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Hi Naved,<br>
<br>
The ConstantImageSource filter generates an image with all pixels
set to the same value (default value is 0), out of nothing. It does
noes need an input. In fact, it cannot take an input. <br>
I do not know MITK, but mitk::CastToItkImage seems like a method
that should return something. Something like a pointer to the image,
cast as ITK image. You probably need to get this pointer and set it
as input 1 of the FDK filter.<br>
<br>
Something like this, assuming there is something called ImageType in
mitk :<br>
<br>
mitk::ImageType::Pointer castImagePointer =
mitk::CastToItkImage(image, Img3DFloat);<br>
f->SetInput( 1, castImagePointer );<br>
<br>
<br>
Note that circumventing the rtk::ProjectionsReader filter in such a
way is usually a bad idea: before they can be back projected,
projections usually need a lot of pre-processing, which is performed
in the projections reader (like log-transform, LUT, parker weighting
for short scans, offset-detector weighting, scatter correction,
etc...).<br>
<br>
Hope it helps,<br>
Cyril<br>
<br>
<div class="moz-cite-prefix">On 03/18/2016 06:55 PM, naved chaudhri
wrote:<br>
</div>
<blockquote
cite="mid:CAL8PHjmry3xO=Xz-=se-4jy7SpqmwKw6p3BonOFbuxH6D7uVyg@mail.gmail.com"
type="cite">
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<div>
<div>
<div>Hi,<br>
<br>
</div>
I'm integrating RTK in an application that reads the raw
projections from a dicom file. After reading dicom I have
the data as itk::image object. At this point, I am facing
difficulty in finding a way to assign the itk::image to
rtk::ConstantImageSource or rtk::ProjectionsReader or not
getting the way to rtk::FDKConeBeamReconstructionFilter
for the reconstruction.<br>
<br>
</div>
<div>All the application examples I went through were
projections as stack based. <br>
</div>
<div><br>
</div>
<div>Following are few lines I have written.<br>
</div>
<div>//<br>
typedef itk::Image<float, 3> InImageType;<br>
InImageType::Pointer Img3DFloat = InImageType::New();<br>
<br>
</div>
<div>mitk::CastToItkImage(image, Img3DFloat); //Works (I use
MITK for reading and visualization)<br>
</div>
<div><br>
typename ConstantImageSourceType::Pointer iFilter =
ConstantImageSourceType::New();<br>
//iFilter->SetInformationFromImage( Img3DFloat ); // No
compilation error but Empty Reconstruction<br>
iFilter->SetInput(Img3DFloat ); //Compilation Error<br>
<br>
CbctGenerator.cpp:1338: error: no matching function for
call to 'rtk::ConstantImageSource<itk::Image<float,
3u> >::SetInput(itk::Image<float,
3u>::Pointer&)'<br>
iFilter->SetInput(Img3DFloat ); // produces
compilation error<br>
^<br>
//<br>
<br>
</div>
<div>Thanks in advance for any hint.<br>
</div>
<br>
</div>
Bests,<br>
<br>
</div>
Naved<br>
<div>
<div>
<div><br>
</div>
</div>
</div>
</div>
<br>
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