C ＃ - C ＃ process and convert pixeldata of CT images with fo DICOM

from ：c# - C# use fo-dicom Yes CT Graphic PixelData Process and transform - IT Tool network

For some tests , I tried to manipulate  PixelData With dicom Format stored CT The elements of the image , And use C# Medium Fellow Oak Dicom Write it back to the file . After some research , I found that the matrix I wanted to deal with was  Buffer  in . Of  PixelData Stored in  byte - Large numbers . So I wrote the following code :

DicomFile ctFile = DicomFile.Open(image); var pixDat = ctFile.Dataset.Get<byte[]>(DicomTag.PixelData); for (int i = 0; i < pixData.Length; i++) { pixDat[i] = Convert.ToByte(200); } ctFile.Dataset.AddOrUpdate<byte[]>(DicomTag.PixelData, pixDat); ctFile.Save("new file folder"); 

This is my first attempt , I got it.  Exception stay  AddOrUpdate command , Because it can't convert  byte - Array to OB.
Read for example Pianykh About DICOM The book of ,OB Represents other byte strings . But so far I can't convert the manipulated  byte - Array to OB. When I try this code snippet :

DicomOtherByte dob = new DicomOtherByte(DicomTag.PixelData, pixDat); ctFile.Dataset.AddOrUpdate<DicomOtherByte>(DicomTag.PixelData, dob); 

Exception Still calling  AddOrUpdate Because the project cannot be converted to OB. stay stackoverflow、git or google Medium fo-dicom I still don't know how to deal with it . So I want to know how to convert my manipulation matrix into OB, Because I think  DicomOtherByte yes OB.

edit :Exception yes “ Can't use Dicom.DicomOtherByte Value creation of type OB Type of DICOM Elements ” - System.InvalidOperationException

Thank you in advance .

The best answer

Dicom The pixel data in the dataset is very special . It cannot be easily read or written as a single tag . Fo-Dicom Special functions and classes for processing pixel data .

Here is an example :

DicomFile ctFile = DicomFile.Open(@"C:\Temp\original.dcm"); // Create PixelData object to represent pixel data in dataset DicomPixelData pixelData = DicomPixelData.Create(ctFile.Dataset); // Get Raw Data byte[] originalRawBytes = pixelData.GetFrame(0).Data; // Create new array with modified data byte[] modifiedRawBytes = new byte[originalRawBytes.Length]; for (int i = 0; i < originalRawBytes.Length; i++) { modifiedRawBytes[i] = (byte)(originalRawBytes[i] + 100); } // Create new buffer supporting IByteBuffer to contain the modified data MemoryByteBuffer modified = new MemoryByteBuffer(modifiedRawBytes); // Write back modified pixel data ctFile.Dataset.AddOrUpdatePixelData(DicomVR.OB, modified); ctFile.Save(@"C:\Temp\Modified.dcm"); 

Please note that , There are more helper classes that can directly process pixel data in a specific format , for example  PixelDataConverter and  PixelDataFactory .

Besides , If you want to use actual images , Please use  DicomImage class (class).

DicomImage image = new DicomImage(ctFile.Dataset); 

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