Thanks for the information.
To keep it simple I want to project forward a single slice which I load as a
DICOM file.
Now I want to compute the sinogram of that slice and write it in a new file.
I got a little confused about the ConstantImageSource which is used in the test
class. Do I need it to compute a sinogram or is just a replacement of a
itk::Image?
Here is my code so far:
const unsigned int Dimension = 2;
typedef float PixelType;
typedef itk::Image< PixelType, Dimension > ImageType;
…
(reading image by itk::ImageFileReader which works)
…
ImageType::Pointer inputImage = reader->GetOutput();
const unsigned int NumberOfProjectionImages = 1;
ImageType::Pointer outputImage = ImageType::New();
typedef rtk::JosephForwardProjectionImageFilter<ImageType, ImageType>
ForwardType;
ForwardType::Pointer forward = ForwardType::New();
forward->SetInput(1, inputImage);
forward->SetInput(0, outputImage);
forward->Update();
…
(writing output image into a file)
…
The problem is that I get some errors when I instantiate the forward-Filter.
The errors are like that one:
error C2784: "vnl_matrix<T> operator *(const vnl_diag_matrix<T> &,const
vnl_matrix<T> &)": template-Argument für "const vnl_diag_matrix<T> &" konnte
nicht von "vnl_matrix_fixed<T,4,4>" hergeleitet werden.
Maybe there is something wrong with the PixelType that i used?
If the forward projection works, which filter should i use to achieve a
filtered back projection without aliasing?
Many thanks in advance.
Tobias
Von: [email protected] [mailto:[email protected]] Im Auftrag von Simon Rit
Gesendet: Mittwoch, 4. Mai 2016 09:02
An: Tobias Stein <[email protected]>
Cc: [email protected]
Betreff: Re: [Rtk-users] forward and back projection - MITK
Dear Tobias,
The forward projection has 2 inputs:
- input 0: the stack of projections in which you wish to forward project,
- input 1: the volume you wish to forward project.
For the backprojection, it's exactly the same:
- input 0: the volume in which you wish to backproject,
- input 1: the stack of projections you wish to backproject.
Be aware that JosephBackProjectionImageFilter is the transpose of the forward
projection and will have some aliasing (see, e.g., De Man and Basu
<http://iopscience.iop.org/article/10.1088/0031-9155/49/11/024/meta;jsessionid=87B598ABFDC2AA07D1DED2DEE607F0E7.c2.iopscience.cld.iop.org>
to see what I mean).
I have personally never used MITK but don't hesitate to share your experience
on the mailing list.
Simon
On Wed, May 4, 2016 at 12:59 AM, Tobias Stein <[email protected]
<mailto:[email protected]> > wrote:
Hi all,
i want to use the forward and backward projection to reduce metal artefacts in
ct images. I’ve seen so far that I may use the
JosephForwardProjectionImageFilter to perform the forward projection. I’ve also
seen the test for this class but I don’t get it, where should i put my 2D slice
as input to execute the transformation. About the back transformation with the
JosephBackProjectionImageFilter I also need more information how I can use it
to transform a sinogram back to a ct slice. There is a test at the
documentation, but the link is missing there.
I’ve got another independent question.
Are some of you familiar with MITK and know how to get the superbuild up and
running with RTK? I am writing a MITK-Plugin and want to reduce the metal
artifacts before a segmentation. So if some of you have experience with the
combination of RTK and MITK it would be nice if you will share it ;)
Best regards,
Tobias
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