Create a short video to visualise a transform

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1

Hello,
I have a transform that I apply to an organ segmentation. It would be nice to have a short animation of the segmentation moving from its original position/orientation/shape to the final one to visualize the transform.

This would be very helpfull to communicate with healthcare professional and for outside communication in general.

Is there any module/script that could help me to do that ?

2

Yes, this would be nice. Not all transforms are easy to interpolate, but for something like a grid transform it’s doable. This could be added to the Animator module with some scripting.

3

Unfortunately, I have a B-spline transform.
Fortunately, I don’t have a computation time limit.
My first idea is to compute the destination position for each voxel and make them move linearly between the starting and ending position, taking a screenshot of the created segmentation at everystep and putting everything together as a video.
This would work with any transform.

4

Did you try just interpolating the coefficients of the b-spline control points?

5

I didn’t
I haven’t started coding this (and I don’t think I will soon)
I don’t know how to interpolate the coefficient of the b-spline control point (and I haven’t looked into it).
Also, I think it’s easier to code soething that works with every transform even if it’s more computationnally costly.

6

Actually, you should be able to do something quick with SetDisplaycementScale so very little coding required (at least for the bspine case).

I just did this with a bspline registration result

>>> 
>>> bs = getNode("BS*")
>>> t = bs.GetTransformFromParent()
>>> t.GetDisplacementScale()
1.0
>>> t.SetDisplacementScale(.5)
>>> t.SetDisplacementScale(.25)
>>> t.SetDisplacementScale(.75)