Abstract
Columnar structured cesium iodide (CsI) scintillators doped with Thallium (Tl) have been used extensively for indirect X-ray imaging detectors. Here, theoretical modeling was performed to assess the impact of CsI thickness on optimal acquisition spectra for dual-energy iodine-enhanced breast computed tomography (bCT). Contrast-to-noise ratio (CNR) between iodine-enhanced and non-enhanced breast tissue normalized to the square root of the total average glandular dose (AGD) was computed as a function of the fraction of the AGD allocated to the low-energy images. Peak CNR/√AGD and optimal low-energy AGD allocations were identified for small, average and large uncompressed breasts. Optimal high-energy spectra were found to be almost independent of CsI thickness and occurred just above the Cs and I K-edges (range 34 to 36 keV), while optimal low-energy spectra varied largely with CsI thickness, ranging from 25 keV to 33 keV for 100 μm to infinite CsI scintillator thicknesses.
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de Carvalho, P.M., Carton, AK., Saab-Puong, S., Iordache, R., Muller, S. (2014). Optimization of X-Ray Spectra for Dual-Energy Contrast-Enhanced Breast Imaging: Dependency on CsI Detector Scintillator Thickness. In: Fujita, H., Hara, T., Muramatsu, C. (eds) Breast Imaging. IWDM 2014. Lecture Notes in Computer Science, vol 8539. Springer, Cham. https://doi.org/10.1007/978-3-319-07887-8_14
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DOI: https://doi.org/10.1007/978-3-319-07887-8_14
Publisher Name: Springer, Cham
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