CT images acquired with gantry tilt are loaded incorrectly, probably the gantry tilt information is ignored. The image appears to be warped.

See for example this discussion:
https://discourse.slicer.org/t/how-to-adjust-the-distorted-image/817

Workaround: use a tool that can convert gantry-tilted DICOM to rectified image files. For example: dicomtonifti tool. Download from here: https://github.com/dgobbi/vtk-dicom/releases

Potential implementation: use vtkDICOM classes.
https://github.com/dgobbi/vtk-dicom/blob/master/Source/vtkDICOMCTRectifier.h

CT images acquired with gantry tilt are loaded incorrectly, probably the gantry tilt information is ignored. The image appears to be warped.

See for example this discussion:
https://discourse.slicer.org/t/how-to-adjust-the-distorted-image/817

Workarounds: use a tool that can convert gantry-tilted DICOM to rectified image files. For example:
http://www.nitrc.org/plugins/mwiki/index.php/dcm2nii:MainPage#Special_Considerations_for_Computed_Tomography_.28CT.2C_CAT.29

Potential implementation: use vtkDICOM classes.
https://github.com/dgobbi/vtk-dicom/blob/master/Source/vtkDICOMCTRectifier.h