positions in the homogeneous head phantoms. Conclusion Significant influences on image quality are found with the presence of the ＂skull＂. The feasibility of electrical impedance monitoring of human brain is suggested and the possibility of the experiment on animals is proved.