[Rtk-users] Help required - rtkFDK reconstruction
Simon Rit
simon.rit at creatis.insa-lyon.fr
Thu Nov 19 15:42:13 EST 2020
Hi,
Please use the mailing list (cc).
1. The raw format is not directly understandable I believe, you need to
have meta information passed, e.g. with a mhd. Since you know how to
convert your projection images to line integral (for rtkfdk), just use the
input of rtkfdk instead of using the rtk::ProjectionsReader.
2. The output of both rtk::CudaFDKConeBeamReconstructionFilter and
rtk::FDKConeBeamReconstructionFilter is mu if the input projections are
well pre-processed, i.e., if they contain the line integrals of mu.
Simon
On Thu, Nov 19, 2020 at 10:24 AM Febin P Alex <febin.p at panaceamedical.com>
wrote:
> Dear Simon,
>
>
> I'm using the RTK-C++ toolkit for our cbct reconstruction purpose and
> found it very helpful. I'm using the rtkFDK algorithm for reconstruction.
> Currently I'm a facing a couple of issues which are illustrated
>
> 1 . While going through the documentation, I have come across the use of
> water precorrection filter for cupping correction. It's said that we need
> to pass a set of coefficients for the filter to get activated.
> But we were not able to find a C++ test code detailing how to find
> the coefficients but rather got a python code in the below link.
>
> http://wiki.openrtk.org/index.php/WaterPreCorrection
>
> So I tried to run that python code with my data. I have around 330
> unsigned short projection in *.raw* format each of dimension 1536x1536
> pixels.
> Since python itk.Image doesn't have support for unsigned short I have
> converted the data to float and given as input to rtk.ProjectioReader
> class.
> But on execution, it is getting aborted at *fdkFilter.Update()*
> command without throwing any exception. Attaching the modified python code.
>
>
> 2. The second issue is , after the reconstruction I want to convert the
> reconstructed grey level values into CT numbers. For this I'm using the
> equation
>
> HU=1000×μ−μwaterμwater−μair, where
> μ is the linear attenuation coefficient of substance.
>
> M y doubt is whether the output from
> rtk::CudaFDKConeBeamReconstructionFilter is same as the μ defined above
> or any more conversion is required.
>
>
> Kindly request you to suggest me a solution.
>
> Thanks & Regards
> Febin P Alex
>
>
>
>
>
>
>
>
>
>
> <https://www.panaceamedical.com/ssl/>*PANACEA MEDICAL TECHNOLOGIES PVT
> LTD*
> *Web :* www.panaceamedical.com
> *Address :* Plot #35, Phase-IV, Malur Industrial Area, Kolar District,
> Karnataka, INDIA, PIN:563130
> *Location :* https://goo.gl/maps/doBkXNp3TRsUAqsc7
> <https://goo.gl/maps/doBkXNp3TRsUAqsc7http://>
> <https://www.facebook.com/PanaceaMedicalTechnologies/http://>
> <https://twitter.com/panacea_medical>
> <https://www.linkedin.com/company/panacea-medical-technology/>
> <https://www.youtube.com/channel/UCwJ1DoSac5FT6VLVR6TJQ-A>
>
> <https://www.panaceamedical.com/ssl/all-products.php>
> *EMAIL DISCLAIMER: *This communication (including any accompanying
> documents) is intended only for the use of the addressee(s) and contains
> information that is PRIVILEGED AND CONFIDENTIAL. Unauthorized reading,
> dissemination, distribution or copying of this communication is prohibited.
> If you have received this communication in error, please notify us
> immediately at pmtadmin at panaceamedical.com and promptly destroy the
> original communication and all copies taken thereof. Thank you for your
> cooperation. Communicating through email is not secure and capable of
> interception, corruption and delays. Anyone communicating with Panacea
> Medical Technologies Pvt Ltd by email accepts the risks involved and their
> consequences.
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20201119/dcf725c4/attachment-0001.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: noname
Type: image/png
Size: 513 bytes
Desc: not available
URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20201119/dcf725c4/attachment-0006.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: noname
Type: image/png
Size: 445 bytes
Desc: not available
URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20201119/dcf725c4/attachment-0007.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: noname
Type: image/png
Size: 493 bytes
Desc: not available
URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20201119/dcf725c4/attachment-0008.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: noname
Type: image/png
Size: 11844 bytes
Desc: not available
URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20201119/dcf725c4/attachment-0009.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: noname
Type: image/png
Size: 568 bytes
Desc: not available
URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20201119/dcf725c4/attachment-0010.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: noname
Type: image/png
Size: 83961 bytes
Desc: not available
URL: <https://public.kitware.com/pipermail/rtk-users/attachments/20201119/dcf725c4/attachment-0011.png>
More information about the Rtk-users
mailing list