<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Hello, <br><br> I am working with ITK at this moment. I have one question regarding the selection of fixed and moving images. Does it matter that which one is fixed and which one is moving. Are there any rules for that? I noticed normally the moving image will be interpolated. Thanks ! <br><br><br>sincerely <br><br>calvin <br></td></tr></table><br>