【C#】使用fo-dicom完成DICOM檔案圖像轉換為BMP等

直接上代碼：

DicomFile dcmFile = DicomFile.Open(filename);
            var name = dcmFile.Dataset.GetString(DicomTag.PatientName);
            ushort bitStore = dcmFile.Dataset.GetSingleValue<ushort>(DicomTag.BitsStored);
            ushort bitAlloced = dcmFile.Dataset.GetSingleValue<ushort>(DicomTag.BitsAllocated);
            ushort simplePerPixel = dcmFile.Dataset.GetSingleValue<ushort>(DicomTag.SamplesPerPixel);
            ushort width = dcmFile.Dataset.GetSingleValue<ushort>(DicomTag.Columns);
            ushort height = dcmFile.Dataset.GetSingleValue<ushort>(DicomTag.Rows);
            int windowCenter = dcmFile.Dataset.GetSingleValue<int>(DicomTag.WindowCenter);
            int windowWidth = dcmFile.Dataset.GetSingleValue<int>(DicomTag.WindowWidth);
            string modality = dcmFile.Dataset.GetString(DicomTag.Modality);
            var gdiImg = new Bitmap(width, height);
            if (bitStore > 8)
            {
                ushort[] datass = dcmFile.Dataset.GetValues<ushort>(DicomTag.PixelData);
                ushort maxVal = datass.Max();
                ushort minVal = datass.Min();
                double compressFactor = byte.MaxValue / (double)(maxVal - minVal) - 0.00000000001;
                if (simplePerPixel == 1) // gray
                {
                    System.Drawing.Color c = System.Drawing.Color.Empty;
                    for (int i = 0; i < height; i++)
                    {
                        for (int j = 0; j < width; j++)
                        {
                            int grayGDI;
                            double gray = datass[i*width + j];
                            //int grayStart = (windowCenter - windowWidth / 2);
                            //int grayEnd = (windowCenter + windowWidth / 2);
                            //if (gray < grayStart)
                            //{
                            //    grayGDI = 0;
                            //}
                            //else if (gray > grayEnd)
                            //{
                            //    grayGDI = 255;
                            //}
                            //else
                            //{
                            //    grayGDI = (int)((gray - grayStart) * 255 / windowWidth);
                            //}
                            //if (grayGDI > 255)
                            //{
                            //    grayGDI = 255;
                            //}
                            //else if (grayGDI < 0)
                            //{
                            //    grayGDI = 0;
                            //}
                            //if (modality == "CT")
                            //{
                            //    grayGDI = 255 - grayGDI;
                            //}

                            grayGDI = (int)(gray*compressFactor);
                            c = System.Drawing.Color.FromArgb(grayGDI, grayGDI, grayGDI);
                            gdiImg.SetPixel(j,i,c);
                        }
                    }
                    gdiImg.Save(@"e:\dicom2bmp.bmp", System.Drawing.Imaging.ImageFormat.Bmp);
                }
                else if (simplePerPixel == 3) //RGB
                {
                    //c = Color.FromArgb(pixData[0], pixData[1], pixData[2]);
                }
            }
            else
            {
                byte[] datas = dcmFile.Dataset.GetValues<byte>(DicomTag.PixelData);
                if (simplePerPixel == 1) // gray
                {

                }
                else if (simplePerPixel == 3) //RGB
                {

                }
            }           

代碼隻實作了灰階圖像轉換（圖像存儲為OW，OB的代碼基本相同），彩色圖像轉換更簡單。

目前代碼存在的問題是轉為DICOM圖像後失真較嚴重，和直接檢視DICOM檔案有一定的差别。僅供學習參考。

同時圖像存儲的TAG不僅有7FE0,0010，還有7FE0,0008和7FE0,0009，這兩種格式存儲的DICOM檔案暫時還沒有。關于DICOM标準的研究也是在逐漸進行中。

fo-dicom是一個跨平台的DICOM開源庫，目前支援Android，iOS還有電腦。是值得學習的一個開源庫。