[Insight-users] Reading DICOM time series study

[Martin Kavec]

Many thanks for the reply, Mark.

unfortunately, you are right. My images come from Philips, therefore I could 
find the tags. However, the fMRI series from GE doesn't have the tags at all, 
and even worst, they dont bother to update Image time and Series time either. 
Or may be they do in the later software releases.

Thanks a lot for explanation.

Martin

On Tuesday 12 July 2005 13:22, Mark Wyszomierski wrote:
> Martin,
>
> My experience has been that Temporal Position Identifier / Number of
> Temporal Position tags are rarely present. I have only seen them
> created by Phillips scanners. I would suggest using image time +
> series time but I have also seen siemens cases for which duplicate
> image times have been present for images in the same series. If you
> are targeting images from only a certain scanner I know that the two
> tags you mentioned will work for the sorting. But if you want a method
> that will consistently sort datasets from multiple manufacturers, it
> is best to rely on a few different tags that can be swapped when
> others are not present.
>
> I have no experience with ITK's DICOM IO classes, but I just wanted to
> throw this out there for you,
>
> Mark
>
> On 7/12/05, Martin Kavec <kavec at messi.uku.fi> wrote:
> > Thanks for the reply, Karthik.
> >
> > Your code may, for sure, be a valid solution. However, after I read your
> > message, I told myself there must be an information related to the time
> > series in the DICOM header of an image. So I randomly grabbed an image
> > from an fMRI time series and found following two (correct) tags
> >
> > 0020,0100  Temporal Position Identifier: 52
> > 0020,0105  Number of Temporal Positions: 120
> >
> > Everything what's needed to construct the 4D image is there, so why not
> > to use it? Quoting myself: Is this a limitation of ITK's DICOM image
> > reader implementation? I would still be tempted to say: yes.
> >
> > What do you say?
> >
> > Regards,
> > Martin
> >
> > On Monday 11 July 2005 14:45, Karthik Krishnan wrote:
> > > I don't think it is not a limitation of the dicom image reader. You
> > > need to do that with your code.
> > >
> > > You could for instance read all the dicom series in the directory and
> > > use the JoinSeriesImageFilter to create a 4D image from the 3D images
> > > you just read. It is not a limitation of the dicom reader because a
> > > dicom file is  a 2D file. So the ImageSeriesReader which passes the set
> > > of filenames to the GDCMImageIO has to be instantiated over an image of
> > > dimension 2+1.
> > >
> > > You could do something like
> > >     const SeriesIdContainer & seriesUID =
> > > nameGenerator->GetSeriesUIDs(); SeriesIdContainer::const_iterator
> > > seriesItr = seriesUID.begin(); SeriesIdContainer::const_iterator
> > > seriesEnd = seriesUID.end(); while( seriesItr != seriesEnd )
> > >       {
> > >       seriesReader->SetFileNames( nameGenerator->GetFileNames(
> > > seriesItr->c_str() ) );
> > >       seriesReader->Update();
> > >       joinSeriesFilter->SetInput( i++, seriesReader->GetOutput() );
> > >       seriesItr++;
> > >       }
> > >
> > > my4DImage = joinSeriesFilter->GetOutput();
> > >
> > > Thanks
> > > karthik
> > >
> > > Martin Kavec wrote:
> > > >Hi,
> > > >
> > > >I have a time series (fMRI, bolus tracking) studies in DICOM format,
> > > > which I am trying to read in. I gave a brief trial test to
> > > >DicomSeriesReadImageWrite2.cxx from Examples/IO. Although I changed
> > > > the Dimension = 4, the output Analyze format image is 3D only. I
> > > > assume that internal itkImage dimension is also 3D.
> > > >
> > > >Is this a limitation of ITK's DICOM image reader implementation?
> > > >
> > > >Regards.
> > > >
> > > >Martin
> > > >_______________________________________________
> > > >Insight-users mailing list
> > > >Insight-users at itk.org
> > > >http://www.itk.org/mailman/listinfo/insight-users
> >
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users

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