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中文摘要：
为电阻抗断层成像技术的实际应用选择一种较优的电流激励方法，本文研究了一种单电流源两电极对向激励方法。通过计算机仿真、物理模型实验和初步的动物实验，结合电阻抗成像的反投影算法，与传统的邻近电流激励的电阻抗成像进行比较研究，并分析图像质量、定位误差以及重构误差。结果表明，与邻近激励相比，基于对向激励方法的电阻抗成像的抗噪性能较好。因此在临床较强噪声环境下，对向激励方法更适合于电阻抗成像的实际应用。
英文摘要：
To choose a better current excitation method for electrical impedance tomography （EIT） in practical applications, polar excitation, a method of single current excitation with pairs of electrodes in opposite position, was studied. Combined with back-projection algorithm of EIT, a comparative study was made on the polar excitation and traditional adjacent excitation through computer simulation, phantom experiments and animal experiments. The image quality, location accuracy and reconstruction error were all analyzed and studied. Results show that the impedance imaging based on polar excitation has a good ability of anti-noise in comparison with that on adjacent excitation. Polar excitation, therefore, is more appropriate for practical applications of EIT in clinical noisy environment.
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Preliminary Simulations on Magnetic Induction Tomography of the Brain Based on Finite Element Method
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