I'm using the ClearCanvas.Dicom library in my application and working on a project only containing gray value images (CT and RTDose). I'm impress how easy DICOM can be i C# - thank you guys.

I would like to access the decompressed image data from the DICOM file and load the gray values (HU as integers) or dose (doubles). I need to do some image processing (enhancement, segmentation and registration) using a seperate numerical library.

I do NOT need W/L or any references to the ImageViewer like drawing the bitmap as suggested elsewhere in the forum:

ImageSop imgSop = new ImageSop(fname); Frame frame = imgSop.Frames[1];
IPresentationImage pi = PresentationImageFactory.Create(frame);
Bitmap bmp = pi.DrawToBitmap(frame.Columns, frame.Rows);

So, how do I get the gray values - will DicomPixelData do the job?

Have a look at the method ClearCanvas.ImageViewer.RoiGraphics.RoiStatistics.CalculateMean - it shows how to inspect the pixel data and then process it through the modality LUT, the output of which for CT is HU.

I'm not that familiar with the RTDose stuff, so I can't really help you there.

Hope this helps,
Stewart

Thanks you for the tip. I have copied a possible solution from the ClearCanvas.ImageViewer.RoiGraphics.Roi() constructor:

IImageGraphicProvider provider = pi as IImageGraphicProvider;
// ... some code
PixelData _pixelData = provider.ImageGraphic.PixelData;
// ... process image pixels

Unfortunately this involves references to the ImageServer, but is it possible to access the uint16 gray values using only the DICOM library?