<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">I have been using the <a href="http://www.vtk.org/Wiki/VTK/Examples/Cxx/IO/ReadDICOMSeries" class="">http://www.vtk.org/Wiki/VTK/Examples/Cxx/IO/ReadDICOMSeries</a> example to read a CT series. I have also been using the vtkGDCMPolyDataReader to read in structures from DICOM file. I would like to take the 2D slices from the polydata (effectively contours) and overlay them on the respective CT slice. I wondered if anyone can provide guidance on how to do this? I have tried multiple things, such as vtkPolyDataMapper2D, vtkActor2D etc, but not really making much progress. </div><div class=""><br class=""></div><div class="">Regards, Nick.</div></body></html>