HOW TO: Control J2K compression in DICOM Files

#1 Posted : Thursday, August 31, 2017 4:07:19 PM(UTC)

Nick Villalobos

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Posts: 119

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Below you will find a basic C# code sample on how you can load in your DICOM then save it out to a JPEG2000 compression type which will greatly decrease the file size.

When doing this compression, you will be using the DicomJpeg2000Options structure. Once you have your options initialized, then you can begin setting the options for the new DICOM file.

There are two main enumerations that will be used in this process:

CompressionControl - Gets or sets the flag that indicates how to determine the resulting compression.
CompressionRatio - Gets or sets the integer value that indicates the compression ratio to use.

Once you have these enumerations set for the DicomJpeg2000Options you will need to give the options to the dataset itself.

Now you can use ChangeTransferSyntax to change the transfer syntax of the data set.

Finally, you can save the data set using the Save method.

With these setting I was able to compress a DICOM file from 854kb down to 36KB.

Code:


DicomEngine.Startup();
using (DicomDataSet ds = new DicomDataSet())
{
   //Load DICOM File 
   ds.Load(input, DicomDataSetLoadFlags.None);

   //Initialize J2K Options
   DicomJpeg2000Options options = ds.DefaultJpeg2000Options;

   //Set Options
   options.CompressionControl = DicomJpeg2000CompressionControl.Ratio;
   options.CompressionRatio = 50;

   //Add options to the dataset
   ds.Jpeg2000Options = options;

   //Change the transfer syntax to J22K
   ds.ChangeTransferSyntax(DicomUidType.JPEG2000, 2, ChangeTransferSyntaxFlags.MinimizeJpegSize);

   //Save Dicom file
   ds.Save(dest, DicomDataSetSaveFlags.None);

   //Shut down the DICOM engine
   DicomEngine.Shutdown();
}

Edited by moderator Friday, December 29, 2017 8:51:29 AM(UTC) | Reason: Changed subject to better reflect content

Nick Villalobos
Developer Support Engineer
LEAD Technologies, Inc.


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HOW TO: Control J2K compression in DICOM Files