[Rtk-users] Sophia beads reconstruction

[Simon Rit]

Hi,
I quickly checked SophiaBeads_64_averaged.zip. First, it seems that what is
provided is directly the line integral. RTK will process the tif images as
if it were a photon count so I converted the tif projections to mha to
avoid this. For the conversion, I used another piece of software but you
can easily do the same thing with SimpleRTK.
Second, I used the enclosed script which gives me a much better result. I
have however a geometry problem. I think they provide a Matlab piece of
code to get the center of rotation. If you can run it and find out what is
this center, then you can use it to configure the geometry better with the
options --proj_iso_x and --proj_iso_y.
Good luck,
Simon

On Tue, Jan 19, 2016 at 8:02 PM, MG Vallet <mgvallet.pro at gmail.com> wrote:

> Thanks Cyril!
> going to carefully check my inputs and I give you some news.
> mgv
>
> 2016-01-19 10:33 GMT-05:00 Cyril Mory <cyril.mory at uclouvain.be>:
>
>> Hi,
>>
>> It looks like the geometry is wrong indeed, because I have never seen
>> such artifacts.
>>
>> Hope that helps,
>> Cyril
>>
>>
>> Le 19/01/2016 16:19, MG Vallet a écrit :
>>
>> Dear rtk-users,
>>
>> I applied the FDKConeBeamReconstructionFilter to a data set from
>> <https://zenodo.org/record/16539>https://zenodo.org/record/16539.
>> This is a plastic tube filled with glass beads that has been scanned.
>>
>> Attached is a view of the reconstructed central slice. It is found that:
>>
>>    1. the beads are quickly deformed outside the center
>>    2. each one has a halo, or a shadow (dont know the proper term)
>>
>> My question is if these are simply expected artifacts. I am not 100%
>> sure I properly set the geometry parameters.
>>
>> Regards,
>> mgv
>>
>>
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>>
>>
>>
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>
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