基于非均匀颅骨头模型的电阻抗断层成像图像重构

Image Reconstruction Based on an Inhomogeneous Skull Model for Electrical Impedance Tomography

目的研究非均匀颅骨对脑部电阻抗断层成像(EIT)的影响,以提高重构图像的质量。方法提出一种基于非均匀颅骨头模型的二维动态EIT成像算法,对脑出血病灶进行成像,并依据本文提出的图像质量评价指标,将重构结果与采用均匀圆头模型和4层同心圆头模型的脑出血成像结果进行了比较。结果采用非均匀颅骨头模型时,重构图像的相关性与目标定位准确性均有明显提高。结论结合颅骨非均匀性进行图像重构是一种有效的提高脑部EIT成像质量的方法。

Objective To study the effects of the inhomogeneous skull on electrical impedance tomography （EIT） of human brain in order to improve the quality of reconstructed image. Methods A two-dimensional （2-D） dynamic EIT algorithm based on the inhomogeneous skull model （ISM） was suggested and applied to reconstruct image of cerebral hemorrhage. According to the evaluating criteria of the image quality suggested in this paper, the reconstructed image was compared with those based on the homogeneous circle model （HCM） and the four-concentric circle model （FCCM）. Results Both the correlation and the localization accuracy of the reconstructed image were improved significantly when ISM was used. Conclusion To incorporate the skull inhomogeneity into image reconstruction is an effective way to improve the image quality of brain EIT.