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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear friends,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Greetings!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For applying ITK segmentation algorithm, interactive seed picking is needed. Thus the vtkSeedWidget and vtkPointHandleRepresentation2D are used to put landmarks on the 2D CT image. For navigation between different CT image slices, the vtkSliderRepresentation2D is utilized.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The problem is that the previous landmarks marked on a previous image slice also appear on the current slice. How to make the previously marked landmarks stay on that image slice only?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Any idea would be greatly appreciated!!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best regards,<o:p></o:p></p><p class=MsoNormal>Yang<o:p></o:p></p></div></body></html>