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<DIV><FONT face=Arial>Hi,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I want to register two 3D CT datasets, which came from one
patient and were scanned at different time.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>the size of the two datasets both are: 512*512*32,
spacing: 1.36*1.36*5.0</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>The metric I use is:
MattesMutualInformationImageToImageMetric,</FONT></DIV>
<DIV><FONT face=Arial>The Transform is: VersorRigid3D</FONT></DIV>
<DIV><FONT face=Arial>The Optimizor:
VersorRigid3DTransformOptimizer</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>the paramaters are:</FONT></DIV>
<DIV><FONT face=Arial>METRIC:</FONT></DIV>
<DIV><FONT face=Arial> metric->SetNumberOfHistogramBins( 20
);<BR> metric->SetNumberOfSpatialSamples( 512*512*32 /
100);</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>OPTIMIZER</FONT></DIV>
<DIV><FONT face=Arial> optimizerScales[0] = 1.0;<BR>
optimizerScales[1] = 1.0;<BR> optimizerScales[2] = 1.0;<BR>
optimizerScales[3] = 1/100000;<BR> optimizerScales[4] =
1/100000;<BR> optimizerScales[5] = 1/100000;</FONT></DIV>
<DIV><FONT face=Arial> optimizer->SetScales( optimizerScales
);</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial> optimizer->SetMaximumStepLength( 0.2000 );
<BR> optimizer->SetMinimumStepLength( 0.0001 );</FONT></DIV>
<DIV><FONT face=Arial> optimizer->SetNumberOfIterations( 200
);<BR></FONT></DIV>
<DIV><FONT face=Arial>However, the result is not good. I do not intend to use
the MeanSquaresImageToImageMetric due to its slowness. The reason may be the
incorrect paramters. Could anybody tell me how to set the correct
parameters?</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Best regards</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV><FONT size=2>
<DIV><BR><FONT face=Arial size=3></FONT></DIV>
<DIV><BR> </FONT></DIV>
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