[vtkusers] vtkImageWeightedSum and registering data

[Scott Johnson]

Hello Jothy,

 

I hadn't seen the example, but that is what I am doing to sum the
images.  My problem is the registration of the image volumes prior to
summing.  David sent me a suggestion but I haven't had a chance to try
it yet.

 

vtkImageWeightedSum and vtkImageMathematics perform a voxel by voxel
sum.  I need to perform a spatial summing because the structures in my
image volumes have moved.

 

Thanks

 

                                -- Scott

 

From: Jothybasu K Selvaraj [mailto:jothybasu at gmail.com] 
Sent: Saturday, April 10, 2010 7:25 AM
To: Scott Johnson
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] vtkImageWeightedSum and registering data

 

Have you seen this example

http://www.itk.org/Wiki/VTK/Examples/Python/SumVTKImages

Jothy

On Fri, Apr 9, 2010 at 9:58 PM, Scott Johnson
<Scott.Johnson at neuwave.com> wrote:

Hello,

 

I'm using vtk 5.4.2 on a windows platform.

 

I've got a number of DICOM series which are being read by
vtkDICOMImageReaders.  Now I need to register them and average the pixel
values.  For now I'm just adding translations to the origins and
connecting them to a vtkImageWeightedSum object.  The issue is that my
translations don't seem to have an effect.

 

I've tried connecting the vtkDICOMImageReader ->
vtkImageChangeInformation -> vtkImageWeightedSum and
vtkDICOMImageReader->vtkImageReslice->vtkImageWeightedSum.  Neither of
which worked. 

 

Looking at the source code for vtkImageWeightedSum, I guess it makes
sense because it is doing a voxel by voxel summing and not taking the
spatial location of the pixels into account.

 

Is there a way to do this in vtk or do I need to incorporate some itk?

 

Thanks

 

                                -- Scott

 


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