On the equivalence of image-based dual-energy CT methods for the determination of electron density and effective atomic number in radiotherapy
On the equivalence of image-based dual-energy CT methods for the determination of electron density and effective atomic number in radiotherapy
Möhler, C.; Wohlfahrt, P.; Richter, C.; Greilich, S.
Dual-energy computed tomography enables the determination of relative electron density and effective atomic number. As this can increase accuracy in radiotherapy treatment planning, a substantial number of algorithms for the determination of the two quantities has been suggested – most of them based on reconstructed CT images. We show that many of these methods share a common theoretical framework. Equations can be transformed from one method to the other by re-definition of the calibration parameters. We suggest that further work should be spent on practical calibration and the reliability of CT numbers rather than on the theoretical framework.
Keywords: Material Characterization; Radiotherapy; Treatment planning; Dose calculation; Proton and Ion Beam Therapy
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Physics and Imaging in Radiation Oncology 5(2018), 108-110
DOI: 10.1016/j.phro.2018.03.003
ISSN: 2405-6316
Cited 10 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-25448