# About segmentation and three-dimensional reconstruction for CT

**URL:** <https://discourse.slicer.org/t/about-segmentation-and-three-dimensional-reconstruction-for-ct/23322>\
**Category:** Support\
**Tags:** dicom\
**Created:** [May 7, 2022, 1:43pm UTC](https://discourse.slicer.org/t/about-segmentation-and-three-dimensional-reconstruction-for-ct/23322 "2022-05-07T13:43:42Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zhiyuan](https://avatars.discourse-cdn.com/v4/letter/z/a87d85/32.png) [@zhiyuan](https://discourse.slicer.org/u/zhiyuan)\
**Post date:** [May 7, 2022, 1:43pm UTC](https://discourse.slicer.org/t/about-segmentation-and-three-dimensional-reconstruction-for-ct/23322/1 "2022-05-07T13:43:42Z")

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I have a question. CT images are scanned and photographed at a certain interval. For example, it is a plane scan at an interval of 1mm. When we segment, we can only segment the target area of the scanning surface. For the images with a vertical interval of 1mm that are not scanned, what is the basis for interpolation and filling?

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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:** [May 9, 2022, 4:42am UTC](https://discourse.slicer.org/t/about-segmentation-and-three-dimensional-reconstruction-for-ct/23322/2 "2022-05-09T04:42:58Z")

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I’m not exactly sure what you are asking. Could you add a drawing to make things more clear? Mark the “target area of the scanning surface”, and the “interpolation and filling” you are interested in. Thank you!