# Irregular shaped ROI and conversion to mask

**URL:** <https://discourse.slicer.org/t/irregular-shaped-roi-and-conversion-to-mask/12782>\
**Category:** Development\
**Created:** [July 30, 2020, 12:10am UTC](https://discourse.slicer.org/t/irregular-shaped-roi-and-conversion-to-mask/12782 "2020-07-30T00:10:02Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [March 2, 2021, 12:40pm UTC](https://discourse.slicer.org/t/irregular-shaped-roi-and-conversion-to-mask/12782/11 "2021-03-02T12:40:10Z")

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You should be able to use the Mask Volume effect for that:

> [@New segment editor effects: Mask volume and Surface cut](https://discourse.slicer.org/t/new-segment-editor-effects-mask-volume-and-surface-cut/699):
>
> See short demo video of the new “Mask volume” and “Surface cut” Segment editor effects here: These effects were developed by Kyle Macneil (Med-i Lab, Queen’s University; SPL, Brigham and Women’s Hospital), with help from @lassoan and @fedorov . Thank you for your contribution! Mask volume: Blanks out a segment or surrounding area in a volumetric image. Useful for quick removal of unwanted objects (such as CT table) or showing only a selected organ. It can also be used for creating a binary m…

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