@article{TANG2011, 
author = {Zhiwei TANG and Guangshu HU},
title = {Dual Energy CT Imaging in Cone-Beam Micro-CT for Improved Attenuation Coefficient Measurement},
year = {2011},
journal = {Tsinghua Science and Technology},
volume = {16},
number = {4},
pages = {352-357},
keywords = {micro-CT, cone-beam, linear attenuation coefficient, beam hardening, dual energy},
url = {https://www.sciopen.com/article/10.1016/S1007-0214(11)70051-7},
doi = {10.1016/S1007-0214(11)70051-7},
abstract = {In order to improve micro-CT’s capability of accurate quantification of linear attenuation coefficient μ, a dual energy method was developed to correct beam hardening artifacts caused by the polychromatic spectra of X-ray tubes. In this method, two sets of scans, taken at different energy levels, were combined to create a synthetic monochromatic image. A physical polychromatic model of μ in dual energy imaging was developed with an iterative method to solve the model for a few selected pixels. To find a high-speed and effective computing approach, the physics model was approximated by a polynomial function of the measured intensities. The method was tested on a PMMA-aluminum phantom and CaCl2 admixtures. The results show that streak and cupping artifacts are completely eliminated and that the measurement of the reconstructed attenuation coefficient μ is observed to be over 95% accurate.}
}