基于三维真实颅脑模型的单次电流激励对EIT重构图像质量影响的研究  

Research on the effect of single current injection for EIT reconstructive imaging quality based on the three-dimensional real head model

作　　者：陈荣庆[1] 李昊庭 刘学超[1] 张戈[1] 徐灿华[1] 董秀珍[1] 付峰[1] LI Hao-ting;LIU Xue-chao(Department of Biomedical Engineering, The Fourth Military Medical University, Xi’an 710032, China)

机构地区：[1]第四军医大学生物医学工程系,陕西西安710032

出　　处：《中国医学装备》2017年第8期10-13,共4页China Medical Equipment

基　　金：国家自然科学基金(51477176)"一种基于电阻抗技术的超早期脑水肿检测新方法的研究基础";军队重大项目(AWS14C006)

摘　　要：目的:定量检测单次电流激励所携带的阻抗分布信息在电阻抗断层成像(EIT)重构过程中的权重,分析对EIT重构图像质量影响。方法:利用人颅脑CT建立三维真实颅脑模型进行仿真实验研究,通过图像评价指标定量对比各次电流激励对EIT重建图像质量造成的影响。结果:图像噪声及位置误差两项图像评价指标表明,每次电流激励所得数据在图像重构过程中所占权重并不一致,与目标轴线夹角在22.5°~45°的激励电极对所获得的数据是影响重构图像质量的关键。结论:在EIT重构过程中,对各次电流激励进行不同的权重处理,引入的噪声也一并会降低,有助于提高重构图像的质量。Objective:To quantitatively analyze the weight of the information of impedance distribution that were carried by single current injection in the reconstruction of electrical impedance tomography.Methods:Used head CT of human to establish three-dimensional real head model for experiment research of simulation,and the effects of every single current injection on EIT reconstructive image quality were compared through the evaluation indicators of image.Results:The two evaluation indicators of image revealed that the obtained data were the key that could influence quality of reconstructive image when the included angle of current injection with aim axis was between22.5°and45°.Conclusion:The weights of obtained data from single current injection were not unanimous in reconstruction of image,and the quantitatively research of weight has important value in improving the quality of reconstructive image of head EIT.

关 键 词：颅脑电阻抗成像 图像重建算法 单次电流激励 图像质量 三维颅脑模型 

分 类 号：R741.049[医药卫生—神经病学与精神病学]