Hi, Sometimes rotating in the wrong direction gives this kind of artefacts. It's quite possible that we don't use the same convention as other toolkits regarding this. For other questions: 1. Yes, you can use pixel as the unit. Then the image spacing should be 1 obviously and indeed, sdd and sid should be in pixels. 2. I don't fully understand. If your data is the output of a count detector, then you either rely on RTK to guess the counts without object to compute the line integral, or your preprocess your projections to pass line integrals in a float format. Simon
On Tue, Jun 2, 2020 at 4:51 PM Benjamin W. Maloney < benjamin.w.maloney...@dartmouth.edu> wrote: > 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 > > > > _______________________________________________ > Rtk-users mailing list > Rtk-users@public.kitware.com > https://public.kitware.com/mailman/listinfo/rtk-users >
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