# URGENT : Converting 2D ROI to 3D VOI

**URL:** <https://discourse.slicer.org/t/urgent-converting-2d-roi-to-3d-voi/35270>\
**Category:** Development\
**Tags:** build, segmentation, python, 3d-model\
**Created:** [April 4, 2024, 4:30am UTC](https://discourse.slicer.org/t/urgent-converting-2d-roi-to-3d-voi/35270 "2024-04-04T04:30:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Poorvica\_Ramanand](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/poorvica_ramanand/32/69675_2.png) [@Poorvica\_Ramanand](https://discourse.slicer.org/u/Poorvica_Ramanand)\
**Post date:** [April 4, 2024, 4:30am UTC](https://discourse.slicer.org/t/urgent-converting-2d-roi-to-3d-voi/35270/1 "2024-04-04T04:30:53Z")

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We are creating an automated surgical planning system. We have 2D ROIs slice wise. We want to stitch it together to find a possible trajectory in 3D space. Can someone give any inputs/solutions regarding this?

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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:** [April 6, 2024, 4:19am UTC](https://discourse.slicer.org/t/urgent-converting-2d-roi-to-3d-voi/35270/2 "2024-04-06T04:19:20Z")

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Slicer does everything in 3D. If you segment 2D slices then Slicer displays them in correct physical position in 3D.

How those ROIs are created?