[Insight-users] ManagedITK DICOM Losing Color

[Dan Mueller]

Hi rlee,

The problem seems to be that you are using ManagedITK to read a signed
short (SS2) image. By using this image you are forcing the reader to
cast the DICOM image to a single channel (greyscale) image. You are
then passing this single channel buffer to the bitmap (when it is
expecting a 3 channel buffer). Instead you should read using a RGB
image, eg.

itkImageBase image = itk.Image_RGBUC2.New();

Note that by default only unsigned char RGB images are wrapped... You
will have to turn on the WRAP_rgb_unsigned_short when you compile
ManagedITK.

(BTW: you may want to look at section 4.1.6 of the ManagedITK manual
which shows the best way to import an ITK image buffer into a .NET
bitmap.)

Hope this helps.

Regards, Dan

2008/11/5 rlee <rlee at usc.edu>:
>
> I'm trying to use ManagedITK 3.8 to read in a DICOM ultrasound with transfer
> syntax 1.2.840.10008.1.2.4.70 (Lossless JPEG) and convert it to a Bitmap
> using the following code:
>
> itkImageBase image = itk.itkImage_SS2.New();
> itk.itkImageFileReader_ISS2 reader = itk.itkImageFileReader_ISS2.New();
> itk.itkGDCMImageIO gdcmImageIO = itk.itkGDCMImageIO.New();
> reader.SetImageIO(gdcmImageIO);
>
> reader.FileName = dicomFileInfo.FullName;
> reader.Update();
> reader.GetOutput(image);
>
> Bitmap bitmap;
> PixelFormat format = PixelFormat.Format24bppRgb;
>
> bitmap = new Bitmap(image.Size[0], image.Size[1], format);
> itk.itkImageRegionConstIteratorWithIndex_ISS2 iterator = new
> itk.itkImageRegionConstIteratorWithIndex_ISS2(image,
> image.LargestPossibleRegion);
> int pixelCounter = 0;
>
> The salient DICOM headers are:
>
> 0028,0002 Samples Per Pixel = 3
> 0028,0004 Photometric Interpretation = RGB
> 0028,0006 Planar Configuration = 0
> 0028,0010 Rows = 480
> 0028,0011 Columns = 640
> 0028,0100 Bits Allocated = 8
> 0028,0101 Bits Stored = 8
> 0028,0102 High Bit = 7
> 0028,0103 Pixel Representation = 0
>
> Strangely, the resulting image object has a "number of components per pixel"
> = 1. When I render the bitmap, it is a shade of blue.
>
> When I try loading DICOM images with the default transfer syntax, I notice
> the same effect. There is only one component per pixel and the bitmap
> renders a a shade of blue.
>
> Can someone let me know if I'm approaching this incorrectly?
>
> Thanks!
>
> rlee
> --
> View this message in context: http://www.nabble.com/ManagedITK-DICOM-Losing-Color-tp20337287p20337287.html
> Sent from the ITK - Users mailing list archive at Nabble.com.
>
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