# Heat map two timepoint cbct comparison

**URL:** <https://discourse.slicer.org/t/heat-map-two-timepoint-cbct-comparison/42289>\
**Category:** Support\
**Created:** [March 25, 2025, 12:40pm UTC](https://discourse.slicer.org/t/heat-map-two-timepoint-cbct-comparison/42289 "2025-03-25T12:40:47Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Michelle\_cbo](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/michelle_cbo/32/79807_2.png) [@Michelle\_cbo](https://discourse.slicer.org/u/Michelle_cbo)\
**Post date:** [March 25, 2025, 12:40pm UTC](https://discourse.slicer.org/t/heat-map-two-timepoint-cbct-comparison/42289/1 "2025-03-25T12:40:47Z")

</div>

Hello, I am interested in generating a heat map to visualize changes in certain structures (preoperation and postoperation) using registered cbct files (nii.gz).

I tried model to model distance extension but it didn’t work, converting nii.gz to .vtk through slicer didn’t work either. I also have the files with the corresponding landmarks for both timepoints.