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<DIV><FONT face=Arial size=2>Dear all: </FONT></DIV>
<DIV><FONT face=Arial
size=2>
</FONT></DIV>
<DIV><FONT face=Arial
size=2> I want to
use vtkImageReslice to resample nonrigid transformed images, I have
serveral nonrigid transfromations, the transformation is represented by the
different displacement field.I use vtkImgedata to store them. every time, I use
SetDisplacementGrid function to change the grid transformation, then I update
the field data, update the </FONT><FONT face=Arial size=2>vtkGridTransform
object, and then the vtkImageReslice object. but when I change the field, the
resliced image </FONT><FONT face=Arial size=2>didn't change. it seems
vtkimagereslice didn't recalculate. I use the following method:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>vtkImageData *grid;</FONT></DIV>
<DIV><FONT face=Arial size=2>vtkGridTransform *Transform;</FONT></DIV>
<DIV><FONT face=Arial size=2>vtkImageReslice *reslice;</FONT></DIV>
<DIV><FONT face=Arial size=2>.....</FONT></DIV>
<DIV><FONT face=Arial size=2>for each displacement field</FONT></DIV>
<DIV><FONT face=Arial size=2>float
*disp=(float*)grid->GetScalarPointer();</FONT></DIV>
<DIV><FONT face=Arial size=2>/// set the displacement field to disp
pointer</FONT></DIV>
<DIV><FONT face=Arial size=2>grid->Update();</FONT></DIV>
<DIV><FONT face=Arial
size=2>Transform->SetDisplacementGrid(grid);</FONT></DIV>
<DIV><FONT face=Arial size=2>Transform->Update();</FONT></DIV>
<DIV><FONT face=Arial
size=2>reslice->SetResliceTransform(Transform);</FONT></DIV>
<DIV><FONT face=Arial size=2>reslice->Update();</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I think when I call
grid->update(),the modifytime of the grid will be remembered,
and when reslice calls his </FONT></DIV>
<DIV><FONT face=Arial size=2>reslice will know the grid have been updated and
recalculate reslice himself again, I don't know why this didn't
happen.</FONT><FONT face=Arial size=2>Can anyone give me any idea on this, I
dont' know whether there is a function I didn't call or is there any
</FONT></DIV>
<DIV><FONT face=Arial size=2>reason for this?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>zhang zhijun</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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