Modifying DicomDataset

[Hesham Nabih]

I tried to change Window Center  in Dataset ( It is a tag with VR=DS  and value type of ushort ).
But when we are using the following statement to change this property, the program throws an exception

 DicomImage _image = new DicomImage("C:\\IM1");
 DicomDataset dset = _image.Dataset;
 dset.Add<ushort>(DicomTag.WindowCenter, (ushort)40);

we also tried it with type <decimal> and <int> and still problem is the same.

That is the error message:
Unable to create DICOM element of type DS with values of type System.Int32

We had to hard-coded this way to make it work (in DicomDataset class):

 

 if (vr == DicomVR.DS)
            {
                if (values == null)
                    return Add(new DicomDecimalString(tag, EmptyBuffer.Value));
                if (typeof(T) == typeof(decimal))
                    return Add(new DicomDecimalString(tag, values.Cast<decimal>().ToArray()));
                if (typeof(T) == typeof(string))
                    return Add(new DicomDecimalString(tag, values.Cast<string>().ToArray()));
                if (typeof(T) == typeof(int))
                {
                    return Add(new DicomDecimalString(tag, new decimal[] { 40 }));
                }
            }

Is there any better way to change DicomTag values inside a DicomDataset?

[Hesham Nabih]

With the help see this post at stackoverflow http://chat.stackoverflow.com/rooms/18650/discussion-between-user373721-and-ark-kun
I used the following:
 

 DicomDataset dataset = DicomFile.Open(_filename).Dataset;
            dataset.Add(DicomTag.WindowWidth, "100.0");
 dataset.Add(new DicomCodeString(DicomTag.PhotometricInterpretation, "MONOCHROME1"));
            DicomImage image = new DicomImage(dataset);
            Image result = image.RenderImage(_slicenumber);
            DisplayImage(result);

Now I am trying to figure out how to apply the changes to multiframe images and adjusting window level using trackbar.  Any ideas will be much appreciated

[Mahesh Dubey]

dset.Add(DicomTag.WindowCenter,40M);

Regards

Mahesh

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Thanks And Regards

Mahesh Dubey

[Colby Dillion]

I've taken the time to modify the DicomImage class so that you can set the window/level and it will apply to the rendered image. This setting will apply to all frames in a multiframe image.

var img = new DicomImage(fileName);
img.WindowCenter = 2048.0;
img.WindowWidth = 4096.0;
DisplayImage(img.RenderImage(frameNumber));

[Hesham Nabih]

Thank you so much Colby.