Extracting an Image from a DICOM file

When dealing with DICOM files, there are times when you need to include an image in a report or provide images to a patient so they can view the data without needing a DICOM-specific application. Thankfully, the LEADTOOLS Medical SDK makes it easy for you to create an application to extract an image from a DICOM file.

Below are some C# and Java code snippets to extract an image from a DICOM file.

C# code to extract image from a DICOM file

void ExtractDicomImage(string sourceFilePath)
{
    DicomEngine.Startup();
    using (DicomDataSet ds = new DicomDataSet())
    {
        ds.Load(sourceFilePath, DicomDataSetLoadFlags.None);

        DicomElement pixelDataElement = ds.FindFirstElement(null, DicomTag.PixelData, true);
        if (pixelDataElement == null)
        {
            Console.WriteLine("This dataset is missing the pixel data element");
            return;
        }

        if (ds.GetImageCount(pixelDataElement) == 0)
        {
            Console.WriteLine("Sample: This dataset has no images");
            return;
        }

        DicomImageInformation imageInformation = ds.GetImageInformation(pixelDataElement, 0);
        if (imageInformation == null)
        {
            Console.WriteLine("Sample: Can't retrieve image information");
            return;
        }

        RasterImage image = ds.GetImage(pixelDataElement, 0, 0, RasterByteOrder.Gray, DicomGetImageFlags.AllowRangeExpansion | DicomGetImageFlags.AutoApplyModalityLut | DicomGetImageFlags.AutoApplyVoiLut);

        if (image == null)
        {
            Console.WriteLine("Sample: Can't retrieve image");
            return;
        }

        using (RasterCodecs codecs = new RasterCodecs())
        {
            codecs.Save(image, "C:/LEADTOOLS22/Resources/Images/OutputDicomFile.jpg", RasterImageFormat.Jpeg, image.BitsPerPixel);
        }
    }

    DicomEngine.Shutdown();
}

Java code to extract image from a DICOM File

void ExtractDicomImage(String sourceFilePath)
{
    DicomEngine.startup();
    DicomDataSet ds = new DicomDataSet("C:/LEADTOOLS22/Resources/");
        
    ds.load(sourceFilePath, DicomDataSetLoadFlags.NONE);
    
    DicomElement pixelDataElement = ds.findFirstElement(null, DicomTag.PIXEL_DATA, true);
    if (pixelDataElement == null)
    {
        System.out.println("This dataset is missing the pixel data element");
        return;
    }
    
    if (ds.getImageCount(pixelDataElement) == 0)
    {
        System.out.println("Sample: this dataset has no images");
        return;
    }
    
    DicomImageInformation imageInformation = ds.getImageInformation(pixelDataElement, 0);
    if (imageInformation == null)
    {
        System.out.println("Sample: Can't retrieve image information");
        return;
    }
    
    RasterImage image = ds.getImage(pixelDataElement, 0, 0, DicomGetImageFlags.ALLOW_RANGE_EXPANSION | DicomGetImageFlags.AUTO_APPLY_MODALITY_LUT | DicomGetImageFlags.AUTO_APPLY_VOI_LUT);

    if (image == null)
    {
        System.out.println("Sample: Can't retrieve image");
        return;
    }
    
    RasterCodecs codecs = new RasterCodecs();
            
    codecs.save(image, "C:/LEADTOOLS22/Resources/Images/OutputDicomFile.jpg", RasterImageFormat.JPEG, image.getBitsPerPixel());
    
    codecs.dispose();
    ds.dispose();
    DicomEngine.shutdown();
}

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About Gabriel Smith

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