[Insight-users] Reading Dicom files

[Hoole, Andrew]

Hi All

 

I'm new to the ITK stuff and having been working through the User guide. I
have used the code in the guide to read a DICOM file and display it in a
window. When I read the file it doesn't appear to read the information
related to the pixel size or the origin of the image. This information is
embedded in the DICOM is there a way to make the reader get this data or is
the problem with the image which I hook onto the output of the reader. The
code I am using is as follows:

 

            typedef signed short InputPixelType;

            const unsigned int   InputDimension = 2;

 

            typedef itk::Image< InputPixelType, InputDimension >
InputImageType;

            typedef itk::ImageFileReader< InputImageType > ReaderType;

 

            ReaderType::Pointer reader = ReaderType::New();

            reader->SetFileName("c:\\temp\\test.dcm");

            typedef itk::GDCMImageIO           ImageIOType;

 

            ImageIOType::Pointer gdcmImageIO = ImageIOType::New();

  

            reader->SetImageIO( gdcmImageIO );

            try {

                        reader->Update();

            } 

            catch (itk::ExceptionObject & e){

                        AfxMessageBox("Exception in file reader
",MB_OK,NULL);

                        return;

            }

 

            typedef itk::Point< double, InputImageType::ImageDimension >
PointType;

            PointType point;

            InputImageType::IndexType pixelIndex;

            InputImageType::PixelType pixelValue;

            InputImageType::Pointer image = reader->GetOutput();

 

            InputImageType::SpacingType spacing;

            spacing[0] = 0.5; // spacing along X

            spacing[1] = 0.5; // spacing along Y

            image->SetSpacing( spacing );

            

            InputImageType::PointType origin;

            origin[0] = -128.0; // coordinates of the

            origin[1] = -128.0; // first pixel in N-D

            image->SetOrigin( origin );          

            

As you can see I am manually setting the pixel size and origin which is not
ideal. 

 

Regards

 

Andrew Hoole 

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