[Insight-users] ManagedITK DICOM Losing Color

[rlee]

Hi Dan,

Thanks for the pointers! I'll try recompiling the ManagedITK with rgb
unsigned short and give that a try. 

rlee



Dan Mueller-2 wrote:
> 
> 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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