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Syntactic foam sample tomography acquired at ESRF ID19, with energy of 19 keV and pixel size of 0.28 µm. (a) Filtered back-projection. (b) Correction with RCP technique, using the parameters 
= 60 and 
= 60. (c) Reconstruction with Total Variation technique, using the parameters 
= 0.35 and 
= 
. (d) Reconstruction with Dictionary Learning technique, using the parameters = 0.1, 
= 0.035 and 
= 20.
