Differences in reconstructed images

[rasad-hub]

Hello. I tried to reconstruct the sinogram matrix I got from resolusion-phantom through tigre algorithms and I am sure that I enter the settings of the parameters correctly, but the reconstructed image is different from the image I expect. The photo on the left is related to the same sinogram. And it is reconstructed by a simple command (iradon) and the image on the right is reconstructed by tigre algorithms. Can you guide me, where is the problem?

• MATLAB version:2023b
• OS:windows10
• CUDA version:11.8

[AnderBiguri]

The only guess I can give you is that you have set the geometry wrong somehow. It also seems that you have not log-transformed your projections either (on both cases).

[AnderBiguri]

yes, as I don't know if the angles match the measured data, or the geometry is right, it should match what the real thing is, which I don't know. Maybe try negating the angles, or other things.

[rasad-hub]

yes, as I don't know if the angles match the measured data, or the geometry is right, it should match what the real thing is, which I don't know. Maybe try negating the angles, or other things.

It is possible that this result is due to the tiger version or some mex files are not included during compilation?

[AnderBiguri]

@rasad-hub no, not at all. Both of your recons look wrong anyway, probably the log-transform, as I said. But TIGRE should work better than matlabs iradon.