# Inverse ROI volume crop

**URL:** https://discourse.slicer.org/t/inverse-roi-volume-crop/44032
**Category:** Support
**Created:** [August 9, 2025, 9:17am UTC](https://discourse.slicer.org/t/inverse-roi-volume-crop/44032 "2025-08-09T09:17:08Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![JaredAmudeo](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jaredamudeo/32/77474_2.png) [@JaredAmudeo](https://discourse.slicer.org/u/JaredAmudeo)
#### Post date: [August 9, 2025, 9:17am UTC](https://discourse.slicer.org/t/inverse-roi-volume-crop/44032/1 "2025-08-09T09:17:08Z")

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Hi! Is there a simple way to do a volume crop that selects everything outside the ROI, basically erasing everything inside?

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### Author: ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)
#### Post date: [August 9, 2025, 4:39pm UTC](https://discourse.slicer.org/t/inverse-roi-volume-crop/44032/2 "2025-08-09T16:39:44Z")

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Not through crop volume because it is not meaningul to have a void in a 3d volume. But you can accomplish setting those voxels to background value (e.g 0) through segmentation, specifically MaskVolume effect.