[Insight-users] DeformableRegistration8 with Normalized Mutual Information

[Serena Fabbri]

Hi All,

I am registering MRI and CT image and I use Normalized Mutual Information.
I am using DeformableRegistration8 (BSpline Tranformtion) and I have replaced in the code only the 
line about the metric.
So I have written:


 	const unsigned int numberOfParameters2 = transform->GetNumberOfParameters();

 	typedef MetricType::ScalesType ScalesType;
 	ScalesType scales( numberOfParameters2 );
 	scales.Fill( 0.0001 );
         metric->SetDerivativeStepLengthScales(scales);

 	MetricType::HistogramType::SizeType histogramSize;
 	histogramSize[0] = 25;
 	histogramSize[1] = 25;
 	metric->SetHistogramSize( histogramSize );

       optimizer->MaximizeOn();

the problem is the program seems blocked  as the observer associated to registration pipeline doesn't 
write anything.
Did i miss to write some instructions? any idea?
I appreciate any suggestion.

Thank you.

Serena.