# Can’t cut away unwanted tissue

**URL:** <https://discourse.slicer.org/t/can-t-cut-away-unwanted-tissue/20417>\
**Category:** Support\
**Created:** [October 30, 2021, 2:26am UTC](https://discourse.slicer.org/t/can-t-cut-away-unwanted-tissue/20417 "2021-10-30T02:26:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mdear](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mdear/32/12261_2.png) [@mdear](https://discourse.slicer.org/u/mdear)\
**Post date:** [October 30, 2021, 2:26am UTC](https://discourse.slicer.org/t/can-t-cut-away-unwanted-tissue/20417/1 "2021-10-30T02:26:34Z")

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Newbie question.  
I pull in DICOM data, go to data module and drag the data series into the 3D window. I then go to the segmentation editor and select threshold tool and select all voxels. I then select the box to allow me to select on the 3D window. use cut tool to cut away unwanted portions. I see the cut away portions disappearing up on the three slice views but the voxels do not disappear from the 3D view. What am I missing here ? Those extra voxels are obstructing the view I want. Thanks.

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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:** [October 30, 2021, 3:26am UTC](https://discourse.slicer.org/t/can-t-cut-away-unwanted-tissue/20417/2 "2021-10-30T03:26:54Z")

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If you display the volume using volume rendering then you can use Mask volume effect to remove (blank out) parts of the volume that occlude your view:

[![](https://img.youtube.com/vi/xZwyW6SaoM4/maxresdefault.jpg "New "Surface cut" and "Mask volume" tools for 3D Slicer segment editor") ](https://www.youtube.com/watch?v=xZwyW6SaoM4)

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**Author:** ![mdear](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/mdear/32/12261_2.png) [@mdear](https://discourse.slicer.org/u/mdear)\
**Post date:** [October 30, 2021, 11:51pm UTC](https://discourse.slicer.org/t/can-t-cut-away-unwanted-tissue/20417/3 "2021-10-30T23:51:51Z")

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Fabulous, thanks! I’m getting better at this every day. Appreciate the pointer.