Hi all,<br><br>I'm currently working on deformable registration of CT images. I'm using cross-correlation (DeformableRegistration6.cxx) and mutual information (DeformableRegistration15.cxx) metrics with a B-Spline Deformable Transform in a 300*208*241 3D image. <br>
<br>It seems that the example DeformableRegistration15.cxx works much faster than example DeformableRegistration6.cxx. I guess example DeformableRegistration6.cxx is time consuming since it is performed on the whole image. And the Mattes Mutual Information metric works faster because it allows to take samples (SetNumberOfSpatialSamples) in the image instead of taking all voxels. So, I am wondering is there way to do the same thing in the cross-correlation metric to make it faster?<br>
<br>Thank you very much for your reply.<br><br><br>Best Regards,<br><br><br>Jian<br>