GetImageInformation Method

Summary

Retrieves information about the specified image.

Syntax

C++/CLI

Java

public DicomImageInformation GetImageInformation( 
   DicomElement element, 
   int index 
)

public DicomImageInformation getImageInformation(DicomElement element, int index)

public: 
DicomImageInformation^ GetImageInformation(  
   DicomElement^ element, 
   int index 
)

Parameters

element
An item in the Data Set.

index
The zero-based index of the frame whose information is required.

Return Value

The information about the specified image.

Remarks

Most DICOM files will only have one Data Element of type DicomTag.PixelData. Therefore, in most instances you can set the element to null, since the method will automatically retrieve information about the image at the specified index within the only Pixel Data Element in the file. If the element is not null, it must point to the Pixel Data Element itself. If the DICOM file is DicomClassType.BasicDirectory , the file may contain more than one Pixel Data Element. In this case you must specify in the element parameter the Pixel Data Element from which to get the image information.

Example

using Leadtools; 
using Leadtools.Dicom; 
 
 
public void TestDicomImage() 
{ 
   string dicomFileName = Path.Combine(LEAD_VARS.ImagesDir, "DICOM", "image3.dcm"); 
   //Make sure to initialize the DICOM engine, this needs to be done only once  
   //In the whole application 
   DicomEngine.Startup(); 
   using (DicomDataSet ds = new DicomDataSet()) 
   { 
      //Load DICOM File 
      ds.Load(dicomFileName, DicomDataSetLoadFlags.None); 
 
      DicomElement pixelDataElement = ds.FindFirstElement(null, DicomTag.PixelData, true); 
      if (pixelDataElement == null) 
      { 
         Console.WriteLine("This dataset is missing the pixel data element", "Sample"); 
         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; 
      } 
      // Over here we can access the different properties of the DicomImageInformation class to get some 
      // of the image attributes such as bits allocated (DicomImageInformation. BitsAllocated) 
      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; 
      } 
 
      //If the image has more than one frame then we can call DicomDataSet.GetImages to get all the frames 
      using (DicomDataSet ds1 = new DicomDataSet()) 
      { 
         ds1.Initialize(DicomClassType.DXImageStoragePresentation, DicomDataSetInitializeType.ExplicitVRLittleEndian); 
         DicomElement pixelDataElement1 = ds1.FindFirstElement(null, DicomTag.PixelData, true); 
         if (pixelDataElement1 != null) 
         { 
            ds1.SetImage(pixelDataElement1, 
               image, 
               DicomImageCompressionType.None, 
               DicomImagePhotometricInterpretationType.Monochrome2, 
               16, 
               2, 
               DicomSetImageFlags.AutoSetVoiLut); 
            //If we have more than one frame then we can call DicomDataSet.SetImages 
 
            //This is an alternative way to set the image, I will first delete the 
            //existing image and then call DicomDataSet.InsertImage 
            ds1.DeleteElement(pixelDataElement1); 
            pixelDataElement1 = ds1.InsertElement(null, false, DicomTag.PixelData, DicomVRType.UN, false, 0); 
            ds1.InsertImage(pixelDataElement1, 
               image, 
               0, 
               DicomImageCompressionType.None, 
               DicomImagePhotometricInterpretationType.Monochrome2, 
               16, 
               2, 
               DicomSetImageFlags.AutoSetVoiLut); 
            //If we have more than one frame then we can call DicomDataSet.InsertImages 
 
            ds1.Save(Path.Combine(LEAD_VARS.ImagesDir, "DICOM", "Test.dcm"), DicomDataSetSaveFlags.None); 
 
         } 
      } 
      //Load DICOM File 
      ds.Load(dicomFileName, DicomDataSetLoadFlags.None); 
   } 
   DicomEngine.Shutdown(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}