Browsing by Author "Auffray, Etiennette"

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    Data supporting 'Two-dimensional perovskite functionalized fiber-type heterostructured scintillators'
    (Cranfield University, 2023-02-22 12:04) Rogers, Edith; Danang Birowosuto, Muhammad; Maddalena, Francesco; Dujardin, Christophe; Pagano, Fiammetta; Kratochwil, Nicolaus; Auffray, Etiennette; george Krause, Philip; Bizarri, Gregory
    Data used to produce the article "Two-dimensional perovskite functionalized fibre-type heterostructured scintillators" Data used to create the 2D histograms of charge (fig 2) and the CTR plots (fig 3)
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    Design rules for time of flight Positron Emission Tomography (ToF-PET) heterostructure radiation detectors
    (Elsevier, 2022-06-27) Krause, Philip George; Rogers, Edith; Birowosuto, Muhammad Danang; Pei, Qibing; Auffray, Etiennette; Vasil'ev, Andrey N.; Bizarri, Gregory
    Despite the clinical acceptance of ToF-PET, there is still a gap between the technology's performance and the end-user's needs. Core to bridging this gap is the ability to develop radiation detectors combining a short attenuation length and a sub-nanosecond time response. Currently, the detector of choice, Lu2SiO5:Ce3+ single crystal, is not selected for its ability to answer the performance needs, but as a trade-off between requirements and availability. To bypass the current performance limitations, in particular restricted time response, the concept of the heterostructured detector has been proposed. The concept aims at splitting the scintillation mechanisms across two materials, one acting primarily as an absorber and one as an ultra-fast emitter. If the concept has attracted the interest of the medical and material communities, little has been shown in terms of the benefits/limitations of the approach. Based on Monte Carlo simulations, we present a survey of heterostructure performance versus detector design. The data allow for a clear understanding of the design/performance relationship. This, in turn, enables the establishment of design rules toward the development and optimization of heterostructured detectors that could supersede the current detector technology in the medical imaging field but also across multiple sectors (e.g. high-energy physics, security).
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    ItemOpen Access
    Fast emitting nanocomposites for high-resolution ToF-PET imaging based on multicomponent scintillators
    (Wiley, 2024-02-28) Orfano, Matteo; Pagano, Fiammetta; Mattei, Ilaria; Cova, Francesca; Secchi, Valeria; Bracco, Silvia; Rogers, Edith; Barbieri, Luca; Lorenzi, Roberto; Bizarri, Gregory; Auffray, Etiennette; Monguzzi, Angelo
    Time-of-Flight Positron Emission Tomography (ToF-PET) is a medical imaging technique, based on the detection of two back-to-back γ-photons generated from radiotracers injected into the body. Its limit is the ability of employed scintillation detectors to discriminate in time the arrival of γ-pairs, that is, the coincidence time resolution (CTR). A CTR < 50 ps will enable fast imaging with ultralow radiotracer dose. Monolithic materials do not have simultaneously the required high light output and fast emission characteristics, thus the concept of scintillating heterostructure is proposed, where the device is made of a dense scintillator coupled to a fast-emitting light material. Here a composite polymeric scintillator loaded with hafnium oxide nanoparticles is presented. This enhanced by +300% its scintillation yield, by surpassing commercial plastic scintillators. The nanocomposite is coupled to bismuth germanate oxide (BGO) realizing a multilayer metascintillator. The energy sharing between its components is observed, which activates the nanocomposite's fast emission enabling a net CTR improvement of 25% with respect to monolithic BGO. These results demonstrate that a controlled loading with dense nanomaterials is an excellent strategy to enhance the performance of polymeric scintillators for their use in advanced radiation detection and imaging technologies.
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    Simulation data for heterostructured scintillator development
    (Cranfield University, 2023-03-10 11:17) Bizarri, Gregory; Rogers, Edith; george Krause, Philip; Pei, Qibing; Auffray, Etiennette; Danang Birowosuto, Muhammad; Vasil’ev, Andrey
    Simulation datasets underlying the study 'Design rules for time of flight Positron Emission Tomography (ToF-PET) heterostructure radiation detectors'
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    Two-dimensional perovskite functionalized fiber-type heterostructured scintillators
    (AIP Publishing, 2023-02-21) Rogers, Edith; Birowosuto, Muhammad Danang; Maddalena, Francesco; Dujardin, Christophe; Pagano, Fiammetta; Kratochwil, Nicolaus; Auffray, Etiennette; Krause, Philip George; Bizarri, Gregory
    A fiber-type heterostructured scintillator based on bismuth germanate (Bi4Ge3O12) functionalized with the 2D-perovskite butylammonium lead bromide ((BA)2PbBr4) has been fabricated, and its scintillation performance analyzed toward its use for fast timing applications such as time-of-flight Positron Emission Tomography. The pixel shows energy sharing between the matrix and filler component, confirming that the two components are in synergy.