[vtkusers] [Gdcm2] Rotate vtkImage with vtkmatrix4x4

[Jothy]

Thanks Mark!

Is this

 gdcmReader.SetFileNames(sa);

the vtkGDCMImageReader?

Jothy


On Thu, Mar 3, 2011 at 2:46 PM, Mark Roden <mmroden at gmail.com> wrote:

> Hi Jothy,
>
> I've solved this in the past by using cascading image flips.  The
> dicom coordinate system will be modified by this approach, so when you
> write the results out, you have to reverse all the flips.
>
> There are two flips.
>
> The first flips the image into the right space for rtstructs to
> overlay the original image.  As I've said in the past, DICOM specifies
> the upper left coordinate of each image, while VTK will reorder the
> image coordinates based on the orientation vectors.  You're not
> dealing with rtstructs, and I'm not sure how rtdose reacts (if it
> needs the same flipping).
>
> The second flip is for display purposes, as in, making sure that FFS,
> HFS, etc images appear in the proper orientation.
>
> Here is a previous post from November that contains my reading code in
> java:
>
> http://www.vtk.org/pipermail/vtkusers/2010-November/113127.html
>
> HTH,
> Mark
>
>
> On Tue, Mar 1, 2011 at 8:28 AM, Jothy <jothybasu at gmail.com> wrote:
> > Thanks!
> >
> > Now my images appeasr like the one shown in figure.
> >
> > I need to rotate the image and dose about the ImagePositionPatient
> > upside-down.
> >
> > I tried vtkImageFlip - it invalidates the dicom coordinate system and the
> > dose and image doesn't match.
> >
> > I tried this
> >
> >       vtkMatrix4x4 *invert = vtkMatrix4x4::New();
> >
> >         invert->DeepCopy( imageReader->GetDirectionCosines());
> >
> >         invert->Invert();
> >
> >         vtkImageReslice *reslice = vtkImageReslice::New();
> >
> >         reslice->SetResliceAxes( invert );
> >
> >         reslice->SetInput(this->imageData);
> >
> >         reslice->Update();
> >
> >
> > But it doesn't rotate the image.How to rotate the image?
> >
> > Thanks
> >
> > Jothy
> >
> >
> > On Tue, Mar 1, 2011 at 4:07 PM, Jothy <jothybasu at gmail.com> wrote:
> >>
> >> But in this example FileLowerLeft is switched off.
> >>
> >> Thanks
> >>
> >> Jothy
> >>
> >> On Tue, Mar 1, 2011 at 3:50 PM, Mathieu Malaterre
> >> <mathieu.malaterre at gmail.com> wrote:
> >>>
> >>> jothy, I think what you are looking for is already in gdcm, have a look
> >>> at:
> >>> gdcmreslice.cxx
> >>>
> >>> hth
> >>> On Tue, Mar 1, 2011 at 4:31 PM, Jothy <jothybasu at gmail.com> wrote:
> >>> > Hi all,
> >>> >
> >>> > I am trying to rotate vtkImageData using vtkMatrix4x4 about a point.
> is
> >>> > there any example on how to do this?
> >>> >
> >>> > Thanks
> >>> >
> >>> > Jothy
> >>> >
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> >>>
> >>> --
> >>> Mathieu
> >>
> >
> >
> >
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