Study of scintillation properties and performance of CsI(Tl) detectors over time

García-Jiménez, G.; Cabanelas, P.; González-Caamaño, D.; Alvarez-Pol, H.; Vicente-Pardal, M.A.; Benlliure, J.; Cederkäll, J.; Cortina-Gil, D.; Feijoo-Fontán, M.; Graña-González, A.; Rodríguez-Sánchez, J.L.

doi:10.1016/j.nima.2023.169003

Cited by 1 publication

(1 citation statement)

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“…Its decay time constant (0.6-0.9 µs) can be inadequate for high photon counting X-ray imaging applications [6], whereas, even when doped with Tl ions, it remains a hygroscopic scintillator. The latter deteriorates its applications in high humidity conditions [7,8]. Moreover, CsI:Tl exhibits high levels of afterglow in its scintillation decay that produces image blurring in high-speed imaging applications [9].…”

Section: Introductionmentioning

confidence: 99%

Novel Detector Configurations in Cone-Beam CT Systems: A Simulation Study

Karali,

Michail,

Fountos

et al. 2024

Crystals

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Cone-beam computed tomography (CBCT) has emerged in recent years as an adequate alternative to mammography and tomosynthesis due to the several advantages over traditional mammography, including its ability to provide 3D images, its reduced radiation dose, and its ability to image dense breasts more effectively and conduct more effective breast compressions, etc. Furthermore, CBCT is capable of providing images with high sensitivity and specificity, allowing a more accurate evaluation, even of dense breasts, where mammography and tomosynthesis may lead to a false diagnosis. Clinical and experimental CBCT systems rely on cesium iodine (CsI:Tl) scintillators for X-ray energy conversion. This study comprises an investigation among different novel CBCT detector technologies, consisting either of scintillators (BGO, LSO:Ce, LYSO:Ce, LuAG:Ce, CaF2:Eu, LaBr3:Ce) or semiconductors (Silicon, CZT) in order to define the optimum detector design for a future experimental setup, dedicated to breast imaging. For this purpose, a micro-CBCT system was adapted, using GATE v9.2.1, consisting of the aforementioned various detection schemes. Two phantom configurations were selected: (a) an aluminum capillary positioned at the center of the field of view in order to calculate the system’s spatial resolution and (b) a breast phantom consisting of spheres of different materials, such that their characteristics are close to the breast composition. Breast phantom contrast-to-noise ratios (CNRs) were extracted from the phantom’s tomographic images. The images were reconstructed with filtered back projection (FBP) and ordered subsets expectation-maximization (OSEM) algorithms. The semiconductors acted satisfactorily in low-density matter, while LYSO:Ce, LaBr3:Ce, and LuAG:Ce presented adequate CNRs for all the different spheres’ densities. The energy converters that are presented in this study were evaluated for their performance against the standard CsI:Tl crystal.

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