# CT slices are not stacked on top of each other

**URL:** <https://discourse.slicer.org/t/ct-slices-are-not-stacked-on-top-of-each-other/2299>\
**Category:** Support\
**Created:** [March 12, 2018, 3:49pm UTC](https://discourse.slicer.org/t/ct-slices-are-not-stacked-on-top-of-each-other/2299 "2018-03-12T15:49:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ReNeu](https://avatars.discourse-cdn.com/v4/letter/r/e8c25b/32.png) [@ReNeu](https://discourse.slicer.org/u/ReNeu)\
**Post date:** [March 12, 2018, 3:49pm UTC](https://discourse.slicer.org/t/ct-slices-are-not-stacked-on-top-of-each-other/2299/1 "2018-03-12T15:49:57Z")

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Hi Andras,

Another problem that I have encountered while loading a file of CT images is that they don’t stack on top of each other. This does not occur when viewing the images outside Slicer. I’ve tried attaching screen shots.

 ![Unstacked%20CT%20slices](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/d/dd279b603d7a182bb913392be273a21639a0ca51.jpeg)  
 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/7/b7f273479e19d899c0ee08f0b3bb3d4845306604.png)

Cheers,

Ettie

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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:** [March 12, 2018, 3:56pm UTC](https://discourse.slicer.org/t/ct-slices-are-not-stacked-on-top-of-each-other/2299/2 "2018-03-12T15:56:07Z")

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By default Slicer shows standard axial, sagittal, coronal oriented slices. If your volume is not axis-aligned and the spacing between slices is very large then you may get staircase appearance.

For non-axis-aligned acquisitions, you may want to show the slices in their native orientation, by [using “Rotate to volume plane” function](https://discourse.slicer.org/t/mri-dwi-images-load-with-wrong-orientation/482/2?u=lassoan).

If you want to process a volume that has highly anisotropic spacing (e.g., 10x larger spacing between slices than spacing between pixels within a slice) and you want to process it (segment, register, etc.) then it is strongly recommended to crop&resample the volume to have isotropic spacing, using Crop volume module.