[Insight-users] register two volumes of different types

[Vincent A. Magnotta]

Grace,

Without having additional information, my guess is that the if the DTI
image is the moving image it is moving completely outside of the space
defined by the T1 weighted scan. I have been using this type of rigid
transform to co-register the same type of data (T1 and DTI) and have not
had any problems. I do initialize the transform with a
CenteredTransformInitializer and set the MomentsOn for the
initialization. Another potential problem could be the translation scale
value used for the registration. I hope that this helps.

Vince



On Thu, 2005-12-01 at 09:59, Grace Chen wrote:
> Hi George, 
>  
> Thanx for your reply. What makes my program a bit challenging is the
> fact that I am trying to register two volumes of different types (one
> is T1 weighted image and the other is diffusion weighted image).  They
> have different physical dimensions, different number of slices, and
> the way the data looks is quite different too.  My ITK program used to
> work for the volumes of the same time, but now I try to run it with
> two volumes of different types, it gives me segamentation fault.  Do
> you know why?
>  
> Grace
>  
>  
>         ----- Original Message ----- 
>         From: Li, George (NIH/NCI)
>         To: Grace Chen
>         Sent: Thursday, December 01, 2005 7:58 AM
>         Subject: RE: [Insight-users] register two volumes of different
>         types
>         
>         Grace:
>          
>         It does not have any restriction on the dimension of the two
>         image volumes.
>          
>         George
>          
>          
>         George G. Li, Ph.D.
>         ligeorge at mail.nih.gov
>         Office: (301)451-8955
>         _____________________________________________
>          
>         Radiation Oncology Branch
>         National Cancer Institute, NIH
>         Bldg 10, CRC, Rm B2-3561
>         10 Center Drive, MSC-1682
>         Bethesda, MD 20892, USA
>                 -----Original Message-----
>                 From: Grace Chen [mailto:Grace.Chen at swri.ca] 
>                 Sent: Wednesday, November 30, 2005 4:58 PM
>                 To: insight-users at itk.org
>                 Subject: [Insight-users] register two volumes of
>                 different types
>                 
>                 
>                 Hi there,  Good day!
>                  
>                 I have two 3D image data I want to register.  The
>                 movement in the data is 3D rigid.  So, I use
>                 VersorRigid3DTransform.  The two volumes are different
>                 types of image data (one is T1 image, and the other
>                 is diffusion weighted image), so I use
>                 MattesMutualInformationImageToImageMetric. I know ITK
>                 can register two volumes of different physical
>                 dimension.  But doesn't it also register two
>                 volumes that have different number of slices?  My
>                 program doesn't work for two volumes of different
>                 types, am I missing something?
>                  
>                 Grace  
> 
> 
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-- 
Assistant Professor
Department of Radiology
0453-D JCP
200 Hawkins Drive
Iowa City, IA 52242
E-mail: vincent-magnotta at uiowa.edu
Phone: 319-356-8255
Fax: 319-353-6275
Website: http://www.radiology.uiowa.edu