About principles on generating DRR

[fanyigao]

Hello! your work is brilliant! But I am confused about princples on on generating DRRs, could you tell me more about it? I remember a paper in itk website focused on it ,maybe published in 2010, but I cannot find it on itk website now.

[github-actions[bot]]

Thank you for contributing an issue! 🙏

Welcome to the ITK community! 🤗👋☀️

We are glad you are here and appreciate your contribution. Please keep in mind our community participation guidelines. 📜 Also, please check existing open issues and consider discussion on the ITK Discourse. 📖

[SimonRit]

DRR is the discretization of the x-ray transform, i.e., line integrals. There are several solutions to do it, e.g., https://aapm.onlinelibrary.wiley.com/doi/pdf/10.1118/1.595715 or, the implemented version in ITK, https://ieeexplore.ieee.org/document/4307572. I'm not aware of such an ITK article, maybe https://doi.org/10.54294/6f280b? It doesn't seem to contain an article... Maybe youvcan continue the discussion on discourse.itk.org, it does not seem to be a real issue in ITK.

[fanyigao]

DRR is the discretization of the x-ray transform, i.e., line integrals. There are several solutions to do it, e.g., https://aapm.onlinelibrary.wiley.com/doi/pdf/10.1118/1.595715 or, the implemented version in ITK, https://ieeexplore.ieee.org/document/4307572. I'm not aware of such an ITK article, maybe https://doi.org/10.54294/6f280b? It doesn't seem to contain an article... Maybe youvcan continue the discussion on discourse.itk.org, it does not seem to be a real issue in ITK.

Thanks for replying，you have already solved the problem for me!

[fanyigao]

DRR is the discretization of the x-ray transform, i.e., line integrals. There are several solutions to do it, e.g., https://aapm.onlinelibrary.wiley.com/doi/pdf/10.1118/1.595715 or, the implemented version in ITK, https://ieeexplore.ieee.org/document/4307572. I'm not aware of such an ITK article, maybe https://doi.org/10.54294/6f280b? It doesn't seem to contain an article... Maybe youvcan continue the discussion on discourse.itk.org, it does not seem to be a real issue in ITK.

Hello！I want to verify if the example given bellow https://github.com/InsightSoftwareConsortium/ITK/blob/master/Examples/Filtering/DigitallyReconstructedRadiograph1.cxx use joseph's method to generate drrs?

[SimonRit]

I think it does do a bilinear interpolation along each intersecting plane in the main direction of each ray which is Joseph's method to generate DRRs as far as my knowledge goes. Code is in itkRayCastInterpolateImageFunction.hxx if you want to check.

[fanyigao]

Thanks, I will read the code.