基于轮廓形状的肺部电阻抗成像三维插值方法

肺部三维信息利于医生做出更快更准确的诊断,但肺部三维重建的图像都是源自二维断层图像的叠加.二维图像的数量制约三维成像的效果,增加电极层数可获取更多层的二维图像,但同时也会增加计算量,减缓成像速度.虽然采取层间插值的方法可以解决这个问题,但是由于人体几何结构的特异性,肺部电阻抗图像(electrical impedanc...

Three dimensional interpolation method of pulmonary electricalimpedance tomography based on contour shape

3D lung information can help doctors making faster and more accurate diagnosis. However, 3D lung reconstruction is derivedfrom stacking of two-dimensional tomographic images. The quantity of two-dimensional images restricts the quality of 3D reconstruction.Increasing the number of electrode layers could achieve more two-dimensional images. However, the calculation complexity is increasedand imaging speed is down. The inter-layer interpolation can solve this problem, however, the specificity and irregularity of human bodygeometry make electrical impedance tomography (EIT) lung images irregular. As a result, the traditional interpolation algorithm suitableonly for regular images which cannot be directly applied to EIT images. Thus, a three-dimensional interlayer interpolation algorithmsuitable for pulmonary electrical impedance is proposed. Firstly, the contour of the interpolated image is obtained, and then the pixelvalue is interpolated with the corresponding point. Simulation and experiment verify that the relative error of the new interpolationalgorithm is 5. 69%, 3. 3% lower than that of linear interpolation and spline interpolation respectively. The three-dimensionalinterpolation method based on contour shape can further improve the quality of three-dimensional electrical impedance imaging and betterreflect the real shape of the lung under the condition of limited measurement data.