[vtkusers] calculating a point coordinates

[lydia many]

Hello everybody
I have the following problem
I want to view an image (vtkimagedata), to click on a location of this image 
(x,y).
I used vtkinteractorstyleuser to get the coordinates of the point on the 
window of the viewer
How can I get the corresponding values in the imagedata.??
Thanks to reply


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