# How to calculate %overlap of 2 segmentation objects

**URL:** <https://discourse.slicer.org/t/how-to-calculate-overlap-of-2-segmentation-objects/25112>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [September 6, 2022, 12:22am UTC](https://discourse.slicer.org/t/how-to-calculate-overlap-of-2-segmentation-objects/25112 "2022-09-06T00:22:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![n3ubie](https://avatars.discourse-cdn.com/v4/letter/n/f08c70/32.png) [@n3ubie](https://discourse.slicer.org/u/n3ubie)\
**Post date:** [September 6, 2022, 12:22am UTC](https://discourse.slicer.org/t/how-to-calculate-overlap-of-2-segmentation-objects/25112/1 "2022-09-06T00:22:54Z")

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Hi! I am new to Slicer, and am trying to do segmentation of objects in MRI head. I would like to compare the overlap of 2 manual segmentation objects, how should I go about in doing it in the segmentation statistics?

Also would you recommend working with dicom or nii for best result?

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**Author:** ![cpinter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/cpinter/32/7995_2.png) [@cpinter](https://discourse.slicer.org/u/cpinter)\
**Post date:** [September 6, 2022, 12:27pm UTC](https://discourse.slicer.org/t/how-to-calculate-overlap-of-2-segmentation-objects/25112/2 "2022-09-06T12:27:06Z")

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You can use the Logical operators tool in the Segment Editor module then get the volume in Segment Statistics.

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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:** [September 6, 2022, 2:01pm UTC](https://discourse.slicer.org/t/how-to-calculate-overlap-of-2-segmentation-objects/25112/3 "2022-09-06T14:01:59Z")

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You can also find some segment comparison metrics in Segment Comparison module (provided by SlicerRT extension).