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Illustration of the proxy model preparation. (a) CT scanning image. Select A Region Of Interest (ROI) with a size of 400 × 400 × 400 voxels. (b) Model of (selected ROI) after the image segmentation. (c) Model of (b) after removing the isolated pores and the pores on the edges from the image. A bilinear interpolation method was also performed to increase connectivity. (d) Final 3D image.