[Rtk-users] Reconstruction Artifact

[Benjamin W. Maloney]

Hi all,

Not sure if this is the right group to post to but here's my question:

I have a code that pulls in my own projection images and uses the FDKConeBeamReconstructionFilter for reconstruction

The reconstruction I am getting has an artifact where it looks like there are two overlapping objects rotated. 
I have used other reconstruction toolboxes (mainly TIGRE in MATLAB) with the similar geometry inputs and not had this issue. I suspect the difference is in the parts of the geometry that are set by default. My question is if anyone has seen this before and what input I should look into?

I have a few more questions I may or may not be related:
1. I assume that since I set the origin etc of my images in pixel, sid and sdd should be in pixels as well? 
2. Are there restrictions related the scalar values of the projection data? My data will be in detector counts rather than linear attenuation coefficients, is that okay?
I have attached an image to show this issue. It is supposed to be a rectangular mammography phantom. It is a slice in XZ plane

Thanks for the help!
Ben



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