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Добірка наукової літератури з теми "Imageur portal"

Автор: Grafiati

Опубліковано: 22 липня 2022

Оновлено: 8 серпня 2022

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Статті в журналах з теми "Imageur portal"

Santoro, L., N. Aillères, S. Siméon, and P. Fenoglietto. "Vérification dosimétrique des traitements en conditions stéréotaxiques par imageur portal." Cancer/Radiothérapie 13, no. 6-7 (October 2009): 671. http://dx.doi.org/10.1016/j.canrad.2009.08.072.

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Fenoglietto, P., L. Bedos, N. Aillères, and J. Molinier. "Évaluation de la qualité des arcthérapies volumétriques modulées (VMAT) synchronisées à la respiration par imageur portal." Cancer/Radiothérapie 17, no. 5-6 (October 2013): 619–20. http://dx.doi.org/10.1016/j.canrad.2013.07.096.

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Largeron, G., S. Fafi, D. Nguyen, F. Josserand-Pietri, and M. Khodri. "Évaluation d’un nouveau logiciel de dosimétrie in vivo tridimensionnelle par imageur portal pour arcthérapie volumétrique modulée." Cancer/Radiothérapie 17, no. 5-6 (October 2013): 622. http://dx.doi.org/10.1016/j.canrad.2013.07.103.

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Benhalouche, S., J. Bert, O. Pradier, D. Visvikis, and N. Boussion. "Tomographie conique de 6 MV : simulation et évaluation GATE v6.2 Monte-Carlo d’un imageur portal avec application spécifique en radiothérapie ORL." Cancer/Radiothérapie 17, no. 5-6 (October 2013): 620. http://dx.doi.org/10.1016/j.canrad.2013.07.098.

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Jaffray, D. A., K. Chawla, D. G. Drake, and J. W. Wong. "Characterization of A re-designed clinical fluoroscopic portal imager." Radiotherapy and Oncology 37 (October 1995): S63. http://dx.doi.org/10.1016/0167-8140(96)80676-1.

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Dale, G. "Towards an evidence-based portal imaging protocol for prostate cancer. A critical review of the literature." Journal of Radiotherapy in Practice 3, no. 2 (March 2003): 91–99. http://dx.doi.org/10.1017/s1460396903000074.

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This article reviews portal imaging undertaken for prostate cancer with the intention of developing an imaging protocol for this category of patient. It explores the online and offline approaches of electronic portal imaging, when intervention for field placement errors (FPE) should take place and who actually makes this decision. The choice of reference image is discussed and the questions the use of re-simulation. This paper concludes that it is necessary to image for three fractions in the first week in order to highlight systematic errors, that an electronic portal imager is cost effective in time and money, and that radiographers should review images and make the decisions upon intervention strategies. Images will be reviewed via a quantitative template method rather than via a qualitative “eyeball” method.

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Nicolini, G., E. Vanetti, A. Clivio, A. Fogliata, G. Boka, and L. Cozzi. "Testing the portal imager GLAaS algorithm for machine quality assurance." Radiation Oncology 3, no. 1 (2008): 14. http://dx.doi.org/10.1186/1748-717x-3-14.

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Juste, B., R. Miró, S. Diez, J. M. Campayo, and G. Verdú. "Monte Carlo simulation of the iView GT portal imager dosimetry." Applied Radiation and Isotopes 68, no. 4-5 (April 2010): 922–25. http://dx.doi.org/10.1016/j.apradiso.2009.10.051.

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Krusser, Renata da Silva, Daniela Saito, and Ronice Müller De Quadros. "Portal de Libras." Fórum Linguístico 17, no. 4 (December 30, 2020): 5561–74. http://dx.doi.org/10.5007/1984-8412.2020.e77375.

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O Portal de Libras é uma interface que centraliza uma série de materiais e ferramentas disponíveis que tenham relação com a língua brasileira de sinais (Libras) e que possam ser usadas para fins de pesquisa e para fins educacionais. O Portal de Libras foi desenvolvido para compreender ferramentas que fomentem a constituição de uma rede de formação e/ou comunidade de prática, viabilizando o compartilhamento de conhecimentos e a interação em Libras e em Português. Ela foi desenvolvida levando em conta aspectos relacionados à acessibilidade e à usabilidade web, sobretudo no que tange aos vídeos em Libras, uma vez que estes deverão permitir a fácil utilização do site, tanto em relação ao acesso aos menus e aos hiperlinks, quanto à utilização das ferramentas de comunicação disponibilizadas na comunidade de prática. Além disso, o sistema de gerenciamento de conteúdo do Portal foi customizado de modo a suportar a disponibilização dos vídeos sem a necessidade de implementação via código. O layout apresenta um design atraente e explora recursos visuais compatível com os usuários surdos. Foram desenvolvidas ferramentas que favoreçam a acessibilidade, indexação de informações e upload de vídeos, constituindo-se esta etapa numa possibilidade de pesquisas e desenvolvimento de produtos que poderão ser revertidos a toda comunidade surda e ouvinte. Ademais, a rede/comunidade dispõe de repositórios para compartilhamento de materiais, tais como imagens, arquivos, fotos, ferramentas de apoio à decisão, ferramentas visuais para atividades colaborativas. O desenvolvimento envolveu várias pesquisas que serão descritas neste artigo.

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Zhang, Miao, Songbing Qin, Ting Chen, Sung Kim, Salma Jabbour, Bruce Haffty, and Ning J. Yue. "A Clinical Objective IMRT QA Method Based on Portal Dosimetry and Electronic Portal Imager Device (EPID) Measurement." Technology in Cancer Research & Treatment 12, no. 2 (April 2013): 145–50. http://dx.doi.org/10.7785/tcrt.2012.500314.

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Дисертації з теми "Imageur portal"

Camilleri, Jérémy. "Dosimétrie in vivo des traitements de radiothérapie conformationnelle avec modulation d'intensité par imageur portal haute énergie au silicium amorphe." Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2736/.

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La réalisation de la dosimétrie in vivo (DIV) en radiothérapie externe reste difficilement applicable dans le cadre d'irradiations conformationnelles avec modulation d'intensité (RCMI) où la mesure obtenue à l'aide de détecteurs ponctuels placés en entrée de patient est trop peu représentative de la dose réellement délivrée au volume cible. L'utilisation des imageurs haute énergie au silicium amorphe ("Electronic Portal Imaging Device", EPID) dans ce contexte est une alternative intéressante à condition de disposer en parallèle d'algorithmes permettant de convertir le plus précisément possible le signal de l'EPID en dose absorbée dans le patient. Ce travail de thèse s'inscrit donc dans cette démarche et consiste à développer des méthodes de calculs applicables en clinique permettant d'utiliser l'EPID pour la pratique de la DIV des traitements par RCMI. En premier lieu nous présentons le dispositif d'imagerie utilisé tout au long de ces travaux ainsi que la caractérisation de sa réponse en fonction de plusieurs paramètres d'irradiation. Une méthode permettant de déterminer la dose reçue par le patient en un point situé sur l'axe du faisceau à partir du signal de l'EPID a par la suite fait l'objet d'une étude sur 92 patients traités par RCMI dynamique pour des pathologies pelviennes. Dans un second temps, un algorithme de rétroprojection permettant de reconstruire la dose reçue par le patient en deux dimensions a été développé. Pour cela, le signal de l'EPID obtenu en sortie de patient est d'abord converti en dose absorbée dans l'eau par convolution de l'image avec plusieurs kernels de redistribution. La dose ainsi calculée est ensuite rétroprojetée par l'intermédiaire de facteurs correctifs dépendants de la morphologie du patient et de sa transmission. L'évaluation de la méthode a été réalisée sur 26 faisceaux issus de 6 plans de traitements différents d'abord en condition de prétraitement (i. E. Sans patient placé entre la source et le détecteur), puis sur fantôme homogène et enfin in vivo. L'introduction de fonctions d'atténuation dépendantes de la profondeur de calcul dans notre modèle a finalement permis d'obtenir un algorithme capable de reconstruire la dose dans le patient en trois dimensions
In vivo dosimetry (IVD) is still a complex procedure for intensity-modulated radiation therapy (IMRT). The use of conventional point detectors does not give a good representation of the actual dose delivered to the target volume. On the other hand, EPID-based in vivo dosimetry methods appears to be an interesting and efficient option for carrying out such measurements provided that accurate algorithms allowing to convert EPID signal into patient absorbed dose are available. The present work consists in developing clinically applicable calculation methods to perform EPID-based IVD on intensity-modulated fields. As a starting point, the imaging device used throughout this work is described before considering its response with respect to several irradiation parameters. An IVD method enabling the calculation of the on-axis patient point dose from EPID signal was studied and evaluated for 92 pelvic cancer patients treated with IMRT. Then, a 2D back-projection in vivo dose reconstruction algorithm was developed. In this model, the EPID signal was first converted into absorbed dose in water by convolving the EPID image with dose redistribution kernels. The 2D dose distribution was then back-projected applying correction factors calculated from the patient morphology and transmission factor. The validity of the method was checked for 6 treatment plans (26 fields) in pretreatment situation (i. E. Without patient) with homogeneous phantom and finally in vivo. The last part of this work deals with the introduction of mathematical attenuation functions in order to devise a complete in vivo 3D dose reconstruction algorithm

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Chatrie, Roudier Frédéric. "Dosimétrie in-vivo et contrôle qualité en radiothérapie externe par réseaux de neurones." Thesis, Toulouse 3, 2021. http://www.theses.fr/2021TOU30175.

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Le domaine de l'intelligence artificielle a subi un essor considérable ces dernières années, notamment avec l'arrivée du Deep learning. Des applications diverses peuvent bénéficier de ces modèles, à condition d'avoir suffisamment de données représentatives du système. Ces avancées scientifiques sont principalement dues aux prouesses tech- nologiques qui amènent des capacités de calculs notables avec l'utilisation des cartes graphiques. Les réseaux de neurones artificiels appliqués à la radiothérapie externe peuvent avoir un grand intérêt, notamment pour contrôler la qualité des traitements. Dans ce travail, une récente approche a été investiguée, basée sur des réseaux de neurones. Ceux-ci permettent de reconstruire une distribution de dose absorbée 2D à partir de l'imageur portal dont le signal est récupéré avant et pendant le traitement, respectivement, pour l'étape de contrôle qualité et de dosimétrie in-vivo. En appliquant des corrections sur ce signal, il est possible de vérifier que le patient a bien reçu ce qui lui avait été prescrit préalablement. Les modèles utilisés sont, soit des réseaux de neurones multi-couches de type feed-forward, soit des réseaux de neurones convolutionnels. Ils ont été appliqués à différents types de traitements tels que la radiothérapie conformationnelle ou celle à modulation d'intensité. De plus, plusieurs énergies d'irradiation ainsi que différentes marques d'accélérateurs de particules ont été prises en charge. Afin d'évaluer la qualité du modèle conçu, le critère clinique γindex a été utilisé. Des résultats tout à fait satisfaisants ont été obtenus pour la phase de contrôle qualité. Cependant, même si des résultats prometteurs pour la phase de dosimétrie in-vivo ont été montrés, il reste des améliorations à apporter pour pouvoir utiliser de tels algorithmes en routine clinique
The field of artificial intelligence have received a considerable amount of attention in recent years, particularly thanks to the arrival of Deep learning. A wide range of applications can benefit from these models, provided there is sufficient data that is representative of the system. These scientific advances are mainly due to technological progress that enables significant computing capabilities with the use of GPUs. Artificial neural networks applied in the domain of external radiotherapy can be of great interest, especially for controlling the quality of treatments. In this work, a recent approach was investigated based on neural networks. These make possible the reconstruction of 2D absorbed dose distribution from the portal imager whose signal is recovered before and during the treatment, respectively, for quality assurance and in-vivo dosimetry. By correcting this signal, it is possible to verify that the patient has accurately received the prescribed treatment. The models used are either feed-forward multi-layer neural networks or convolutional neural networks. They have been applied to different types of treatments, such as conformational or intensity-modulated radiotherapy. In addition, several irradiation energies as well as different particle accelerators manufacturers have been supported. In order to assess the quality of the design, the clinical criterion γindex was used. Completely satisfactory results were obtained for the quality assurance phase. However, although promising result for the in-vivo dosimetry phase have been shown, there are still improvements to be made to be able to use such algorithms in clinical routine

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Lim, Seng Boh. "2d dose measurement using a flat panel EPID." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/1609.

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The increasing use of intensity modulated radiation therapy (IMRT) to deliver conformal radiation treatment has prompted the search for a faster and more cost effective quality assurance (QA) system. The standard technique relies on the use of film for two-dimensional dose distribution verification. Although film is considered the gold standard and is widely used for this purpose, the procedures involved are relatively lengthy, labour intensive and costly for a multiple field IMRT verification. In this study, we investigate the use of an amorphous silicon electronic portal imaging device (a-Si EPID) to complement the film. The dosimetric behaviour of the device is studied both experimentally and numerically using the EGSnrc Monte Carlo simulation routine. The intrinsic build-up of the flat panel EPID was found to be 1.1 cm of water equivalent material. The response of the flat panel EPID was found to be linear between 0 and 300 cGy. To calibrate the flat panel EPID for two dimensional dose measurements, the deconvolution method was chosen. The scatter dose kernel required for this calibration method was calculated and characterized by varying the energy, spectrum and phantom material using a 6MV pencil beam. We found that flat panel EPID scatter kernel has as much as 80% more scattering power than the water scatter kernel in the region 1 cm away from the center of a 6MV pencil beam. This confirms that a flat panel EPID behaves significantly differently from water dosimetrically and requires an accurate dose scatter kernel for calibration. A 1.0 cm wide picket fence test pattern was used to test the accuracy of the kernel. Using the deconvolution method with the calculated dose kernels, the measurements from the flat panel EPID show improved agreement with the films.

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Lachaîne, Martin. "Monte Carlo optimization of a metalamorphous-selenium portal imager." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27539.

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An amorphous-Selenium (a-Se) based portal detector, which uses the metal substrate as a conversion plate, is studied using Monte Carlo techniques. The optimal thickness and material of the metal plate and a-Se thicknesses are investigated by modelling dose deposition in the a-Se layer for a 6 MV exit beam. Simulations of Detective Quantum Efficiency DQE(f) show that although DQE(0) increases with metal thickness up to $d sb{max},$ there is a cross-over near 1 cycle/mm which indicates that smaller metal thicknesses are more useful to visualize edges and small objects. A similar cross-over, though not as prominent, is also observed with constant metal thickness while varying a-Se thickness. Tungsten front plates are shown be optimal in terms of DQE for the plates under investigation. The effect of the scattered beam, described by the Scatter Fraction SF and Scatter-to-Primary Ratio SPR, is also modelled to ensure that the front-plate, which also acts as a scatter-rejection tool, satisfactorily filters out the scatter component. The SF is measured experimentally with a prototype imager for four metal plate/a-Se combinations and agrees with the Monte Carlo results within experimental uncertainties.

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Lynde, Clément. "Développement d'un imageur neutron portable." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAE006/document.

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Le sujet de la thèse vise à développer un imageur neutron portable présentant des performances de détection compatibles avec les besoins de la recherche et de l’industrie nucléaire, notamment ceux du démantèlement. Cette thèse se décompose en trois axes principaux de recherche, précédés d’une phase de recherche bibliographique. Suite à cette dernière, l’approche de localisation retenue est l‘imagerie de neutrons rapides par encodage spatial. Les détecteurs de neutrons ont été étudiés et plusieurs choix, adaptés à cette problématique, ont été retenus pour la suite de l’étude. Le premier axe est consacré aux études sur le développement d’un détecteur de neutrons sensible à la position. Le deuxième axe est lié à la conception et au prototypage d’un imageur neutronique, se reposant sur un masque codé et un détecteur Timepix modifié par une couche de paraffine. Le dernier axe concerne le déploiement et la caractérisation expérimentale de ce prototype
The subject of the thesis aims at developing a portable neutron imager with detection performance compatible with the needs of the nuclear research and industry, in particular those of decommissioning. This thesis is divided into three main areas of research, preceded by a bibliographic research phase. Following the latter, the localization approach adopted is spatial encoding fast neutron imaging. Neutron detectors were studied and several choices adapted to this challenge were selected for the continuation of the study. The first axis is dedicated to the studies on the development of a position-sensitive neutron detector. The second axis is related to the design and prototyping of a portable neutron imager, based on a coded aperture and a Timepix detector enhanced with a paraffin layer. The last axis concerns the deployment and experimental characterization of this prototype

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Lachaîne, Martin. "Monte Carlo optimization of a metal/amorphous-selenium portal imager." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ37138.pdf.

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Jacoby, Grant A. "A metric model for Intranet portal business requirements." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FJacoby%5FPhD.pdf.

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Lachane, Martin. "Portal imaging with a direct-detection active matrix flat panel imager." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38070.

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The problem of charge creation by x-rays in amorphous selenium (a-Se) is studied. A quantitative theory is developed which includes collective and single electron-hole pair excitations by a passing electron. This theory is incorporated into a Monte Carlo code to calculate track structures in a-Se. The initial positions of the electron-hole pairs along these tracks are used to study the fraction of pairs which recombine versus incident x-ray energy and applied electric field. The experimentally-observed energy dependence of recombination is attributed to a spur size which is dependent on the velocity of the ionizing electrons. The theory and simulations agree with available experimental data in the energy range from 20 keV to 10 MeV.
The use of an a-Se based direct-detection active matrix flat-panel imager (AMFPI) is explored at megavoltage energies for use in the verification of radiotherapy treatments. As with most other megavoltage detectors, a metal front plate is used to reduce patient scatter and to act as a buildup layer. The Modulation Transfer Function (MTF), Noise Power Spectrum (NPS), and Detective Quantum Efficiency (DQE) are measured. The DQE for the direct detection AMFPI is compared with the published DQE of an indirect detection AMFPI for portal imaging. The direct detector has a lower DQE at zero frequency, but there is a cross-over at approximately 0.3 cycles/mm after which it has a higher DQE.
A theoretical expression for the DQE of medical imaging detectors with non-elementary cascade stages is derived. This formalism can be used in conjunction with Monte Carlo techniques to evaluate the DQE of megavoltage imaging detectors. The predictions of the theory agree with the experimental DQE results for the direct-detection AMFPI and also for published results for the DQE of both a metal/phosphor detector and an indirect-detection AMFPI.
The effect of scatter on image quality is modeled in terms of the scatter fraction (SF) and scatter-to-primary ratio (SPR) using Monte Carlo techniques. To validate these simulations, the SF is measured experimentally using a prototype a-Se detector which uses an electrostatic probe to measure the a-Se surface potential. The simulations are used, along with the DQE simulations, to study the effect of metal/a-Se or metal/phosphor thicknesses on image quality in direct and indirect AMFPIs at megavoltage energies. It is found that for a-Se or phosphor thicknesses less than about 300 mum, a front plate of about 1 mm copper is optimal whereas for larger a-Se/phosphor thicknesses a front plate of about 0.4 mm may in some situations lead to better image quality.

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Rader, Neil Christopher. "Development of a Civil Engineer Corps community portal prototype." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Jun%5FRader.pdf.

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Watanabe, Érika Yumi. "Avaliação do dispositivo eletrônico de imagem portal \"Portal Dosimetry\" no controle de qualidade de radioterapia de intensidade modulada." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-08082011-110213/.

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No presente trabalho serão apresentados testes de comissionamento e de avaliação da utilização do portal dosimetry, da Varian, no controle de qualidade dos planejamentos de radioterapia de intensidade modulada. Os testes de comissionamento foram realizados para caracterizar o portal dosimetry em termos dosimétricos e para avaliar a sua possível aplicação em radioterapia. Esses testes demonstraram que o portal dosimetry possui todas as características necessárias para ser utilizado em dosimetria na radioterapia tais como linearidade da resposta com a dose, independência com a taxa de dose, reprodutibilidade, dentre outras. A avaliação da utilização do portal dosimetry no controle de qualidade de IMRT foi realizada em duas etapas: avaliação da capacidade do dispositivo em detectar erros propositalmente introduzidos em fluências simples e em fluências complexas. Foram introduzidos erros de magnitude conhecida em áreas determinadas das fluências e foi realizado o controle de qualidade dessas fluências com o portal dosimetry e com mais três sistemas dosimétricos: câmara de ionização, filme e matriz de câmaras de ionização. Os dados obtidos com o portal foram comparados com os dos outros dispositivos e todos foram capazes de identificar os erros introduzidos de maneira satisfatória, sendo os valores, normalizados para a fluência original, obtidos com o dosímetro portal indênticos aos da câmara de ionização e aos da matriz de câmaras de ionização (seven29) e diferindo em até 2% dos valores obtidos com os filmes. As fluências medidas com o portal dosimetry foram avaliadas em termos quantitativos e qualitativos. Os índices da função gama fornecidos pelo software de análise do portal dosimetry não apresentaram regras definidas de comportamento em relação aos erros introduzidos e por essa razão a análise qualitativa se mostrou indispensável nos casos avaliados.
In this paper we present commissioning testing and evaluation of the use of Varians portal dosimetry in the quality assurance of intensity-modulated radiotherapy. The commissioning tests were performed to characterize the portal dosimetry in terms dosimetric and to assess the its possible application in radiotherapy. These tests demonstrated that portal dosimetry has all the characteristics to be used for dosimetry in radiotherapy such as linear response with dose, the independence of dose rate, reproducibility, and others. The evaluation of the use of portal dosimetry in quality control of IMRT was performed in two steps: assessing the ability of the device to detect errors deliberately introduced in simple and complex fluences. Errors of known magnitude were introduced in certain areas of fluences and was carried out quality control of these fluences with portal dosimetry and three dosimetric systems: ionization chamber, film and array of ionization chambers. The data obtained from the portal were compared with those of other devices and all were able to identify errors introduced satisfactorily, the values, normalized to the original fluence, obtained with the portal dosimetry were similar to the ionization chamber and the array of ion chambers (seven29) and differing in up to 2% of the values obtained with the films. The fluences measured with the portal dosimetry were evaluated both quantitatively and qualitatively. The index of the gamma function provided by software analysis of portal dosimetry showed no defined rules of behavior in relation to the errors introduced and for this reason the qualitative analysis has proved indispensable in cases evaluated.

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Книги з теми "Imageur portal"

Alum, Tony. Images from a broken mirror: A story from Porta Pallazzo. Enugu, Nigeria: Raymond Pub., 2004.

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Moskatova, Olga, ed. Images on the Move. Bielefeld, Germany: transcript Verlag, 2021. http://dx.doi.org/10.14361/9783839452462.

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In contemporary society, digital images have become increasingly mobile. They are networked, shared on social media, and circulated across small and portable screens. Accordingly, the discourses of spreadability and circulation have come to supersede the focus on production, indexicality, and manipulability, which had dominated early conceptions of digital photography and film. However, the mobility of images is neither technologically nor conceptually limited to the realm of the digital. The edited volume re-examines the historical, aesthetical, and theoretical relevance of image mobility. The contributors provide a materialist account of images on the move - ranging from wired photography to postcards to streaming media.

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Ng, Jenna. The Post-Screen Through Virtual Reality, Holograms and Light Projections. NL Amsterdam: Amsterdam University Press, 2021. http://dx.doi.org/10.5117/9789463723541.

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Screens are ubiquitous today. They display information; present image worlds; are portable; connect to mobile networks; mesmerize. However, contemporary screen media also seek to eliminate the presence of the screen and the visibilities of its boundaries. As what is image becomes increasingly indistinguishable against the viewer’s actual surroundings, this unsettling prompts re-examination about not only what is the screen, but also how the screen demarcates and what it stands for in relation to our understanding of our realities in, outside and against images. Through case studies drawn from three media technologies – Virtual Reality; holograms; and light projections – this book develops new theories of the surfaces on and spaces in which images are displayed today, interrogating critical lines between art and life; virtuality and actuality; truth and lies. What we have today is not just the contestation of the real against illusion or the unreal, but the disappearance itself of difference and a gluttony of the unreal which both connect up to current politics of distorted truth values and corrupted terms of information. The Post-Screen Through Virtual Reality, Holograms and Light Projections: Where Screen Boundaries Lie is thus about not only where the image’s borders and demarcations are established, but also the screen boundary as the instrumentation of today’s intense virtualizations that do not tell the truth. In all this, a new imagination for images emerges, with a new space for cultures of presence and absence, definitions of object and representation, and understandings of dis- and re-placement – the post-screen.

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Reynolds, Brian. Porta paradisi: Marian doctrine and devotion, image and typology in the patristic and medieval periods. Taipei: Fu Jen University Press, 2009.

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Silva, Orlando da. Manuel Laranjeira, 1877-1912: Vivências e imagens de uma época. [Portugal: s.n.,], 1992.

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Silva, Orlando da. Manuel Laranjeira, 1877-1912: Vivências e imagens de uma época. [Portugal: s.n.,], 1992.

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A nau de Icaro: Seguido de imagem e miragem da lusofonia. Lisbon: Gradiva, 2004.

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João Paulo Ascenso Pereira da Silva. Temas, mitos e imagens de Portugal numa revista inglesa do Porto: The Lusitanian (1844-1845). Lisboa: Fundação Calouste Gulbenkian, 2001.

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João Paulo Ascenso Pereira da Silva. Temas, mitos e imagens de Portugal numa revista inglesa do Porto: The Lusitanian (1844-1845). Lisboa: Fundação Calouste Gulbenkian, 2001.

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Midal, Alexandra. Antidesign: Petite histoire de la capsule d'habitation en images. Paris]: Epithème, 2004.

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Частини книг з теми "Imageur portal"

Sarkar, Debkumar, and Anne M. Covey. "Preoperative Portal Vein Embolization." In Procedural Dictations in Image-Guided Intervention, 501–4. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40845-3_110.

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Hung, Mao-Hsiung, Shu-Chuan Chu, John F. Roddick, Jeng-Shyang Pan, and Chin-Shiuh Shieh. "An Effective Image Enhancement Method for Electronic Portal Images." In Computational Collective Intelligence. Technologies and Applications, 174–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16696-9_19.

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Skolnick, M. Leon, and Ellen R. Cohn. "Why Image the Velopharyngeal Portal." In Videofluoroscopic Studies of Speech in Patients with Cleft Palate, 1–4. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4613-8874-6_1.

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Lister, Ashley. "Imagery." In The Portable Poetry Workshop, 143–48. London: Macmillan Education UK, 2017. http://dx.doi.org/10.1057/978-1-137-60596-2_21.

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Skolnick, M. Leon, and Ellen R. Cohn. "How to Image the Velopharyngeal Portal." In Videofluoroscopic Studies of Speech in Patients with Cleft Palate, 5–14. New York, NY: Springer New York, 1989. http://dx.doi.org/10.1007/978-1-4613-8874-6_2.

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González-López, Antonio, Juan Morales-Sánchez, María-Consuelo Bastida-Jumilla, Francisco López-Sánchez, and Bonifacio Tobarra-González. "Denoising of Radiotherapy Portal Images Using Wavelets." In Lecture Notes in Computer Science, 198–207. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02267-8_22.

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Leszczynski, Konrad W., and Susan G. Boyko. "Digital Enhancement of Portal Images by Anisotropic Diffusion." In The Use of Computers in Radiation Therapy, 592–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-59758-9_222.

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Orkisz, Maciej, Anne Frery, Olivier Chapet, Françoise Mornex, and Isabelle E. Magnin. "Attempts to Bronchial Tumor Motion Tracking in Portal Images during Conformal Radiotherapy Treatment." In Computer Analysis of Images and Patterns, 247–55. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44692-3_31.

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Charnoz, Arnaud, Vincent Agnus, and Luc Soler. "Portal Vein Registration for the Follow-Up of Hepatic Tumours." In Medical Image Computing and Computer-Assisted Intervention – MICCAI 2004, 878–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-30135-6_107.

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Vos, F. M., J. Stoeckel, P. H. Vos, and A. M. Vossepoel. "Evaluation of an Automatic System for Simulator/Portal Image Matching." In Medical Image Computing and Computer-Assisted Intervention – MICCAI 2000, 442–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-540-40899-4_45.

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Тези доповідей конференцій з теми "Imageur portal"

Bloemenkamp, Richard, Elia Haddad, Nadege Bize-Forest, Laetitia Comparon, and Peter Schlicht. "FIELD-TESTING A THROUGH-THE-BIT HIGH-DEFINITION ELECTRICAL BOREHOLE IMAGER FOR OIL-BASED MUD." In 2021 SPWLA 62nd Annual Logging Symposium Online. Society of Petrophysicists and Well Log Analysts, 2021. http://dx.doi.org/10.30632/spwla-2021-0009.

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A new, through-the-bit, ultra-slim wireline borehole-imaging tool for use in oil-based mud provides photorealistic images. The imager is designed to be conveyed through drill-pipe. At the desired well section, it exits the drill pipe through a portal drill bit and starts the logging. Field test measurements in several horizontal, unconventional wells in North America show images of fine detail with a large amount of geological information and high value for well development. A relatively new solution for conveying tools to the deepest point of a high angle or horizontal wells uses a drill bit with a portal hole at the bit face. As soon as the bit reaches the total depth, a string of logging tools is pumped down through the drill pipe. The tools exit the bit through the portal hole, arriving in the open hole and are ready for the up log. The tools operate on battery and store the log data in memory so that no cable is interfering as the drill pipe is tripped out of the well while the tools are acquiring data. The quality of wireline electrical borehole images in wells drilled with oil-based mud has significantly improved in recent years. Modern microresistivity imagers operate in the megahertz-frequency range, radiating the electromagnetic signal through the non-conductive mud column. A composite processing scheme produces high-resolution impedivity images. The new, ultra-slim borehole-imager tool uses these measurement principles and processing methods. Innovating beyond the existing tool designs the tool is now re-engineered to dimensions sufficiently slim to fit through drill pipes and to use through-the-bit logging techniques. The new, ultra-slim tool geometry proves highly reliable and, due to the deployment technique, highly effective in challenging hole conditions. The tool did not suffer any damage and showed only minute wear over more than twenty field test wells. The tool’s twelve-pad geometry provides 75% coverage in a six-inch diameter borehole and its image quality compares very well with existing larger tools. The field test of this borehole imaging tool covers all scenarios from vertical to deviated and to long-reach, horizontal wells. Geological structures, sedimentary heterogeneities, faults and fractures are imaged with detail matching benchmark wireline images. The interpretation answers allow operators of unconventional reservoirs to employ intelligent stimulation strategies based on geological reality and effective well development. A new high-frequency borehole imager for wells drilled with oil-based mud is introduced. Deployed through the drill pipe and its portal bit, the imager carries photorealistic microresistivity images into wells where conventional wireline conveyance techniques reach their limits in both practicality and viability.

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Shish, А. А., and T. S. Chikova. "QUALITY CONTROL OF THE ELECTRONIC PORTAL IMAGE DETECTOR." In SAKHAROV READINGS 2021: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute of Belarusian State University, 2021. http://dx.doi.org/10.46646/sakh-2021-2-138-142.

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An important element of a modern high-tech radiotherapy complex based on a linear electron accelerator is an electronic detector of portal images. It ensures the accuracy of the patient’s positioning on the treatment table, the compliance of the delivered dose distribution with the planned one, and allows for fast and accurate verification of treatment plans with volumetric modulation of the radiation intensity. The main provisions of the quality control of the electronic portal image detector are considered. It is shown that it includes the following stages: installation and commissioning of equipment; radiation dose control; calibration; quality control of clinical images; software testing; development of a quality assurance program that ensures the effectiveness and reliability of the patient’s radiation conditions in the course of radiation therapy.

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Guo, Zonghui, Dongsheng Guo, Yufeng Jiang, Qianqian Li, Zhaorui Gu, Haiyong Zheng, Bing Zheng, and Guoyu Wang. "Underwater Image Enhancement Based on Intrinsic Images." In OCEANS 2021: San Diego – Porto. IEEE, 2021. http://dx.doi.org/10.23919/oceans44145.2021.9705714.

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Manjappa, Rakesh, Vyankatesh Shejal, Rajesh Kumar, and Rajan Kanhirodan. "Fluence calculation using portal images." In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/3d.2018.jw4a.35.

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Gerg, Isaac D., and Vishal Monga. "A Learnable Image Compression Scheme for Synthetic Aperture Sonar Imagery." In OCEANS 2021: San Diego – Porto. IEEE, 2021. http://dx.doi.org/10.23919/oceans44145.2021.9705685.

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Drake, Douglas G., David A. Jaffray, and John W. Wong. "Prototype amorphous silicon array based radiotherapy portal imager." In Medical Imaging 1997, edited by Richard L. Van Metter and Jacob Beutel. SPIE, 1997. http://dx.doi.org/10.1117/12.274000.

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Loew, Murray H., Julian G. Rosenman, and Jun Chen. "Clinical tool for enhancement of portal images." In Medical Imaging 1994, edited by Murray H. Loew. SPIE, 1994. http://dx.doi.org/10.1117/12.175089.

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Sung, Minsung, and Son-Cheol Yu. "Sonar Image Generation from Underwater Optic Images utilizing Sensor Models and Depth Estimation with Neural Network." In OCEANS 2021: San Diego – Porto. IEEE, 2021. http://dx.doi.org/10.23919/oceans44145.2021.9705748.

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Tao, Wenchao, Osman M. Ratib, Hwa Kho, Yung-Chao Hsu, Cun Wang, Cason Lee, and J. M. McCoy. "Open source portal to distributed image repositories." In Medical Imaging 2004, edited by Osman M. Ratib and H. K. Huang. SPIE, 2004. http://dx.doi.org/10.1117/12.535582.

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Рудинская, Алина, Alina Rudinskaya, Юрий Хмелевский, and Yuriy Hmelevskiy. "Designing a portable speaker with a support of a bionic method." In 29th International Conference on Computer Graphics, Image Processing and Computer Vision, Visualization Systems and the Virtual Environment GraphiCon'2019. Bryansk State Technical University, 2019. http://dx.doi.org/10.30987/graphicon-2019-1-226-229.

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This article discusses the problem of the lack of an artistic image of objects of this type. The analysis of aesthetic and ergonomic parameters in similar product models. Three artistic images of a portable speaker were selected corresponding to the main function of the designed product. For each artistic image, a conceptual design of the product body was created. Using a comparative analysis, the most promising outline solution of the case was determined from the point of view of aesthetic qualities and compliance with the main function of the product. An experimental prototyping of the design object was carried out using sculpted plasticine and foam, followed by an assessment of potential users and refinement of the shape of the product’s body and the location of its components. The result of the study was the layout of a portable bionic column speaker. The object has a spectacular appearance due to the bright image of the octopus tentacle, and also corresponds to aesthetic and ergonomic parameters.

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Звіти організацій з теми "Imageur portal"

Richey, Charles. Advanced Portable Differential Image Motion Monitor. Fort Belvoir, VA: Defense Technical Information Center, April 2000. http://dx.doi.org/10.21236/ada379276.

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Takahashi, Kenichi, Tomoaki Nakano, and Shin Yamamoto. A Study of Detection by Image Processing of Attention Concentration During Portable Communication. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0047.

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Gould, A. I., and N. E. M. Kinsman. Spatially referenced oblique aerial imagery of the Port Heiden shoreline, August 2013. Alaska Division of Geological & Geophysical Surveys, December 2013. http://dx.doi.org/10.14509/26866.

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Habib, Ayman, Darcy M. Bullock, Yi-Chun Lin, and Raja Manish. Road Ditch Line Mapping with Mobile LiDAR. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317354.

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Maintenance of roadside ditches is important to avoid localized flooding and premature failure of pavements. Scheduling effective preventative maintenance requires mapping of the ditch profile to identify areas requiring excavation of long-term sediment accumulation. High-resolution, high-quality point clouds collected by mobile LiDAR mapping systems (MLMS) provide an opportunity for effective monitoring of roadside ditches and performing hydrological analyses. This study evaluated the applicability of mobile LiDAR for mapping roadside ditches for slope and drainage analyses. The performance of alternative MLMS units was performed. These MLMS included an unmanned ground vehicle, an unmanned aerial vehicle, a portable backpack system along with its vehicle-mounted version, a medium-grade wheel-based system, and a high-grade wheel-based system. Point cloud from all the MLMS units were in agreement in the vertical direction within the ±3 cm range for solid surfaces, such as paved roads, and ±7 cm range for surfaces with vegetation. The portable backpack system that could be carried by a surveyor or mounted on a vehicle and was the most flexible MLMS. The report concludes that due to flexibility and cost effectiveness of the portable backpack system, it is the preferred platform for mapping roadside ditches, followed by the medium-grade wheel-based system. Furthermore, a framework for ditch line characterization is proposed and tested using datasets acquired by the medium-grade wheel-based and vehicle-mounted portable systems over a state highway. An existing ground filtering approach is modified to handle variations in point density of mobile LiDAR data. Hydrological analyses, including flow direction and flow accumulation, are applied to extract the drainage network from the digital terrain model (DTM). Cross-sectional/longitudinal profiles of the ditch are automatically extracted from LiDAR data and visualized in 3D point clouds and 2D images. The slope derived from the LiDAR data was found to be very close to highway cross slope design standards of 2% on driving lanes, 4% on shoulders, as well as 6-by-1 slope for ditch lines. Potential flooded regions are identified by detecting areas with no LiDAR return and a recall score of 54% and 92% was achieved by the medium-grade wheel-based and vehicle-mounted portable systems, respectively. Furthermore, a framework for ditch line characterization is proposed and tested using datasets acquired by the medium-grade wheel-based and vehicle-mounted portable systems over a state highway. An existing ground filtering approach is modified to handle variations in point density of mobile LiDAR data. Hydrological analyses, including flow direction and flow accumulation, are applied to extract the drainage network from the digital terrain model (DTM). Cross-sectional/longitudinal profiles of the ditch are automatically extracted from LiDAR data, and visualized in 3D point clouds and 2D images. The slope derived from the LiDAR data was found to be very close to highway cross slope design standards of 2% on driving lanes, 4% on shoulder, as well as 6-by-1 slope for ditch lines. Potential flooded regions are identified by detecting areas with no LiDAR return and a recall score of 54% and 92% was achieved by the medium-grade wheel-based and vehicle-mounted portable systems, respectively.

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BIZIKOEVA, L. S., and M. I. BALIKOEVA. LEXICO-STYLISTIC MEANS OF CREATING CHARACTERS (BASED ON THE STORY “THE POOL” BY W.S. MAUGHAM). Science and Innovation Center Publishing House, 2021. http://dx.doi.org/10.12731/2077-1770-2021-13-4-3-62-70.

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Purpose. The article deals with various lexico-stylistic means of portraying a literary character. The analysis is based on the empirical study of the story “The Pool” by a famous English writer William Somerset Maugham. The main methods used in the research are: the method of contextual analysis and the descriptive-analytical method. Results. The results of the research revealed that the peculiar characteristic of the story “The Pool” as well as of many other Maugham’s stories is the author’s strong presence. The portrayal characteristics of the protagonists, their manner of speech, the surrounding nature greatly contribute to creating the unforgettable characters of Lawson and his wife Ethel. Somerset Maugham employs various lexico-stylistic means to create the images of Lawson and Ethel, allowing the reader to vividly portray their personalities. Practical implications. The received results can be used in teaching Stylistics of the English language, stylistic analysis of the text as well as theory and practice of translation, in writing course and graduation papers.

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