Filtered back-projection and more images

[vegarant]

Hi,

It seems like the matrix systemMatrix provided in proMatrix_64.mat does only contain the forward transform. Applying it's transpose does (of course) not give the filtered back-projection. This means that I am unable to map inputf to input (where both variables are provided in testimg.mat)

Could you give some guidance on which implementation of the filtered back-projection you are using, or include it's matrix.

I'm interested in the robustness of the algorithm. Could you also provide some extra images. One test image is somewhat sparse.