diff --git a/IRaCIS.Core.Application/Service/Common/TrialImageDownloadService.cs b/IRaCIS.Core.Application/Service/Common/TrialImageDownloadService.cs
index ad5f60980..9f89c14c3 100644
--- a/IRaCIS.Core.Application/Service/Common/TrialImageDownloadService.cs
+++ b/IRaCIS.Core.Application/Service/Common/TrialImageDownloadService.cs
@@ -326,7 +326,7 @@ namespace IRaCIS.Core.Application.Service
                         {
                             var dirDic = new Dictionary<string, string>();
 
-                            var studyFolderName = $"{studyInfo.StudyCode}_{studyInfo.StudyTime:yyyy-MM-dd}_{string.Join('_', studyInfo.SeriesList.Select(t => t.Modality))}";
+                            var studyFolderName = $"{studyInfo.StudyCode}_{studyInfo.StudyTime:yyyy-MM-dd}_{string.Join('_', studyInfo.SeriesList.Select(t => t.Modality).Distinct())}";
 
                             #region DICOMDIR