Bibliografias temáticas / XSpectra

Literatura científica selecionada sobre o tema "XSpectra"

Autor: Grafiati

Publicado: 25 de maio de 2024

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Artigos de revistas sobre o assunto "XSpectra"

Quercia, J., F. Mele, D. Macera, B. Arcaini, B. Garavelli e G. Bertuccio. "Experimental characterization of a fast X-ray spectroscopic imager module using the ALTAIR P3 ASIC for real-time contaminants detection". Journal of Instrumentation 18, n.º 01 (1 de janeiro de 2023): C01064. http://dx.doi.org/10.1088/1748-0221/18/01/c01064.

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Abstract X-ray imagers with spectroscopic capabilities and high photon count rates are finding promising applications in industrial real-time inspection systems. In this context, XSpectra® combines a CdTe-based linear energy-resolved photon counting (ERPC) pixel sensor with real-time image processing techniques to detect low and high density contaminants. The detection unit makes use of a new analog read-out ASIC that has been designed by Politecnico di Milano to meet strict application requirements both in energy resolution and achievable photon count rate. A room-temperature low-rate spectroscopic characterization of the system at a peaking time of 60 ns showed an average equivalent noise charge of 259 electrons r.m.s. (2.72 keV FWHM in CdTe) and an average FWHM of the 59.5 keV 241Am line of 3.6 keV, with a 3σ dispersion in noise performance of ±10% over 256 channels. The detection unit was tested in high incoming photon flux conditions by means of an X-ray tube. Minimal spectral distortion due to pile-up events is obtained up to an Incoming Count Rate of 2.5 Mcps/channel, while the maximum counting capability of energy-resolved events is 2.2 Mcps/channel.

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Buniatyan, Armen. "Measurement of Feynman-xspectra of photons and neutrons in the very forward direction in deep-inelastic scattering at HERA". EPJ Web of Conferences 99 (2015): 13002. http://dx.doi.org/10.1051/epjconf/20159913002.

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Beck, Michael Thomas, Gregor Rugel, Julia Reinfelder, Torsten Kuwert, Philipp Ritt, Sebastian Kreissel e Tilo Schlittenbauer. "Quantitative Analysis of Multimodal Skeletal SPECT/CT Reconstructions in Diagnosing Medication-related Osteonecrosis of the Jaw". Nuklearmedizin - NuclearMedicine 60, n.º 06 (11 de agosto de 2021): 403–10. http://dx.doi.org/10.1055/a-1525-7621.

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Abstract Aim Our goal was to assess visual and quantitative aspects of multimodal skeletal SPECT/CT reconstructions (recon) in differentiating necrotic and healthy bone of patients with suspected MRONJ. Methods Prior to surgery, 20 patients with suspected MRONJ underwent SPECT/CT of the jaw 3–4 hours after injection of Tc-99m-DPD (622±112.4 MBq). SPECT/CT data were reconstructed using the multimodal xSPECT Bone and xSPECT Quant algorithms as well as the OSEM-algorithm FLASH 3D. For analysis, we divided the jaw into 12 separate regions. Both xSPECT Bone and FLASH 3D datasets were scored on a four-point scale (VIS xSPECT; VIS F3D), based on the intensity of localized tracer uptake. In F3D and xSPECT Quant datasets, local tracer uptake of each region was recorded as semi-quantitative uptake ratio (SQR F3D) or SUVs, respectively. ROC analysis was performed. Postoperative histologic results served as gold standard. Results VIS F3D, VIS xSPECT and SQR F3D did not differ significantly in diagnostic accuracy (VIS xSPECT sensitivity=0.64; specificity=0.89). Of the quantitative parameters, SUVpeak yielded the best interobserver reproducibility. SUVpeak was 9.9±7.1 (95%CI: 7.84–11.95) in MRONJ regions, as opposed 3.6±1.8 (95% CI:3.36–3.88) elsewhere, with a cutpoint of 4.5 (sensitivity=0.83; specificity=0.80). Absolute quantitation significantly surpassed VIS and SQR (p<0.05) in accuracy and interobserver agreement (SUVpeak: κ=0.92; VIS xSPECT: κ=0.61; SQR F3D κ=0.66). Conclusion Absolute quantitation proved significantly more accurate than visual and semi-quantitative assessment in diagnosing MRONJ, with higher interobserver agreement.

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Ignacchiti Lacerda, Marcela, Bruna Costa Rodrigues, Guilherme Ramires de Jesús, Flávia Cunha Dos Santos, Nilson Ramires de Jesús, Roger A. Levy e Evandro Mendes Klumb. "The association between active proliferative lupus nephritis during pregnancy and small for gestational age newborns". Clinical and Experimental Rheumatology 39, n.º 5 (31 de agosto de 2021): 1043–48. http://dx.doi.org/10.55563/clinexprheumatol/xspect.

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Ungania, Sara, Marco D’Arienzo, Sandro Nocentini, Marco D’Andrea, Vicente Bruzzaniti, Raffaella Marconi, Emilio Mezzenga et al. "Optimization of 99mTc-MAA SPECT/CT Imaging for 90Y Radioembolization Using a 3D-Printed Phantom". Applied Sciences 12, n.º 19 (6 de outubro de 2022): 10022. http://dx.doi.org/10.3390/app121910022.

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Radioembolization (RE) with 90Y-microspheres has gained widespread acceptance as a safe and effective technique for treating liver malignancies. Accurate quantification in RE is a key step in treatment planning optimization and is becoming a pressing issue in light of the Directive 2013/59/EURATOM. The aim of this study was to develop a SPECT/CT imaging protocol for quantitative imaging optimization in RE based on cutting edge imaging technology (Symbia IntevoTM system provided with the innovative xSPECT software) and a novel anthropomorphic 3D-printed phantom. In the present study, 99mTc-labeled macroaggregated albumin was used as a surrogate radiopharmaceutical for treatment planning. Gamma camera calibration factors and recovery coefficients were determined performing preliminary SPECT/CT acquisitions of a point source, a cylindrical homogeneous phantom and the NEMA/IEC phantom. Data reconstruction was performed using the built-in xSPECT package, using both the Ordered Subset Expectation–Maximization (OSEM) and the Ordered Subset Conjugated Gradient (OSCG) algorithm. Specific regions of interest (ROIs) were drawn on the MIM 6.1.7 system according to the physical volume. The quantification procedure was validated using the anthropomorphic phantom provided with a fillable liver section and spheres of different diameters (20 mm, 40 mm and a 40 mm spherical shell). The measured activity concentration in all geometries is consistent within 4%, demonstrating that the xSPECT software permit an absolute quantification in anthropomorphic geometry largely within the 10% recommended from the manufacturer. Caution is advised in the presence of spherical objects with a necrotic core, as underestimations in the order of 20% were obtained.

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Christopher, Hoog, Verrecchia-Ramos Emilie, Dejust Sebastien, Lalire Paul, Sezin Ghali, Moubtakir Abdenasser, El Farsaoui Khadija et al. "Implementation of xSPECT, xSPECT bone and Broadquant from literature, clinical survey and innovative phantom study with task-based image quality assessment". Physica Medica 112 (agosto de 2023): 102611. http://dx.doi.org/10.1016/j.ejmp.2023.102611.

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Schnopper, Herbert W. "XSPECT: A Telescope/Spectrometer System on SPECTRUM RÖNTGEN GAMMA". International Astronomical Union Colloquium 115 (1990): 307–17. http://dx.doi.org/10.1017/s0252921100012513.

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AbstractThe SPECTRUM RÖNTGEN-GAMMA mission is being developed by the Babakin Center (BC) together with the Space Research Institute (IKI) of the Academy of Sciences, USSR and is scheduled for launch in 1993. Mission objectives include broad and narrow band imaging spectroscopy over a wide range of energies from the EUV through gamma rays with particular emphasis on the study of extragalactic objects. The Danish Space Research Institute (DSRI) BC and IKI share the responsibility for the preparation of the XSPECT system. Two thin foil telescopes which are conical shell approximations to Wolter 1 geometry, each with an aperture of 60 cm and a focal length of 8 m, are designed to have a half-power width of less than 2 arcmin and will have collecting areas of 1700 and 1200 cm at 2 and 8 keV, respectively. Images and spectra will be recorded with position sensitive proportional counters with good spectral resolution. An objective Bragg crystal panel, placed in front of one of the telescopes, will make high resolution spectroscopic studies (E/ΔE ~103) of point- and extended sources. Other instruments are under consideration.

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Tran-Gia, Johannes, e Michael Lassmann. "Characterization of Noise and Resolution for Quantitative 177Lu SPECT/CT with xSPECT Quant". Journal of Nuclear Medicine 60, n.º 1 (5 de julho de 2018): 50–59. http://dx.doi.org/10.2967/jnumed.118.211094.

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Armstrong, Ian S., e Sandra A. Hoffmann. "Activity concentration measurements using a conjugate gradient (Siemens xSPECT) reconstruction algorithm in SPECT/CT". Nuclear Medicine Communications 37, n.º 11 (novembro de 2016): 1212–17. http://dx.doi.org/10.1097/mnm.0000000000000586.

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Chen, Ew-Jun, Teik Hin Tan e Ming Tsuey Chew. "Superscan: Superiority of xSPECT/CT over OSEM SPECT/CT in bone scans of prostate cancer patients." Radiation Physics and Chemistry 178 (janeiro de 2021): 108998. http://dx.doi.org/10.1016/j.radphyschem.2020.108998.

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Teses / dissertações sobre o assunto "XSpectra"

Delhommaye, Steven. "Single-particle modelling of X-ray Absorption and X-ray Raman Scattering spectra : from the impact of vibrations on multipole transition channels to the implementation of L2,3 edges". Electronic Thesis or Diss., Sorbonne université, 2022. http://www.theses.fr/2022SORUS076.

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Ce travail de thèse porte sur les spectroscopies d’électrons de niveau de cœur ainsi que leur modélisation par la suite de code open source Quantum ESPRESSO. Il porte en particulier sur la Spectroscopie d’Absorption des rayons X (XAS), déjà bien établie, et la Spectroscopie Raman des rayons X (XRS), une alternative au XAS gagnant en popularité, par exemple dans le cas de mesures sous conditions extrêmes. Le premier objectif de cette thèse était l’étude de l’impact des vibrations thermiques des noyaux sur les contributions multipolaires en XAS et en XRS. En effet, le modèle QHA utilisé pour prendre en compte ces effets a déjà fait ses preuves dans le cas d’oxides légers, mais n’a jamais été utilisé pour étudier ces effets sur les canaux quadripolaire en XAS et monopolaire en XRS. L’étude repose sur la comparaison entre calcul et expérience, sur deux composés de référence : TiO2 rutile et α-Al2O3. Par ailleurs, un défaut du modèle QHA concernant la reproduction de subtils effets de dépendance angulaires a été découvert et corrigé par la théorie des groupes. Le second objectif de cette thèse était l’implémentation du calcul des seuils L2,3 en XRS dans le module XSpectra de Quantum ESPRESSO. Cette implémentation est inspirée des précédentes implémentations du calcul de seuils K en XRS et de seuils L2,3 en XAS. L'implémentation comprend les contribution monopolaire et dipolaire jusqu’au premier ordre du développement de l’opérateur de transition XRS. Elle est testée par comparaison entre calcul et expérience pour divers composés du soufre. Un bon accord entre calcul et expérience est obtenu, bien que très sensible à l’approximation du trou de cœur choisie
This thesis work focuses on core level spectroscopies and their modelling by Quantum ESPRESSO, an open-source suite of codes. In particular this work focuses on X-Ray absorption spectroscopy (XAS), already well established, and X-Ray Raman Scattering (XRS), proving to be an increasingly popular alternative to XAS, for example under harsh experimental conditions. The first objective of this work was to study the impact of the thermal vibrations of nuclei on the multipole contributions available in XAS and XRS. Indeed, the QHA model used in this work to account for these vibration effects has been used to study light oxides before, but never to assess these effects on the secondary contribution channels of XAS (quadrupole) and XRS (monopole). The study relies on comparison between calculation and experimental data on two well-known reference compounds, rutile TiO2 and α-Al2O3. Moreover, a flaw of the QHA model when trying to reproduce subtle angular dependence signals was discovered and corrected using group theory. The second objective of the thesis was to implement calculation of XRS L2,3 edges in the XSpectra module of Quantum ESPRESSO. It was inspired by the previous implementations of XAS L2,3 edges and XRS K edges calculations in XSpectra. The monopole and dipole contributions were implemented up to the first order of the expansion of the XRS transition operator. It was tested by comparing calculation and measured data on various sulphur compounds. Good agreement with data could be produced, but was found very sensitive to the chosen core hole approximation

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Capítulos de livros sobre o assunto "XSpectra"

Schnopper, H. W. "Astrophysics with Xspect/Sodart on Spectrum X-Gamma". In Astrophysics and Space Science Library, 497. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0794-5_48.

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Cabaret, Delphine, e Matteo Calandra. "XSpectra: a density-functional-theory-based plane-wave pseudopotential code for XANES calculation". In International Tables for Crystallography. Chester, England: International Union of Crystallography, 2020. http://dx.doi.org/10.1107/s1574870720003328.

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Trabalhos de conferências sobre o assunto "XSpectra"

Garavelli, B., P. Pozzi, D. Macera, L. Zanotti, A. Mencarelli, G. Bubba, P. Bertoni et al. "XSpectra®: an Advanced Real-Time Food Contaminants Detector". In 2019 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC). IEEE, 2019. http://dx.doi.org/10.1109/nss/mic42101.2019.9059829.

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Garavelli, Bruno, Alessandra Mencarelli e Luca Zanotti. "XSpectra®: The most advanced real time food contaminants detector". In 2017 IEEE Biomedical Circuits and Systems Conference (BioCAS). IEEE, 2017. http://dx.doi.org/10.1109/biocas.2017.8325176.

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Sammartini, M., D. Rizzo, P. Distefano, D. Macera e B. Garavelli. "Spatial Resolution Enhancement and Hardware Upgrade in XSpectra^® Technology". In 2022 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC). IEEE, 2022. http://dx.doi.org/10.1109/nss/mic44845.2022.10399207.

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Garavelli, B., D. Macera, D. Rizzo e M. Sammartini. "Improving the Real-Time Sub-Millimeter Contaminants Detection Capability of XSpectra^®". In 2021 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC). IEEE, 2021. http://dx.doi.org/10.1109/nss/mic44867.2021.9875670.

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Christensen, Bent G., Frank Allan Hansen e Niels Olof Bouvin. "Xspect". In the twelfth international conference. New York, New York, USA: ACM Press, 2003. http://dx.doi.org/10.1145/775152.775222.

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Ma, Jun, e Alexander Hans Vija. "Evaluation of quantitation accuracy for xSPECT". In 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC). IEEE, 2015. http://dx.doi.org/10.1109/nssmic.2015.7582030.

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Westergaard, Niels J., Josef Polny, Finn E. Christensen, Hans U. Noergaard-Nielsen e Herbert W. Schnopper. "XSPECT telescopes on the SRG: optical performance". In SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, editado por Richard B. Hoover e Arthur B. C. Walker, Jr. SPIE, 1994. http://dx.doi.org/10.1117/12.193167.

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Budtz-Joergensen, Carl, Axel Bahnsen, M. M. Madsen, C. Olesen e Herbert W. Schnopper. "X-ray imaging with the XSPECT/SODART microstrip proportional counters". In San Diego '92, editado por Oswald H. W. Siegmund. SPIE, 1992. http://dx.doi.org/10.1117/12.130678.

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Tristram, Matthieu. "Xspect / Xpol : CMB angular power spectra estimator using cross-correlation". In CMB and Physics of the Early Universe. Trieste, Italy: Sissa Medialab, 2007. http://dx.doi.org/10.22323/1.027.0063.

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Jüptner, M., L. Ermert, T. L. Maier, S. Szymczak, M. Zuhayra e U. Lützen. "Quantitative xSPECT-Bildgebung im Rahmen der Indikationsstellung zur Radiosynoviorthese (RSO) von Kniegelenken". In 60. Jahrestagung der Deutschen Gesellschaft für Nuklearmedizin. Georg Thieme Verlag KG, 2022. http://dx.doi.org/10.1055/s-0042-1746077.

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