[Insight-users] Multi Modality Registration

[Luis Ibanez]

Hi Srivalli,

Your description was a bit confusing.


A) What run-time error did you got when
    initializing the transform with the
    CenteredTransformInitializer  ?
    What transform were you using at that moment ?



B) What do you mean by:

    "Image dimensions are changed to fixed dimensions" ?



C) When the output parameter are those of an identity
    matrix... how many iterations of the optimizer did
    you run  ?  It looks like the process was stopped
    prematurely.



D) When you say that the SPECT and MR are in Coronal/Axial,
    How are you obtaining this information ?
    If the registration process works fine when you *don't*
    use the OrientImageFilter... that probably indicates that
    the anatomical structures are not oriented differetly
    between the two images.


You can probably solve this by simply checking the images
using the ImageViewer in InsightApplications.  Open each
image in a different instance of the viewer and go through
the slices, to see if the anatomy is presented in the
same orientation or not.



Regards,



     Luis



----------------------
valli gummadi wrote:

> Hi All,
> 
> I am working on MR-SPECT Registratiom.My MR volume is in coronal orientationa and SPECT is in Axial view. SO, I changed MR to Axial view using ITKOrientImageFilter and registerd Axial mr with axial spect image. I tried to initilize transform with centered transform initializer. But, I am getting runtime error.so,Used identity transform as initial parameters for registration. After registration and resampling image dimensions are changed to fixed image dimensions but, the final parameters are identity matrix.When i try with original mr and spect i.e with out converting mr to axial , Registration process is quite ok. I mean with out any erros and matrix is not identity. But, Coronal view should be registered with 
> coronal view spect. Any more processing is required to register coronal MR 
> with coronal SPECt and Transverse MR with Transverse SPECT. Can anybody tell me the reason.Because, Asfaras i know MR images will be in coroanl view. 
> To register them with spect we have to change them to transverse view as spect images will be in tranverse.
> 
> Thanking You,
> Regards,
> Srivalli.