[Insight-users] Registration

[Luis Ibanez]

HI Srivalli,


Did you used the CenteredTransformInitializer   ?
 
http://www . itk . org/Doxygen/html/classitk_1_1CenteredTransformInitializer . html

As indicated in the SoftwareGuide
http://www . itk . org/ItkSoftwareGuide . pdf

in the section on Centered Transforms
Section 8.5.1, pdf-page 263.




Did you verified the pixel spacing of both images ?


Did you plot the output of the metric as the
                       optimization is progressing ?


The information in your message may not be enough to
give you any useful advice....


Regards,


    Luis


--------------
CSPL wrote:
> Hi All,
>  
> We are trying to perform registration.
>  
> Fixed volume is the extracted brain part of the original MR volume.
> Moving is the spect volume
>  
> Our requirement is to register extracted brain with spect and then fuse 
> the registered spect with the original MR so that spect fuses with the 
> brain and not with other tissues.
>  
> We are using following itk classes for registration and transform proces:
> 1. MultiResolutionImageRegistrationMethod
> 2.MattesMutualInformationImageToImageMetric
> 3.LinearInterpolateImageFunction
> 4.RecursiveMultiResolutionPyramidImageFilter
> 5.CenteredAffineTransform
> 6.RegularStepGradientDescentOptimizer
> 7.ResampleImageFilter
>  
> Input parameters for the above classes are:
> no of iterations = 200;
> TranslateScale = 1000;
> optimizer Scales = 1;
> Optimizer maximum step length = 0.1;
> Optimizer minimum step length = 0.01;
> SpatialSamples = 1000;
> Bins = 50;
> No of Levels = 3;
> SetMinimize = TRUE;
>  
> The fusion output is showing the spect fused with the lower part of the 
> MR brain and not exactly the brain tissue.
>  
> Can someone help us and let us know our mistake.
>  
> Regards,
> Srivalli