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<DIV><FONT face=Arial size=2>Hi everyone</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I am using the MultiResMiRegistration
framework in order to registrate 2 medical studies (a CT study and a MR
study).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>
<DIV>The InsightApplications software offers an application using these
components.</DIV></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2> * In particular, it uses the ITK registration
framework with<BR> * the following combination of
components:</FONT></DIV><FONT face=Arial size=2>
<DIV><BR> * -
MutualInformationImageToImageMetric<BR> * -
QuaternionRigidTransform<BR> * -
QuaternionRigidTransformGradientDescentOptimizer<BR> * -
LinearInterpolateImageFunction</DIV>
<DIV> </DIV>
<DIV>This application has the next parameters to configure:</DIV>
<DIV> </DIV>
<DIV> moving image initial shrink factors</DIV>
<DIV> fixed image initial shrink
factors </DIV>
<DIV> optimizer number of iterations</DIV>
<DIV> number of multiresolution
levels </DIV>
<DIV> learning rates per level</DIV>
<DIV> translation scales</DIV>
<DIV> </DIV>
<DIV>And, finally, these are the set of values I use for them:</DIV>
<DIV> </DIV>
<DIV>
<DIV> moving image initial shrink
factors (4,4,1)</DIV>
<DIV> fixed image initial shrink
factors (4,4,1)</DIV>
<DIV> optimizer number of
iterations
(2500)</DIV>
<DIV> number of multiresolution
levels 3,4 or 5</DIV>
<DIV> learning rates per
level
1e-03 1e-04 1e-05 1e-06 1e-07, ...</DIV>
<DIV> translation
scales
around 320 (1 or 2 orders lower and higher)</DIV>
<DIV> </DIV>
<DIV> The set of studies I'm working with, has the next
parameters (or similar):</DIV>
<DIV> </DIV>
<DIV> CT Dimensions: 512 x 512 x 105 (x,y,number of
slices)</DIV>
<DIV> CT Resolutions: 0.7 x 0.7 x 1.25 (x,y,z)</DIV>
<DIV> </DIV></DIV>
<DIV> MR Dimensions: 256 x 256 x 120 (x,y,number of
slices)
<DIV> MR Resolutions: 0.9 x 0.9 x 1.4 (x,y,z)</DIV></DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> I have made a lot of combinatios with the registration
values described above but the registration still remains very,
very inexact!!</DIV>
<DIV> </DIV>
<DIV>Could anyone help me? Do I have to configure any other parameters
inside the ITK code?</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>Thank you very much in advance.</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>José.</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV><BR> </DIV></FONT></BODY></HTML>