Question: Is there a way to get 2D image of a 3D object at some angle

[jakubMitura14]

Hello I have 3d object composed of cylinders and I reconstruct it into 3d voxel array using filtered back projection.
Is there a way to get 8 2D images that are the projection of the 3D object on flat surface every 45 degrees?

• so I want to have eight 2 dimensional images instead of one 3 dimensional

[JeffFessler]

After you apply FBP you no longer have cylinders; you have voxels.
Then you need a discrete forward projector designed for voxels.
See JuliaImageRecon/Sinograms.jl#34 and the package(s) discussed there.

A related visualization is here that illustrates what I think you want:
https://juliaimagerecon.github.io/SPECTrecon.jl/stable/generated/examples/1-overview
But ImagePhantoms is not really the package for voxelized forward projection
(though it could be hacked with a huge grid of cubes).

[JeffFessler]

Converting to a discussion now BTW.