30 March 2016 Optimizing the CsI thickness for chest dual-shot dual-energy detectors
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Abstract
Dual-energy imaging method has been introduced to improve conspicuity of abnormalities in radiographs. The method typically uses the fast kilovoltage-switching approach, which acquires low and high-energy projections in successive x-ray exposures with the same detector. However, it is typically known that there exists an optimal detector thickness regarding specific imaging tasks or energies used. In this study, the dual-energy detectability has been theoretically addressed for various combinations of detector thicknesses for low and high-energy spectra using the cascaded-systems analysis. Cesium iodide (CsI) is accounted for the x-ray converter in the hypothetical detector. The simple prewhitening model shows that a larger CsI thickness (250 mg cm-2 for example) would be preferred to the the typical CsI thickness of 200 mg cm-2 for better detectability. On the other hand, the typical CsI thickness is acceptable for the prewhitening model considering human-eye filter. The theoretical strategy performed in this study will be useful for a better design of detectors for dual-energy imaging.
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Dong Woon Kim, Dong Woon Kim, Junwoo Kim, Junwoo Kim, Hanbean Youn, Hanbean Youn, Hosang Jeon, Hosang Jeon, Ho Kyung Kim, Ho Kyung Kim, "Optimizing the CsI thickness for chest dual-shot dual-energy detectors", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97833U (30 March 2016); doi: 10.1117/12.2216716; https://doi.org/10.1117/12.2216716
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