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Artykuły w czasopismach na temat "Scanner spectral à comptage photonique"
Garcelon, C., J. Abascal, C. Olivier, S. Si-Mohamed, S. Uk, H. K. Ea, L. Boussel, P. Douek, F. Peyrin i C. Chappard. "Analyse quantitative morphologique du cartilage à partir du scanner spectral à comptage de photons". Revue du Rhumatisme 87 (grudzień 2020): A261. http://dx.doi.org/10.1016/j.rhum.2020.10.470.
Pełny tekst źródłaGarcelon, C., J. Abascal, C. Olivier, S. Si-Mohamed, P. Douek, F. Peyrin i C. Chappard. "Quantification de l’épaisseur du cartilage sur des images de scanner spectral à comptage de photons". Revue du Rhumatisme 89 (grudzień 2022): A199. http://dx.doi.org/10.1016/j.rhum.2022.10.300.
Pełny tekst źródłaAbascal, J., C. Olivier, S. Uk, S. Si-Mohamed, H. K. Ea, L. Boussel, P. Douek, F. Peyrin i C. Chappard. "Analyse quantitative morphologique des géodes sous-chondrales à partir du scanner spectral à comptage de photons". Revue du Rhumatisme 87 (grudzień 2020): A93. http://dx.doi.org/10.1016/j.rhum.2020.10.159.
Pełny tekst źródłaRozprawy doktorskie na temat "Scanner spectral à comptage photonique"
Raviol, Jolan. "Vers l'évaluation du risque de rupture des anévrismes intracrâniens : caractérisation mécanique in vivo de la paroi artérielle". Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2024. http://www.theses.fr/2024ECDL0011.
Pełny tekst źródłaIntracranial aneurysms are a critical public health condition linked to the degradation of the cerebral artery wall. There is currently no method for estimating the risk of aneurysm rupture that takes into account the in vivo mechanical properties of the aneurysm wall, which are believed to be essential in the rupture phenomenon. This doctoral work is part of a large-scale project aimed at improving the intervention criteria currently available to practitioners by developing a non-invasive decision-support tool based on the mechanical state of the tissue to assess the probability of rupture. This tool will be based on the definition of a relationship between the shape of the aneurysm observed by clinical imaging and a database containing a set of clinical images from previous studies, associated with the in vivo mechanical properties of the wall and a characterisation of the rupture. To produce this database, an aneurysm wall deformation device was developed as part of the overall project. This doctoral work focuses on (1) the calibration, the optimisation and in vitro testing of this device on phantom arteries and (2) the in vivo application of the device on an animal model of intracranial aneurysm. To do this, a numerical model of the in vitro experiment was implemented and validated against the experimental results by developing an original validation method. This finite element model of fluid-structure interaction was used to understand the uncertainties involved in using the device within the aneurysm and to help for dimensioning the phantom arteries. The best compromise in terms of phantom artery wall thickness and flexibility was identified, taking into account the limitations of the fabrication techniques. In addition, an inverse analysis procedure was developed to estimate the mechanical characteristics of the aneurysm wall in vivo. Its use is based on quantifying the deformation generated by the device and visualised by spectral photon-counting computed tomography, an emerging medical imaging technique whose spatio-temporal resolutions allow controlled stressing of the tissue without increasing the risk of rupture. The mechanical properties identified were consistent with those derived from ex vivo characterisations of similar aneurysms available in the literature. Finally, a first patient-specific criterion for rupture of the aneurysm wall, taking into account the state of stress in vivo in the tissue, was proposed
Niu, Pei. "Multi-energy image reconstruction in spectral photon-counting CT". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI022.
Pełny tekst źródłaSpectral photon-counting CT (sCT) appeared recently as a new imaging technique presenting fundamental advantages with respect to conventional CT and duel-energy CT. However, due to the reduced number of photons in each energy bin of sCT and various artifacts, image reconstruction becomes particularly difficult. This thesis focuses on the reconstruction of multi-energy images in sCT. First, we propose to consider the ability of sCT to achieve simultaneously both anatomical (aCT) and functional imaging (fCT) in one single acquisition through reconstruction and material decomposition. aCT function of sCT is studied under the same configuration as that of conventional CT, and fCT function of sCT is investigated by applying material decomposition algorithms to the same acquired multi-energy data. Then, since noise is a particularly acute problem due to the largely reduced number of photons in each energy bin of sCT, we introduce denoising mechanism in the image reconstruction to perform simultaneous reconstruction and denoising. Finally, to improve image reconstruction, we propose to reconstruct the image at a given energy bin by exploiting information in all other energy bins. The key strategy in such approach consists of grouping the similar pixels from the reconstruction of all the energy bins into the same class, fitting within each class, mapping the fitting results into each energy bin, and denoising with the mapped information. It is used both as a post-denoising operation to demonstrate its effectiveness and as a regularization term or a combined regularization term for simultaneous reconstruction and denoising. All the above methods are evaluated on both simulation and real data from a pre-clinical sCT system