[Rtk-users] SIRT Reconstruction

[Lotte Schyns]

Hello,

We are having problems with the SIRT reconstructions. They seem very 
strange and blurry. However, other reconstructions (SART, FDK, 
iterativeFDK) look perfect. I uploaded an example of a SART and a SIRT 
reconstruction (same parameters) to 
https://www.dropbox.com/sh/7a4bkyjg43zjmy7/AAAp4tJrk9HedMEEuIKsGYDSa?dl=0. 
I also uploaded a minimalistic version of the code that I used (the 
paths in CMakeLists.txt probably need to be adapted to your system). You 
can alternate between SART and SIRT by changing line 143. The raw data 
is also available on dropbox. I didn't use 
rtkXRadRawToAttenuationImageFilter, because our projections are already 
corrected for the dark field and flood field, so 
(signal-dark)/(flood-dark). I just take the natural logarithm and 
multiply by -1. Do you know what could be the problem with the SIRT 
reconstructions? Are we using wrong parameters? Thanks for your time.

Lotte