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Detector-unit-dependent calibration for polychromatic projections of rock core CT
Mengfei Li1,2,3, Yunsong Zhao1,2, Peng Zhang1,2
1School of Mathematical Sciences, Capital Normal University, Beijing, China.
Abstract:
Computed tomography (CT) plays an important role in digital rock analysis, which is a new prospective technique for oil and gas industry. But the artifacts in CT images will influence the accuracy of the digital rock model. In this study, we proposed and demonstrated a novel method to restore detector-unit-dependent functions for polychromatic projection calibration by scanning some simple shaped reference samples. As long as the attenuation coefficients of the reference samples are similar to the scanned object, the size or position is not needed to be exactly known. Both simulated and real data were used to verify the proposed method. The results showed that the new method reduced both beam hardening artifacts and ring artifacts effectively. Moreover, the method appeared to be quite robust.
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