CT scan gives us the cross sections of any body from top to bottom. We can set the no. of cross sections for a required body. Each and every cross section contains set of points which makes it a loop (normally). This is what required for a 3D modelling machine, I mean, cross sectional data.
This is not the exact answer, however, just to give an idea.
Our software below can load CT scans and make 3D images. The software also provides tools for slicing through the CT scan, extracting surfaces, exporting, and collecting 3D landmark points for shape analysis.