# DICOM and VTK file orientation Issue

**URL:** <https://discourse.slicer.org/t/dicom-and-vtk-file-orientation-issue/717>\
**Category:** Development\
**Created:** [July 19, 2017, 12:23pm UTC](https://discourse.slicer.org/t/dicom-and-vtk-file-orientation-issue/717 "2017-07-19T12:23:42Z")\
**Posts on this page:** 1\
**Showing post:** 7

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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:** [July 20, 2017, 1:04pm UTC](https://discourse.slicer.org/t/dicom-and-vtk-file-orientation-issue/717/7 "2017-07-20T13:04:17Z")

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Most common issue is LPS/RAS coordinate system mismatch. So, may try to convert your data from LPS to RAS coordinate system by transforming it using Transforms module by a matrix that has [-1,-1,1,1] in the diagonal:

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/b/9/b9faa9c7ce7284e3e97ef74d293d629977ec889f.png)

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_[View the full topic](https://discourse.slicer.org/t/dicom-and-vtk-file-orientation-issue/717)._