[vtkusers] loading a vtkImageData correctly

[Mark Wyszomierski]

Hi Matieu,

I tested a bunch of studies, and one is handled unexpectedly - it is a
coronal study. The cols/rows are heading to the feet/left
respectively. The images move from anterior to posterior.

I am directing the output of vtkDICOMImageReader to vtkImageData and
then volume rendering it:

    vtkImageData = vtkDICOMImageReader->GetOutput() // pseudocode

the initial position of the volume is such that it seems the patient's
back is toward the camera (I would have expected the front of the
patient to be facing the camera). The end effect is that the left and
right side of the patient get swapped. Is this normal behavior for
this type of ordering? I may just be doing something incorrectly, but
it seemed to work fine for my other axial and sagital tests.

Thanks,
Mark


On 3/8/07, Mark Wyszomierski <markww at gmail.com> wrote:
> Mathieu,
>
> So far vtkDICOMImageReader looks good - seems that it handles the
> 'inside out' studies correctly. What a life saver!
>
> Thanks,
> Mark
>
> On 3/8/07, Mathieu Malaterre <mathieu.malaterre at kitware.com> wrote:
> > We have also our own implementation in GDCM:
> >
> > http://groups.google.com/group/comp.protocols.dicom/browse_frm/thread/962794718131167c/ddf92d03f6fa84b4
> >
> > good luck,
> > -M
> >
> > Mark Wyszomierski wrote:
> > > Ah I just found a quick example of using vtkDICOMImageReader to read a
> > > series of images to create a volume - this method would be much more
> > > preferable than writing my own code to do it (leave it to the
> > > experts).
> > >
> > > I'll give it a try now, thanks again.
> > >
> > > Mark
> > >
> > > On 3/8/07, Mark Wyszomierski <markww at gmail.com> wrote:
> > >> Hi Mathieu,
> > >>
> > >> First off - thanks for replying. I took a look at the
> > >> vtkDICOMImageReader class - it looks like it only reads a single image
> > >> - is there any class that handles reading an entire series and then
> > >> orders them 'correctly' based on IPP + IOP?
> > >>
> > >> I read through the other links you posted but it will take me a few
> > >> more reads to understand the right way to figure out the ordering
> > >> using IPP + IOP,
> > >>
> > >> Thanks,
> > >> Mark
> > >>
> > >> On 3/8/07, Mathieu Malaterre <mathieu.malaterre at kitware.com> wrote:
> > >> > Mark Wyszomierski wrote:
> > >> > > Hi,
> > >> > >
> > >> > > I have two axial studies - one scanned from head to foot, the other
> > >> > > scanned from foot to head.
> > >> > >
> > >> > > What can I do to load each study correctly into a vtkImageData?
> > >> > > Previously I was simply loading them in a slice at a time based on
> > >> > > instance number, but this fails miserably for the study which was
> > >> > > scanned head to foot (the volume comes out backwards).
> > >> >
> > >> >
> > >> > Hi Mark,
> > >> >
> > >> >
> > >> >   See my answer to your post in dicom newsgroup. I would also suggest
> > >> > you have a look at what is being done in vtkDICOMImageReader. This is
> > >> > exactly the same idea, you order IPP along the normal (computed
> > >> using IOP).
> > >> >
> > >> > HTH
> > >> > -Mathieu
> > >> >
> > >>
> > >
> >
> >
>