LEADTOOLS Support
Multimedia
Multimedia SDK Examples
HOW TO: Create and save a Region of Interest in a DICOM Image using a presentation state file
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Tuesday, June 4, 2019 2:05:13 PM(UTC)
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Attached is a sample Winforms project that uses the Leadtools.Dicom and Leadtools.MedicalViewer libraries to create a Presentation State file containing a Region of Interest that can be saved and reloaded.
To initialize the Presentation state file, a new DicomDataSet has to be created and the relevant tags from the loaded DICOM file is brought over:
Code: void InitPre()
{
if (preDs == null)
{
preDs = new DicomDataSet();
preDs.Reset();
preDs.Initialize(DicomClassType.ColorSoftcopyPresentationState, DicomDataSetInitializeFlags.AddMandatoryElementsOnly | DicomDataSetInitializeFlags.AddMandatoryElementsOnly | DicomDataSetInitializeFlags.ExplicitVR);
preDs.AddPresentationStateImageReference(ds, null, 0);
preDs.InsertElementAndSetValue(DicomTag.PatientID, ds.GetStringValue(ds.FindFirstElement(null, DicomTag.PatientID, false), 0));
preDs.InsertElementAndSetValue(DicomTag.SeriesInstanceUID, GenerateNewUid("1.2.840.114257.1.1"));
preDs.InsertElementAndSetValue(DicomTag.StudyInstanceUID, ds.GetStringValue(ds.FindFirstElement(null, DicomTag.StudyInstanceUID, false), 0));
preDs.InsertElementAndSetValue(DicomTag.SOPInstanceUID, GenerateNewUid("1.2.840.114257.1.1"));
}
}
Once the user adds a Region to the MedicalWebViewer using MedicalViewerActionType of PolygonRegion (or any other shaped region) a 1-bit mask is created and saved into the OverlayImage of the image in the DICOM file.
Code:void UpdateOverlay(RasterImage overlayImage)
{
cell.Image.SetOverlayImage(0, overlayImage, RasterGetSetOverlayImageMode.Copy);
var attributes = cell.Image.GetOverlayAttributes(0, RasterGetSetOverlayAttributesFlags.Flags | RasterGetSetOverlayAttributesFlags.Origin | RasterGetSetOverlayAttributesFlags.Color | RasterGetSetOverlayAttributesFlags.Dicom);
attributes.AutoProcess = true;
attributes.AutoPaint = true;
attributes.BitsAllocated = 1;
attributes.Type = "R";
attributes.Origin = LeadPoint.Create(0, 0);
attributes.Description = "ROI Overlay";
attributes.Rows = overlayImage.ImageHeight;
attributes.Columns = overlayImage.ImageWidth;
attributes.ImageFrameOrigin = 1;
attributes.FramesInOverlay = cell.Image.PageCount;
attributes.Color = new RasterColor(0, 255, 255, 255);
overlayImage.UpdateOverlayAttributes(0, attributes, RasterGetSetOverlayAttributesFlags.Flags | RasterGetSetOverlayAttributesFlags.Origin | RasterGetSetOverlayAttributesFlags.Color | RasterGetSetOverlayAttributesFlags.Dicom);
preDs.AddPresentationStateImageReference(ds, null, 0);
preDs.SetOverlayAttributes(0, attributes, DicomSetOverlayFlags.None);
preDs.SetOverlayImage(0, overlayImage);
}
Once the region is set, it is saved to the file:
Code:
SaveFileDialog dlg = new SaveFileDialog();
dlg.Filter = "Pre | *.pre";
if (dlg.ShowDialog() == DialogResult.OK)
preDs.Save(dlg.FileName, DicomDataSetSaveFlags.None);
Then it can be reloaded at a later date by the following:
Code: OpenFileDialog dlg = new OpenFileDialog
{
Filter = "DICOM Pre Files (*.pre)|*.PRE"
};
if (dlg.ShowDialog() == DialogResult.OK)
{
InitPre();
preDs.Load(dlg.FileName, DicomDataSetLoadFlags.None);
if (preDs.OverlayCount > 0)
{
overlayImage = preDs.GetOverlayImage(0);
cell.Image.AddMaskToRegion(null, overlayImage, RasterRegionCombineMode.Set);
cell.Invalidate();
}
}
Hadi Chami
Developer Support Manager
LEAD Technologies, Inc.
LEADTOOLS Support
Multimedia
Multimedia SDK Examples
HOW TO: Create and save a Region of Interest in a DICOM Image using a presentation state file
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