[Insight-users] Multi Modality Image Co Registration

[Luis Ibanez]

Hi Albert,


1) You can monitor the registration process by using Command/Observers
    that listen to the IterationEvents thrown by the Optimizer.


2) You may find useful as well the vtkRegistrationMonitor class that
    is available at

           InsightApplications/Auxiliary/vtk

    it generates surface renderings of the images being registered,
    as the registration progresses.



3) You can initialize the registration process with landmarks,
    by using the class

           itkLandmarkBasedTransformInitializer

    You will have to find the locations of the landmarks in both
    the CT and MRI images, and then pass the coordinates of the
    landmarks to the Initializer class.



4)  You can't view anything with ITK.   :-)

     ITK doesn't provide visualization capabilities.

     You may want to implement your visualization code using VTK.
     (or see item 5. below).


5)  If you want to verify the quality of the registration process,
     You may want to try VV:

          http://www.creatis.insa-lyon.fr/rio/vv

     or Slicer:

          http://www.slicer.org



    Regards,



       Luis



----------------
Albert King wrote:
> Hi Bill,
>  
> Thanks for the reply.Is there registration monitoring Mechanism in 
> ITK.How to set the landmarks on ct images so that corresponding 
> landmarks appear on MRI .I mean assume that I defined 4 landmarks on CT 
> images now i want to define the lanmarks on MRI corresponding to the 
> same slice as of ct .In order to check the accuracy of registration can 
> i view the landmark list by means of itk registration algorithms.Please Help
>  
> Regards
>  
> Albert
> 
> ------------------------------------------------------------------------
> *From:* Bill Lorensen <bill.lorensen at gmail.com>
> *To:* Albert King <albert.king84 at yahoo.com>
> *Cc:* Insight-Users <insight-users at itk.org>
> *Sent:* Tuesday, July 7, 2009 6:20:39 PM
> *Subject:* Re: [Insight-users] Multi Modality Image Co Registration
> 
> No. You do not need to perform an MPR. You may have to translate if
> they are not landmarked the same. By landmark, I mean the zero
> position they set in the exam. For instance in a head exam, they may
> landmark at the bridge of the nose.
> 
> On Tue, Jul 7, 2009 at 8:35 AM, Albert King<albert.king84 at yahoo.com 
> <mailto:albert.king84 at yahoo.com>> wrote:
>  > Hi Bill,
>  >
>  > Thanks for the reply, but radiologists tell that ct and mri scans are
>  > performed at different angluations and landmarks.In that case do I 
> have to
>  > perform a MPR on CT so as to match the landmark of MRI.
>  >
>  >
>  > Thanks and Regards
>  > Bill
>  >
>  > ________________________________
>  > From: Bill Lorensen <bill.lorensen at gmail.com 
> <mailto:bill.lorensen at gmail.com>>
>  > To: Albert King <albert.king84 at yahoo.com 
> <mailto:albert.king84 at yahoo.com>>
>  > Cc: insight-users at itk.org <mailto:insight-users at itk.org>
>  > Sent: Tuesday, July 7, 2009 5:48:56 PM
>  > Subject: Re: [Insight-users] Multi Modality Image Co Registration
>  >
>  > Albert,
>  >
>  > itk performs registration in physical space. For radiology data, the
>  > units are normally in mm's.
>  >
>  > If the CT and MR data were landmarked similarly, you should not have
>  > to modify either dataset. You do not have to resample or reorient
>  > either volume.
>  >
>  > That said, the picking of parameters can be tricky.
>  >
>  > Bill
>  >
>  > On Tue, Jul 7, 2009 at 8:11 AM, Albert King<albert.king84 at yahoo.com 
> <mailto:albert.king84 at yahoo.com>> wrote:
>  >> Hi All,
>  >>
>  >> I am trying to perform Image Co registration (fusion ) of CT and MRI 
> dicom
>  >> Images .Considering my registration as rigid registration (translation ,
>  >> rotation and scaling) I have fused a single slice of a CT amd MRI using
>  >> Image registration 8.cxx.I have the following Queries.
>  >>
>  >> CT data set is obtained from the scanner at a different angulation from
>  >> that
>  >> of MRI (i.e . the way we acquire CT data set is different and the way we
>  >> acquire MR data set is different).Do I have to perform Multi Planr
>  >> reformation of the CT datatset to match  the MRI angulation .
>  >> CT data set Matrix Size is of 512 x 512  and MRI data set Matrix Size is
>  >> 256
>  >> x 256.Do I have to rescale so as to avoid mis registration.
>  >> Choosing the right values of different parameters for satisfactory
>  >> registration is a tricky job.Is there any registration monitoring
>  >> mechanism
>  >> in ITK.
>  >>
>  >>
>  >>
>  >> Please Help.Thanks in Advance.
>  >>
>  >>
>  >>
>  >>
>  >>
>  >> Regards
>  >>
>  >>
>  >>
>  >> Albert
>  >>
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>  >>
>  >
>  >
> 
> 
> ------------------------------------------------------------------------
> 
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