diff --git a/invesalius/constants.py b/invesalius/constants.py
index 908aead..4509f9e 100644
--- a/invesalius/constants.py
+++ b/invesalius/constants.py
@@ -252,4 +252,4 @@ IMAGE_TILING = {"1 x 1":(1,1), "1 x 2":(1,2),
                 "4 x 3":(4,3), "4 x 4":(4,4),
                 "4 x 5":(4,5), "5 x 4":(5,4)}
 
-
+VTK_WARNING = 0
diff --git a/invesalius/reader/dicom_reader.py b/invesalius/reader/dicom_reader.py
index fe805b0..d82622b 100644
--- a/invesalius/reader/dicom_reader.py
+++ b/invesalius/reader/dicom_reader.py
@@ -36,7 +36,6 @@ import data.imagedata_utils as iu
 def ReadDicomGroup(dir_):
     
     patient_group = GetDicomGroups(dir_)
-    
     if len(patient_group) > 0:
         filelist, dicom, zspacing = SelectLargerDicomGroup(patient_group)
         filelist = SortFiles(filelist, dicom)
@@ -144,6 +143,13 @@ class ProgressDicomReader:
         ps.Publisher().sendMessage("End dicom load", grouper)
 
     def GetDicomGroups(self, path, recursive):
+        
+        if not const.VTK_WARNING:
+            fow = vtk.vtkFileOutputWindow()
+            #fow.SetFileName('c:\\vtkoutput.txt')
+            ow = vtk.vtkOutputWindow()
+            ow.SetInstance(fow)
+        
         y = yGetDicomGroups(path, recursive)
         for value_progress in y:
             if not self.running:
--
libgit2 0.21.2