# read and render transformed DICOM image from 3D slicer
**URL:** https://discourse.itk.org/t/read-and-render-transformed-dicom-image-from-3d-slicer/2291
**Category:** Beginner Questions
**Tags:** python
**Created:** [October 1, 2019, 8:04am UTC](https://discourse.itk.org/t/read-and-render-transformed-dicom-image-from-3d-slicer/2291 "2019-10-01T08:04:48Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@TY\_Park](https://discourse.itk.org/u/TY_Park)
#### Post date: [October 1, 2019, 8:04am UTC](https://discourse.itk.org/t/read-and-render-transformed-dicom-image-from-3d-slicer/2291/1 "2019-10-01T08:04:48Z")
I have the 2 DICOM images (MRI and CT)
And I performed rigid registration between MRI and CT (the CT was transformed) in “3D Slicer”
Then I would like to do volume rendering use transformed CT image
However, the transformation did not work properly
This is my code,
> ```
> image_t = itk.Image[itk.F, 3]
> reader = itk.ImageSeriesReader[image_t].New()
> dicomIO = itk.GDCMImageIO.New()
> dicomFN = itk.GDCMSeriesFileNames.New()
> reader.SetImageIO(dicomIO)
>
> dicomFN.SetUseSeriesDetails(True)
> dicomFN.SetDirectory(filename)
>
> uids = dicomFN.GetSeriesUIDs()
> frames = dicomFN.GetFileNames(uids[0])
>
> reader.SetFileNames(frames)
> reader.Update()
> image = reader.GetOutput()
>
> orienter = itk.OrientImageFilter[image_t, image_t].New()
> orienter.UseImageDirectionOn()
> orienter.SetInput(image)
> orienter.Update()
>
> itk_vtk_converter = itk.ImageToVTKImageFilter[image_t].New()
> itk_vtk_converter.SetInput(orienter.GetOutput())
> itk_vtk_converter.Update()
>
> vtk_image = vtk.vtkImageData()
> vtk_image.DeepCopy(itk_vtk_converter.GetOutput())
>
> ```
---
### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [October 1, 2019, 5:04pm UTC](https://discourse.itk.org/t/read-and-render-transformed-dicom-image-from-3d-slicer/2291/2 "2019-10-01T17:04:03Z")
Perhaps you need to choose “harden transform” in Slicer before you save your transformed CT image?
> transformation did not work properly
Can you be more specific? Transform was not applied? Transform is wrong?
---
### Author:  [@TY\_Park](https://discourse.itk.org/u/TY_Park)
#### Post date: [October 2, 2019, 10:10am UTC](https://discourse.itk.org/t/read-and-render-transformed-dicom-image-from-3d-slicer/2291/3 "2019-10-02T10:10:06Z")
If I don’t use the “orientaer.UseImageDirectionOn” the transformation was not applied.
then if I use the “orientaer.UseImageDirectionOn” the transformation is wrong.
---
### Author:  [@matt.mccormick](https://discourse.itk.org/u/matt.mccormick)
#### Post date: [October 2, 2019, 1:10pm UTC](https://discourse.itk.org/t/read-and-render-transformed-dicom-image-from-3d-slicer/2291/4 "2019-10-02T13:10:33Z")
VTK does not currently support oriented images, but support has been added for the next release of VTK [as discussed here](https://discourse.vtk.org/t/proposal-to-add-orientation-to-vtkimagedata-feedback-wanted/120).
---
### Author:  [@dzenanz](https://discourse.itk.org/u/dzenanz)
#### Post date: [October 2, 2019, 2:00pm UTC](https://discourse.itk.org/t/read-and-render-transformed-dicom-image-from-3d-slicer/2291/5 "2019-10-02T14:00:57Z")
Maybe you will find [this](https://vtk.org/Wiki/VTK/ExamplesBoneYard/Cxx/VolumeRendering/itkVtkImageConvert) and [this](https://vtk.org/Wiki/index.php?title=ITK/Examples/WishList/IO/itkVtkImageConvertDICOM&oldid=51003) example useful.
---
### Author:  [@TY\_Park](https://discourse.itk.org/u/TY_Park)
#### Post date: [October 4, 2019, 2:19am UTC](https://discourse.itk.org/t/read-and-render-transformed-dicom-image-from-3d-slicer/2291/6 "2019-10-04T02:19:24Z")
I solved this problem using dzenanz’s example
Thanks a lot !