[Rtk-users] using RTK with python

[나윤호]

Before I run the script, I installed itk and itk-rtk using pip.
and then I copied and pasted the whole script in FirstReconstruction.py
in a jupyter notebook cell.
Do I need any additional installation to use rtk?

Thank you for your answer of second question.

2020년 4월 21일 (화) 오후 5:27, Aurélien Coussat <
aurelien.coussat at creatis.insa-lyon.fr>님이 작성:

> On Tue, 2020-04-21 at 17:15 +0900, 나윤호 wrote:
>
> Thank you for replying.
>
> I'm pretty sure that I haven't changed anything in the example script.
> What I just did is copy and paste and run it.
>
>
> What process did you follow in order to run it? Are you running it from a
> shell command line (as in "python FirstReconstruction.py") or from a Python
> command line (running "python" then copy-pasting everything) ? Could you
> provide the exact steps you followed in order to reproduce the problem?
>
> and could you explain me how to translate(?) does documents into pythonic
> way?
> (I don't know much about Clang)
>
> for example, in the link you gave me it says
>
> *rtk::FDKConeBeamReconstructionFilter< TInputImage, TOutputImage,
> TFFTPrecision > Class Template Reference  *
>
> I empirically know that in python I have to type something like
>
> *rtk.FDKConeBeamReconstructionFilter[InputImage, OutputImage,
> FFTPrecision]*
>
> Am I right??
>
>
> Almost, but your intuition is correct! From
> rtkFDKConeBeamReconstructionFilter header file (
> http://www.openrtk.org/Doxygen/rtkFDKConeBeamReconstructionFilter_8h_source.html),
> you can see that default values are already provided for TOutputImage and
> TFFTPrecision. From Python's point of view only a single argument is
> therefore required (TInputImage). You can see an example of
> FDKConeBeamReconstructionFilter starting from the 65th line of
> FirstReconstruction.py.
>
> Good luck!
>
> Aurélien.
>
>
> 2020년 4월 21일 (화) 오후 4:58, Aurélien Coussat <
> aurelien.coussat at creatis.insa-lyon.fr>님이 작성:
>
> Hi,
>
> Your first error is really strange. The "geometry" variable is supposed to
> be typed as rtkThreeDCircularProjectionGeometry (defined line 14), while
> according to your error message it is of type
> rtkFDKConeBeamReconstructionFilter. Are you sure you haven't somehow
> altered the example script?
>
> About your second question, you can use rtkFDKConeBeamReconstructionFilter
> and provide it a parallel geometry. See the documentation for more details
> :
> http://www.openrtk.org/Doxygen/classrtk_1_1FDKConeBeamReconstructionFilter.html
> .
>
> Don't hesitate if something remains unclear!
>
> Aurélien.
>
> On Tue, 2020-04-21 at 12:06 +0900, 나윤호 wrote:
>
> Hi.
> I'm a newbie to ITK and RTK.
> I'm currently using python not C++
>
> so I installed ITK package and RTK package using
>
> pip install itk
> pip install itk-rtk
>
> using ITK seems OK,  but I'm having difficulties with RTK.
>
> When I run the ITK example code, It worked well.
> but when I tried to run the FirstReconstruction.py in the github,
> error occurrs.
>
> ---------------------------------------------------------------------------AttributeError                            Traceback (most recent call last)<ipython-input-1-be2ee9c70d3d> in <module>     19 for x in range(0,numberOfProjections):     20   angle = firstAngle + x * angularArc / numberOfProjections---> 21   geometry.AddProjection(sid,sdd,angle)     22      23 # Writing the geometry to disk
> AttributeError: 'rtkFDKConeBeamReconstructionFilterIF3' object has no attribute 'AddProjection'
>
>
>
> How can I fix this problem?
>
> and I have another question.
> I want the reconstruct the sinogram image to phantom.
>
> usually what I did was using skimage.transform.iradon().
> what should I use in RTK to do Inverse radon transform or Filtered back
> projection method?
>
>
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