Two key issues, the beam hardening effect and the partial volume effect, which qualitatively analyze X-ray CT images, have been investigated in previous studies. Both factors always affect the assessment of the X-ray CT image. The objective of this study is to clarify the basic properties of X-ray CT data in the analysis of geomaterial properties. This paper deals with artifacts due to changing the power voltage of the X-ray tube and the partial volume effects caused by variation in the occupation ratio of soil particles in a voxel.
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