[vtkusers] Can we select the specific region of a Image

[Pratheek Arora]

Hi friends
   I have one problem, 
   I have open a image one raw Image dataset, Know I have to select some
speciic region of Intrest (ROI) of Image, My prblem is
 1) How can I select ROI of intrest with in the Image or which Vtk class I
used for this.
 2) at run time Can I specified the coordinate at run time
 3) Can I draw a rectangle of specific region
I am using the VtkImageviewer for displaying the image
thanks
With regards
prateek
   

PRATEEK ARORA
Wipro GE Medical Systems
John F Welch Technology Centre
Export Promotion Industrial Park,
Plot 122, Phase-2, Whitefield Road
Bangalore: 560066. 
phone 8412050 - 3178