protected override DisplayData CreateDisplayData() { var sopInstanceUid = _imageBase.SOPInstanceUID; if (DisplayDataTable.ContainsKey(sopInstanceUid)) { return(DisplayDataTable[sopInstanceUid]); } var sop = StudyTree.GetSop(sopInstanceUid); var displayData = sop == null ? DataAccessor.CreateImageDataBySOPInstanceUID(sopInstanceUid, true) : CreateDisplayDataBy(sop); DisplayDataTable.Add(sopInstanceUid, displayData); return(displayData); }