Elastix Registration 3D CT monomodal lung

Support
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1

Hello to all
I’ve been using the toolbox “registration” of 3d Slicer, especially “elastix”. Trying with a registration with “generic (all)” preset I get a discreet result, but not great. My goal is to get the best possible recording of the lungs.
(I am recording 2 CT scans of the same pig before ablation and after ablation, so in two distinct moments). I have questions

  1. What is the difference between the various “3D CT, monomodal lung” I have more than one and I do not understand the difference? (I’m always referring to the preset)
  2. Do you have any idea why it is not working? I get an error message. I’m using the same fixed and moving volume of “generic all”, but it doesn’t wok
    Thank you
2

Hello,

One thing that could work is to segment the lung and to register only the lung if that’s the region of interest in your use case

3

How do I do this? I created two segments, one for pre ablation lungs and one for post ablation lungs. I applied a rigid linear transformation, trying to make both images and volumes coincide as much as possible, but when I use the “elastix” toolbox and try to insert the mask, it is as if my segmentations did not exist.
Thank you

4

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This is the error that i find

5

Did you transform your segments into volume ?
I don’t know a way to do it directly, I usually first convert it to a labelmap then transform the labelmap to volume using the “mask scalar volume toolbox”.
Elastix only accept volume as input not segmentation, it might be why you couldn’t find them