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30 March 2016 Optimizing the CsI thickness for chest dual-shot dual-energy detectors
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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, Junwoo Kim, Hanbean Youn, Hosang Jeon, and 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);

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