# Some regions of loaded CT data are not showing in 3d slicer

**URL:** <https://discourse.slicer.org/t/some-regions-of-loaded-ct-data-are-not-showing-in-3d-slicer/20084>\
**Category:** Support\
**Created:** [October 9, 2021, 4:41pm UTC](https://discourse.slicer.org/t/some-regions-of-loaded-ct-data-are-not-showing-in-3d-slicer/20084 "2021-10-09T16:41:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Sliceeeeee](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/sliceeeeee/32/12358_2.png) [@Sliceeeeee](https://discourse.slicer.org/u/Sliceeeeee)\
**Post date:** [October 9, 2021, 4:41pm UTC](https://discourse.slicer.org/t/some-regions-of-loaded-ct-data-are-not-showing-in-3d-slicer/20084/1 "2021-10-09T16:41:39Z")

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When I am loading the data into 3d slicer some of its regions are not showing , but somehow when I am changing the master volume that regions are showing but I am not able to paint(Or edit them ) . Please help me in 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:** [October 9, 2021, 7:44pm UTC](https://discourse.slicer.org/t/some-regions-of-loaded-ct-data-are-not-showing-in-3d-slicer/20084/2 "2021-10-09T19:44:34Z")

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Extent of the segmentation is specified by the master volume that you selected first. See instructions for changing it [here](https://slicer.readthedocs.io/en/latest/user_guide/modules/segmenteditor.html#cannot-paint-outside-some-boundaries).

To show a volume in a slice view in full, you can click the [reset field of view button](https://slicer.readthedocs.io/en/latest/user_guide/user_interface.html#slice-view). If you switch to a recent Slicer Preview Release then clicking the eye icon in Data module will show the entire volume by default (no need to click the reset field of view button).