[ITK-users] DICOM Dataset GetOrigin

[Matt McCormick]

Hi Filippo,

Yes, those results are odd.

What is the resulting Spacing and Direction of the itk::Image?

Thanks,
Matt

On Mon, May 1, 2017 at 10:52 AM, Filippo Brogi <filippo.brogi at topic.nl>
wrote:

>
> Hello guys,
> I'm reading a dicom dataset formed by 17 MR images using ITK 4.9.1.
>
> According to the documentation  "Origin" is the physical position of the
> pixel whose "Index" is all zeros, but the GetOrigin() method is returning
> the physical position of index = {0, 0, 16}.
>
>
> Here a simplified code snippet
>
>         SeriesReaderType::Pointer reader = SeriesReaderType::New();
>         ImageIOType::Pointer dicomIO = ImageIOType::New();
>         reader->SetImageIO( dicomIO );
>
>         // mFilenames contains the list of dicom files
>         reader->SetFileNames ( mFileNames );
>         try
>         {
>                 reader->Update();
>
>                 auto pImage = reader->GetOutput();
>
>                 ShortImageType3D::PointType point1;
>                 ShortImageType3D::IndexType index1 = {0, 0, 0};
>
>                 pImage->TransformIndexToPhysicalPoint( index1, point1 );
>
>                 double imgPos[3];
>                 imgPos[0] = dicomIO->GetOrigin(0);
>                 imgPos[1] = dicomIO->GetOrigin(1);
>                 imgPos[2] = dicomIO->GetOrigin(2);
>
>                 ShortImageType3D::IndexType indexOfOrigin;
>                 ShortImageType3D::PointType point2;
>                 point2[0] = imgPos[0];
>                 point2[1] = imgPos[1];
>                 point2[2] = imgPos[2];
>                 pImage->TransformPhysicalPointToIndex(point2,
> indexOfOrigin);
>         }
>         catch(itk::ExceptionObject &)
>         {
>                 std::cout << "ERROR" << std::endl;
>                 return res;
>         }
>
> This is the console output:
>
> GetOrigin (-172.9, -116.666, 55.594)
> [-99.3719, -182.98, -25.5239] - index = [0, 0, 0]
> [-172.9, -116.666, 55.594] - index = [0, 0, 16]
>
> Am I doing something wrong?
> Thanks in advance
>
>
>
>
> --
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> com/DICOM-Dataset-GetOrigin-tp38167.html
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