# unexpected 3d volume generated

**URL:** https://discourse.slicer.org/t/unexpected-3d-volume-generated/22259
**Category:** Support
**Tags:** dicom
**Created:** [March 2, 2022, 12:32pm UTC](https://discourse.slicer.org/t/unexpected-3d-volume-generated/22259 "2022-03-02T12:32:57Z")
**Posts on this page:** 1
**Showing post:** 2

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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, 2022, 1:54pm UTC](https://discourse.slicer.org/t/unexpected-3d-volume-generated/22259/2 "2022-03-02T13:54:40Z")

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It looks like you have variable slice spacing and need to enable acquisition geometry regularization option. These links should help.

> [@Understanding CT Image spacing and Acquisition geometry regularization](https://discourse.slicer.org/t/understanding-ct-image-spacing-and-acquisition-geometry-regularization/19001):
>
> Dear all, "Images are not equally spaced (a difference of 0.6 vs 0.3 was detected)’ Why does this error occur? What causes the acquisition of acquired irregular geometry? is it something to do with CT machine, protocol, technique or just a problem with exporting the data? with Acquisition geometry regularization correction transform applied, I tried to harden the transformation and I expected the corrected version of the image to persist but it changed to the original? is this the expected b…

> **[DICOM — 3D Slicer documentation](https://slicer.readthedocs.io/en/latest/user_guide/modules/dicom.html#basic-usage)**

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