The data analysis presented in paper, based on analysis sand concentration changes
during silo flow, allow to conduct only the quality comparison between X-ray and ECT
tomography systems. The results in both case of tomography systems show decreasing of
sand concentration in funnel area comparing to the initial stage. However in case of X-ray
system the sand concentration decreased is constant during silo flow and only size of funnel
is changing (area of funnel is increasing in function of time). In case of ECT tomography
decreasing of the sand concentration in funnel area displays continuous character (concentration
is decreasing in function of time). Such results (this different between X-ray and
ECT data) can be caused by increasing funnel area and influence this phenomena on ECT
image reconstruction. This fact will be investigated in the future work of data analysis
work.