Hi, so I have two 3D CT images that I’d like to register. The first being the fixed image and the second the moving image, using elastix in 3D slicer. Is there a way to have elastix output the Jacobian of the image transform? or else how do I know what transformation function is utilized so I can code for the Jacobian matrix separately.

You can see the computed transformation matrix in Transforms module. However, Jacobian of a linear transform is not that exciting. What is your end goal?

If you want to compute strain for a warping transform then I would recommend to try ITKStrain on the displacement field vector image exported in Transforms module.

Maybe we should incorporate ITKStrain directly in Slicer? It could be helpful as a visualization mode for nonlinear transforms.