[vtkusers] [Gdcm2] Rotate vtkImage with vtkmatrix4x4

[Mark Roden]

Hi Jothy,

Yes it is-- sorry, I thought the code was entirely self contained.

Note that it also has the assignment of the z spacing via the
vtkImageChangeInformation procedure as well.

mark

On Thu, Mar 3, 2011 at 7:29 AM, Jothy <jothybasu at gmail.com> wrote:
> 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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