Mesh comparison for CT data

Using the open-source mesh comparison software, Cloud Compare, the isosurface of the micro-CT data was first registered to the target isosurface by rough manual registration. Then, automatic registration, based on the iterative closest point algorithm, was used to register the meshes closely. After registration was completed, the signed distance (SD) from the micro-CT point cloud to the target mesh was calculated. A Gaussian distribution was fit to the histogram of SD to measure the statistics of the SD error between printed object and the target geometry.