# How can I quantify the difference between two similar models after superimposing the two models?

**URL:** <https://discourse.slicer.org/t/how-can-i-quantify-the-difference-between-two-similar-models-after-superimposing-the-two-models/489>\
**Category:** Support\
**Created:** [June 13, 2017, 2:36am UTC](https://discourse.slicer.org/t/how-can-i-quantify-the-difference-between-two-similar-models-after-superimposing-the-two-models/489 "2017-06-13T02:36:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ramttoong](https://avatars.discourse-cdn.com/v4/letter/r/edb3f5/32.png) [@Ramttoong](https://discourse.slicer.org/u/Ramttoong)\
**Post date:** [June 13, 2017, 2:36am UTC](https://discourse.slicer.org/t/how-can-i-quantify-the-difference-between-two-similar-models-after-superimposing-the-two-models/489/1 "2017-06-13T02:36:01Z")

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How can I quantify the difference between two similar models after superimposing the two models?

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [June 13, 2017, 12:04pm UTC](https://discourse.slicer.org/t/how-can-i-quantify-the-difference-between-two-similar-models-after-superimposing-the-two-models/489/2 "2017-06-13T12:04:08Z")

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- For qualitative assessment (surface color coded by closest distance): install Model to model distance extension, use Model to model distance module.
- For quantitative assessment (95th percentile of Hausdorff distance, Dice): install SlicerRT extensions, using Segmentations module import your models into a segmentation node, use Sement comparison module to compute metrics.