diff --git a/IRaCIS.Core.Application/Service/ImageAndDoc/StudyService.cs b/IRaCIS.Core.Application/Service/ImageAndDoc/StudyService.cs
index 3283be4b5..40e66de8d 100644
--- a/IRaCIS.Core.Application/Service/ImageAndDoc/StudyService.cs
+++ b/IRaCIS.Core.Application/Service/ImageAndDoc/StudyService.cs
@@ -214,6 +214,10 @@ namespace IRaCIS.Core.Application.Service.ImageAndDoc
                         foreach (var instanceItem in seriesItem.InstanceList)
                         {
                             var isntance = _mapper.Map<DicomInstance>(instanceItem);
+
+                            Guid instanceId = IdentifierHelper.CreateGuid(study.StudyInstanceUid, series.SeriesInstanceUid, isntance.SopInstanceUid, study.TrialId.ToString());
+
+                            isntance.Id = instanceId;
                             isntance.StudyId = study.Id;
                             isntance.SeriesId = series.Id;