Relevant bibliographies by topics / DQE

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'DQE'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "DQE"

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Stanton, M., W. C. Phillips, Y. Li, and K. Kalata. "The detective quantum efficiency of CCD and vidicon-based detectors for X-ray crystallographic applications." Journal of Applied Crystallography 25, no. 5 (October 1, 1992): 638–45. http://dx.doi.org/10.1107/s0021889892005211.

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The detective quantum efficiency (DQE) characterizes the measurement uncertainty introduced by a detector. A formulation of the DQE for CCD and vidicon-based X-ray integrating detectors is developed and illustrated with five model detectors. A comparison of the calculated and measured DQEs for two of these detectors is presented. From an examination of the DQEs for the model detectors, generalizations are made regarding detector designs.
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Fabiszewska, Ewa, Anna Wysocka, Magdalena Dobrzyńska, Witold Skrzyński, and Katarzyna Pasicz. "Application of DQE for quantitative assessment of detectors to estimate AEC efficiency in digital mammography." Polish Journal of Medical Physics and Engineering 27, no. 1 (March 1, 2021): 51–56. http://dx.doi.org/10.2478/pjmpe-2021-0007.

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Abstract Optimisation of the detector’s exposure parameters settings for image quality and patient dose is an important task in digital mammography. Assessment of a digital detector’s performance can be done objectively and without operator bias by determining the Detective Quantum Efficiency (DQE). The authors of this article aim to prove that the performance of the AEC system can be objectively portrayed through DQE. The results were examined for influence of KAD changes on DQE values and to determine if it was possible to obtain similar DQE values for different exposures. While analysing the effect of the operation of the AEC system described with DQE, the doses received by women during mammography examinations were considered, as well. The AEC system’s exposure control mechanism cannot guarantee the same DQE value for different object thicknesses. When the object thickness increases, the AEC system should increase the KAD value to obtain the same DQE value. The result of increasing KAD would be the increase of mean glandular dose for some women. However, assuming that DQE is a good indicator of image quality, introducing the proposed changes to the AEC system’s operation would result in the same image quality for all breast thicknesses. This approach to DQE use for AEC system evaluation is independent of the image processing procedure and can be the basis for changes to system calibration done by the manufacturer’s technical support team.
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Tam, T. V., D. V. Dong, D. V. Lam, T. H. Anh, N. D. Van, D. M. Trung, T. D. Duong, K. H. Trung, N. T. Duong, and Tran Dang Khanh. "Identification of Vietnamese Native Rhododendron and Enkianthus Species of Ericaceae Family Based on Ribosomal DNA Internal Transcribed Spacer (ITS) Sequence." Journal of Horticulture and Plant Research 2 (May 2018): 33–42. http://dx.doi.org/10.18052/www.scipress.com/jhpr.2.33.

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The genusRhododendronandEnkianthusare belonging theEricaceaefamily. In Vietnam there have diversified with 12 genera and about 90 species, of which morerhododendrons30 species with beautiful flowers and two ofEnkianthusspecies, widely distributed across the regions of the country. In this study, twelve Vietnamese nativeRhododendronandEnkianthusspecies collected from Quang Ninh province were identified based on sequences of the internal transcribed spacer (ITS) regions of nuclear ribosomal DNA. Comparison on sequencing among 12 Vietnamese nativeRhododendronandEnkianthuswith world'sRhododendronandEnkianthusspecies, we have determined the accurate same pattern the 5/10 species by recognition molecule forms such as DQ2, DQ5, DQ6, DQ7, DQ8 and five species as DQ1, DQ9, DQ10, DQ11 and DQ12 were determined in genusRhododendronspecies. Two varieties ofEnkianthusas DQ3 and DQ4 were identified asEnkianthus quinqueflorus. Although the species is still limited but the ITS sequences application revealed the strength of promotion of universal DNA barcode in the delimitation of species and subspecies level for plant group flowering.
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Kano, Akiko. "Detective Quantum Efficiency (DQE)." Japanese Journal of Radiological Technology 66, no. 1 (2010): 88–93. http://dx.doi.org/10.6009/jjrt.66.88.

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Rinkel, Jean, Debora Magalhães, Franz Wagner, Florian Meneau, and Flavio Cesar Vicentin. "Detective quantum efficiency for photon-counting hybrid pixel detectors in the tender X-ray domain: application to Medipix3RX." Journal of Synchrotron Radiation 23, no. 1 (January 1, 2016): 206–13. http://dx.doi.org/10.1107/s1600577515020226.

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Synchrotron-radiation-based X-ray imaging techniques using tender X-rays are facing a growing demand, in particular to probe theKabsorption edges of low-Zelements. Here, a mathematical model has been developed for estimating the detective quantum efficiency (DQE) at zero spatial frequency in the tender X-ray energy range for photon-counting detectors by taking into account the influence of electronic noise. The experiments were carried out with a Medipix3RX ASIC bump-bonded to a 300 µm silicon sensor at the Soft X-ray Spectroscopy beamline (D04A-SXS) of the Brazilian Synchrotron Light Laboratory (LNLS, Campinas, Brazil). The results show that Medipix3RX can be used to develop new imaging modalities in the tender X-ray range for energies down to 2 keV. The efficiency and optimal DQE depend on the energy and flux of the photons. The optimal DQE values were found in the 7.9–8.6 keV photon energy range. The DQE deterioration for higher energies due to the lower absorption efficiency of the sensor and for lower energies due to the electronic noise has been quantified. The DQE for 3 keV photons and 1 × 104 photons pixel−1s−1is similar to that obtained with 19 keV photons. Based on our model, the use of Medipix3RX could be extended down to 2 keV which is crucial for coming applications in imaging techniques at modern synchrotron sources.
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HATANAKA, YOICHI. "Direct Radiography : DQE & MTF." Japanese Journal of Radiological Technology 55, no. 8 (1999): 742–44. http://dx.doi.org/10.6009/jjrt.kj00001356710.

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Cho, Min Kook, Ho Kyung Kim, Thorsten Graeve, and Jung Min Kim. "Characterization of CMOS Pixel Detectors for Digital X-Ray Imaging." Key Engineering Materials 321-323 (October 2006): 1052–55. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.1052.

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In order to develop a cost-effective digital X-ray imaging system, we considered a CMOS (complementary metal-oxide-semiconductor) photodiode array in conjunction with a scintillation screen. Imaging performance was evaluated in terms of MTF (modulation-transfer function), NPS (noise-power spectrum) and DQE (detective quantum efficiency). The presampled MTF was measured using a slanted-slit method. The NPS was determined by 2-dimensional Fourier analysis. Both the measured MTF and NPS, and a self-developed computational model for the X-ray spectral analysis were used to determine the spatial frequency-dependent DQE. From the measured MTF, the spatial resolution was found to be about 10.5 line pairs per millimeter (lp/mm). For a 45-kVp tungsten spectrum, the measured DQE around zero spatial frequency was about 40%.
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Buijsse, Bart, Piet Trompenaars, Veli Altin, Radostin Danev, and Robert M. Glaeser. "Spectral DQE of the Volta phase plate." Ultramicroscopy 218 (November 2020): 113079. http://dx.doi.org/10.1016/j.ultramic.2020.113079.

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Deliiski, Nencho, Neno Trichkov, Dimitar Angelski, and Ladislav Dzurenda. "Numerical Approach for Computation of the Heat and Heat Flux for Covering of the Emission in the Surrounding Air of Subjected to Unilateral Heating Flat Wood Details before their Bending." Key Engineering Materials 688 (April 2016): 153–59. http://dx.doi.org/10.4028/www.scientific.net/kem.688.153.

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A numerical approach for the computation of the specific (for 1 m2) energy consumption, qe, and the specific heat flux, dqe/dτ, needed for covering of the emission in the surrounding environment of the subjected to unilateral heating flat wood details aimed at their plasticizing and following bending has been suggested. The approach is based on the integration and differentiation of the solutions of a linear model for the calculation of the non-stationary 1D temperature distribution along the thickness of subjected to unilateral heating flat wood details, suggested by the authors earlier.For the numerical solution of the model aimed at the determination of qe and dqe/dτ software program has been prepared, which was input in the calculation environment of Visual Fortran. Using the program, computations have been carried out for the determination of the change in the energy qe and in the flux dqe/dτ, which are consumed by spruce details with an initial temperature of 20 °C, moisture content of 0.15 kg·kg-1, and thicknesses of 6 mm, 8 mm, and 10 mm during their 10 min unilateral heating at temperatures of the heating metal band of 100 °C, 120 °C, and 140 °C and of the surrounding air of 20 °C. The obtained results are graphically presented and analyzed.
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Takahashi, Noriyuki, Seisho Sasaki, Yohetsu Abe, Toshimitsu Sakuma, Mitsuo Katsumata, Toshihiro Ohhisa, Shigeru Abiko, and Hisayoshi Abe. "316. Measurement of DQE (u) of DSA system." Japanese Journal of Radiological Technology 46, no. 8 (1990): 1287. http://dx.doi.org/10.6009/jjrt.kj00003322438.

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Dissertations / Theses on the topic "DQE"

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Falco, Tony. "MTF, NPS and DQE analysis of portal metal-platefilm detectors." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23885.

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Previous studies of modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE) of metal-plate/film portal detectors have been performed on limited combinations of front and back metal-plates. We report on these parameters for an extensive set of forty-nine front-back metal-plate combinations. The portal detector consists of a double emulsion RP (Kodak localization therapy) film placed between metal-plates: Al, Cu, brass and Pb of thicknesses varying from 0.30 to 4.80 mm. Radiation sources included a Theratron Co-60 unit, and a Varian Clinac-18 linear accelerator delivering a polyenergetic 10 MV X-ray spectrum. In terms of the absolute efficiency of the detectors, the best DQE is obtained with the detector consisting of a 1.75 mm Cu front plate and a 1.62 mm Al back plate for the Clinac-18, and with the detector consisting of a 0.95 mm Cu front plate and a 0.80 mm Cu or a 1.62 mm Al back plate for the Co-60 gamma ray source.
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Johansson, Emanuel. "Relationen mellan designkvalitet och designintention : En tillämpning av design quality evaluation (DQE) i påbyggnadsprojekt." Thesis, Luleå tekniska universitet, Arkitektur och vatten, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-83438.

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Påbyggnation är en typ av hållbar stadsutveckling som blir allt vanligare i Sverige. Ett av de gemensamma målen vid påbyggnation, likt andra byggprojekt, är att uppnå en viss förbestämd kvalitet. Designkvalitet kan ses som en del av kvalitetsmålet. Problemet är att designkvalitet är svårdefinierat, ändå finns det ett behov av att mäta och hantera den här typen av värde, dels för kunden och samhället, dels för representanter i design- och byggprocessen. För att tillgodose behovet kan en utvärdering av designkvalitet vara en möjlig lösning. Ett av de senaste verktygen för detta är design quality evaluation (DQE) wheel, utvecklat av Eilouti (2020). Verktyget kan användas för att dra lärdom av projekt vilket blir särskilt viktigt i mindre utforskade områden, till exempel påbyggnation. Frågan är: hur uppnås designkvalitet? Forskning indikerar att arkitekten spelar en central roll. Arkitekten är den aktör som genom sina designintentioner ska se till att kundens mål och behov uppfylls. Däremot finns det få empiriska stöd för kopplingen mellan designintention och designkvalitet. Därför är det relevant att undersöka hur begreppen förhåller sig till varandra. Undersökningen kan ge insikt i hur designkvalitet uppnås, främst genom ökad förståelse för hur arkitektens designintentioner påverkar det slutliga resultatet. För att säkerställa att designintentioner leder till uppnådd designkvalitet pekar forskning på att intentionerna måste kopplas till mätbara resultat. DQE kan vara en lösning som erbjuder dessa mätbara resultat. Examensarbetets syfte är att bidra med ökad förståelse för hur designkvalitet uppnås genom att undersöka relationen mellan designkvalitet och designintention. Undersökningen möjliggörs genom en tillämpning av DQE. Verktyget kan erbjuda den struktur som behövs för att erhålla arkitektens utvärdering av designkvalitet och ta reda på bakomliggande designintentioner. För att uppnå syftet används två primära metoder: först en litteraturundersökning, sedan en fallstudie. I den första delen jämförs och kontrasteras olika teoretiska synsätt på designkvalitet och designintention. Därefter föreslås en definition av begreppen som blir gällande i arbetets kontext. Arbetets andra del innebär en djupdykning i sju olika påbyggnadsprojekt där uppdragsansvarig eller handläggande arkitekt intervjuas. Intervjuerna genomförs för att erhålla arkitektens utvärdering av designkvalitet och ta reda på bakomliggande designintentioner. Resultatet analyseras i tre steg för att kunna dra slutsatser om relationen mellan designkvalitet och designintention. Litteraturundersökningen resulterar i två föreslagna definitioner. (Se avsnitt 3.1.4 respektive 3.3.4 för fullständiga definitioner.) Designkvalitet används i regel för att beskriva en byggnads goda egenskaper med avseende på design. Begreppet är svårdefinierat på grund av dess subjektiva karaktär och därmed omöjliga separation från personliga, samhällsenliga och kulturella förutsättningar. Designintention är en designers beskrivning av mål, syften eller orsaker bakom designrelaterade beslut. Designintentioner skapas utifrån en designers tolkning av kundens prioriterade mål. Resultatet blir därför en kombination av designerns och kundens värderingar. Fallstudien visar att estetik, stads- & miljömässig lämplighet samt identitet & karaktär är de parametrar som prioriteras högst av arkitekterna. Samma parametrar leder även till högst designkvalitet i arkitekternas utvärderingar. Resultatet talar för att arkitekternas prioriterade designintentioner tenderar att resultera i uppnådd designkvalitet. Det betyder att relationen mellan designkvalitet och designintention existerar och att arkitekten är nyckelpersonen i sammanhanget. Analysen indikerar att relationen utgörs av en problemlösande process där arkitekten ansvarar för att säkerställa att designintentionerna leder till uppnådd designkvalitet. Processen är känslig eftersom den påverkas av kundens vilja och arkitektens förmåga att tillämpa sina designintentioner i praktiken. Examensarbetet belyser vikten av arkitektens arbete från intention till slutlig produkt eftersom det kan främja designkvalitet i den färdiga byggnaden. Avgränsningen till påbyggnadsprojekt bidrar till att vidga tillämpningsområdet för designkvalitet och designintention. Tillämpningen av DQE var en förutsättning för examensarbetets genomförande. Däremot kan det argumenteras för att verktyget gör större nytta som diskussionsunderlag än för att kvantifiera designkvalitet.
Vertical extensions of buildings are a type of sustainable urban development with increasing occurrence in Sweden. One of the commonly held goals when vertically extending a building, as in other construction projects, is to achieve a certain pre-determined quality. Design quality can be seen as a part of the quality goal. The problem is that design quality is difficult to define, still there is a need for measuring and managing this type of value, not only for the client and society, but also for actors within the design and building process. To satisfy the need an evaluation of design quality might be a possible solution. One of the most recent tools for this is the design quality evaluation (DQE) wheel, developed by Eilouti (2020). The tool can be used to learn lessons from a project which is especially important in less researched areas, e.g. vertical extensions of buildings. The question is: how is design quality achieved? Research indicates that the architect plays a crucial role. The architect is the actor who through their design intentions should ensure that the clients’ goals and needs are fulfilled. However, there are few empirical studies supporting the connection between design intentions and design quality. That is why it is relevant to examine how these concepts relate to one another. The examination can provide insight into how design quality is achieved, mainly by increased understanding of how the architects’ design intentions are affecting the result. To ensure that the design intentions lead to achieved design quality research imply that the intentions must be connected to testable outcomes. DQE might be a solution providing these testable outcomes.  The purpose of this master thesis is to contribute with increased understanding of how design quality is achieved by examining the relation between design quality and design intention. The examination is enabled due to the application of DQE. The tool can offer a structure for acquiring the architect’s evaluation of design quality and finding out the underlying design intentions. To achieve the purpose two primary methods are being used: first a literature review, then a case study. The first part compares different theoretical viewpoints on design quality and design intention. Thereafter two definitions are proposed which are applicable within the context of this thesis. The second part takes a deeper dive into seven different vertical extension projects where each responsible architect is interviewed. The interviews are conducted to acquire the architect’s evaluation of design quality and to find out the underlying design intentions. The results are analysed in three stages in order to make conclusions about the relation between design quality and design intention.  The literature review results in two proposed definitions. (See section 3.1.4 and 3.3.4 for the complete Swedish definitions.) Design quality is often used to describe a building’s good properties regarding design. The concept is difficult to define because of its subjective nature and therefore impossible separation from personal, societal, and cultural conditions. Design intention is a designer’s description of goals, purposes or reasons behind design related decisions. Design intentions are based on a designer’s interpretation of the client’s prioritised goals. The result is therefore a combination of the designer’s and the client’s values. The case study shows that aesthetics, urban & environmental fit, and identity & character are the parameters which the architects prioritise the highest. The same parameters lead to the highest design quality according to the architects’ evaluations. The results show that the architects’ prioritised design intentions tend to lead to achieved design quality. This means that the relation between design quality and design intention exists and that the architect is the key person in this context. The analysis indicates that the relation consists of a problem-solving process where the architect is responsible of ensuring that the design intentions lead to achieved design quality. The process is sensitive because it is affected by the client’s will and the architect’s ability to apply their design intentions in practise.  This thesis highlights the importance of the architect’s work from intention to product because it can favour the design quality of the finished building. The demarcation to vertical extensions of buildings contribute to widen the areas of applicability for design quality and design intention. The application of DQE was a prerequisite for the realisation of this thesis. However, it can be argued that the tool is better used as a basis for discussion rather than to quantify design quality.
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Geoghegan, Mark, and Robert Schumacher. "PERFORMANCE RESULTS USING DATA QUALITY ENCAPSULATION (DQE) AND BEST SOURCE SELECTION (BSS) IN AERONAUTICAL TELEMETRY ENVIRONMENTS." International Foundation for Telemetering, 2017. http://hdl.handle.net/10150/627011.

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Flight test telemetry environments can be particularly challenging due to RF shadowing, interference, multipath propagation, antenna pattern variations, and large operating ranges. In cases where the link quality is unacceptable, applying multiple receiving assets to a single test article can significantly improve the overall link reliability. The process of combining multiple received streams into a single consolidated stream is called Best Source Selection (BSS). Recent developments in BSS technology include a description of the maximum likelihood detection approach for combining multiple bit sources, and an efficient protocol for providing the real-time data quality metrics necessary for optimal BSS performance. This approach is being standardized and will be included in Appendix 2G of IRIG-106-17. This paper describes the application of this technology and presents performance results obtained during flight testing.
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Adya, Vandana. "Detection of Signal Parameters and Backscattering Polarimetric Imaging Signatures using Molecular Optical Contrast Agents and Preclinical Liquid Phantoms." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1225204620.

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Robert, Charlotte. "Optimisation de l'architecture HiSens, une nouvelle architecture de gamma-caméra CdZnTe haute sensibilité pour l'imagerie clinique." Paris 11, 2010. http://www.theses.fr/2010PA112232.

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Dans le but de dépasser le compromis résolution spatiale/sensibilité des gamma-caméras d'Anger, l'architecture HiSens est étudiée depuis plusieurs années. Cette architecture, basée sur l'utilisation d'un détecteur semi-conducteur CdZnTe, exploite la localisation 3D précise des interactions au sein du détecteur. Cette thèse s'inscrit dans ce cadre. Tout d'abord, une méthodologie de quantification de la qualité du volume reconstruit est mise en place. Cette étape permet de valider en mode planaire, par la simulation ainsi que par l'expérience, les intérêts potentiels de l'architecture. Afin d'en optimiser les paramètres, un outil de calcul de DQE (Detective Quantum Efficiency), adapté à l'imagerie gamma, est développé en mode d'acquisition planaire. Une optimisation de l'ouverture du collimateur pour deux applications, cardiaque et scintimammographique, est réalisée. Elle montre qu'un gain supérieur à un facteur 3 en sensibilité peut être obtenu pour une distance source-collimateur de 5 cm, à résolution identique voire meilleure, grâce à l'architecture HiSens. Dans le cadre de cette étude, le paramètre distance collimateur-détecteur est ajusté. Ce paramètre, qui permet un gain notable en qualité image pour les objets hautes fréquences, fait aujourd'hui l'objet d'un brevet et d'une validation expérimentale. Finalement, un programme de calcul de DQE en mode tomographique est développé. Celui-ci permet de caractériser, par exemple, la variation des performances dans le champ de vue. Grâce à ce programme, une méthodologie d'optimisation des caractéristiques système pour l'application cardiaque en mode tomographique est introduite. Elle clôture ces travaux de thèse
To overcome the Anger camera spatial resolution/sensitivity trade-off, the HiSens architecture has been studied for several years. This architecture, based on pixelated CZT detectors, takes advantage of the accurate 3D localization of the interactions inside the detector. This work is dedicated to this architecture. First, a quantification methodology is introduced. This step allows preliminary simulation-based and experimental evaluation of the architecture in planar acquisition mode. A DQE (Detective Quantum Efficiency) calculation tool, aiming at optimizing the HiSens parameters in planar acquisition mode, is then proposed and used for two applications (cardiac imaging and scintimammography). Lt shows that, considering a 5 cm source-collimator distance, the system sensitivity can be increased by 3 while maintaining or improving the spatial resolution thanks to the HiSens architecture. Ln this study, the collimator-to-detector distance parameter is made scalable. We show that its adjustment can advantageously increase the high frequency content of the reconstructed images. The effect of this parameter is experimentally validated in this work and has been besides patented. Finally, a SPECT DQE calculation tool is developed. This one, permitting to describe the system performances inside the field-of-view, is used, at the end of the work, to suggest a methodology allowing to determine the optimal collimation parameters for cardiac SPECT applications
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Maschio, Maria Celeste. "Performance evaluation of detector for digital radiography." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8317/.

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Lo scopo di questo lavoro è la caratterizzazione fisica del flat panel PaxScan4030CB Varian, rivelatore di raggi X impiegato in un ampio spettro di applicazioni cliniche, dalla radiografia generale alla radiologia interventistica. Nell’ambito clinico, al fine di una diagnosi accurata, è necessario avere una buona qualità dell’immagine radiologica mantenendo il più basso livello di dose rilasciata al paziente. Elemento fondamentale per ottenere questo risultato è la scelta del rivelatore di radiazione X, che deve garantire prestazioni fisiche (contrasto, risoluzione spaziale e rumore) adeguati alla specifica procedura. Le metriche oggettive che misurano queste caratteristiche sono SNR (Signal-to-Noise Ratio), MTF (Modulation Transfer Function) ed NPS (Noise Power Spectrum), che insieme contribuiscono alla misura della DQE (Detective Quantum Efficiency), il parametro più completo e adatto a stabilire le performance di un sistema di imaging. L’oggettività di queste misure consente anche di mettere a confronto tra loro diversi sistemi di rivelazione. La misura di questi parametri deve essere effettuata seguendo precisi protocolli di fisica medica, che sono stati applicati al rivelatore PaxScan4030CB presente nel laboratorio del Centro di Coordinamento di Fisica Medica, Policlinico S.Orsola. I risultati ottenuti, conformi a quelli dichiarati dal costruttore, sono stati confrontati con successo con alcuni lavori presenti in letteratura e costituiscono la base necessaria per la verifica di procedure di ottimizzazione dell’immagine radiologica attraverso interventi sul processo di emissione dei raggi X e sul trattamento informatico dell’immagine (Digital Subtraction Angiography).
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Jin, Xiance. "Evaluation of Large Area Polycrystalline CdTe Detector for Diagnostic X-ray Imaging." University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1310069769.

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Acharian, Georges. "Modélisation de la détection de défauts et perception de la qualité d'images radiologiques." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT065.

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Depuis la fin du 20ème siècle, l'imagerie médicale s'est fortement développée et représente aujourd'hui un moyen incontournable pour le diagnostic médical. Dans le domaine de la radiologie par rayons X, de nouveaux détecteurs numériques remplacent progressivement les anciennes techniques à film et permettent d'obtenir des images de meilleure qualité. Cette thèse, préparée en collaboration entre l'entreprise Trixell, constructeur de détecteurs plats numériques pour la radiographie, et le laboratoire Gipsa-Lab, s'inscrit dans le cadre général du contrôle qualité de ces détecteurs par analyse d'images. Les applications biomédicales mettant en jeu ces appareils, sont généralement particulièrement sensibles, et le principe de « zéro défaut » est de mise quant à la qualité des produits. Malgré les différents traitements, certains défauts peuvent être présents dans les images. Cette thèse est axée sur le développement de modèles de mesure de la visibilité des défauts, en cohérence avec l'observation d'un humain. Deux approches complémentaires sont développées : la première approche basée sur des expériences psychophysiques et la seconde approche de modélisation basée sur la théorie de décision. Par rapport aux modèles de visibilité existants, notre modèle prend en compte la perception humaine et notamment les saccades et fixations oculaires dans l'analyse des images : le test de visibilité est ainsi le produit de tests de visibilité locaux, calculés aux points saillants de l'image supposés indépendants. Les résultats montrent l'intérêt de notre approche, notamment pour des détecteurs statiques. En se fondant sur les résultats et une dernière expériences d'oculométrie, cette thèse suggère en perspective la prise en compte d'autres caractéristiques comme le nombre de fixations oculaires, et leur durée
Since the beginning of the 20th century, medical imaging has significantly been improved and represents now an essential mean for medical diagnosis. In the field of radiology, new digital detectors are gradually replacing the old film techniques allowing a better image. This thesis, prepared in collaboration between the company Trixell, manufacturer of X-ray detectors, and the laboratory Gipsa-Lab, is part of the framework of quality control of these detectors by image analysis. Biomedical applications involved by these devices are particularly sensitive, and the principle of “zero artifact” is required to ensure the quality of the product. Despite the various processings, some artifacts may be present in the images.This thesis focuses on the development of models that quantify the visibility of artifacts in concordance to human observation. Two complementary approaches are developed : the first one is based on psychophysical experiments and the second one is a modeling approach based on decision theory. In comparison to existent models, our model takes into account perception characteristics including saccades and eye fixation in image analysis : the visibility test is thus the product of local visibility tests calculated on the salient points of the image and assumed to be independent. The results show the interest of our approach, especially for static detectors. Based on the results and a final eye-tracking experiment, this thesis suggests perspectives taking into account other characteristics such as the number of eye fixations and their duration
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Monteiro, Samuel Godinho. "Características de desempenho do MPGD THCOBRA a operar em Ar/CH4." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/16573.

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Mestrado em Tecnologias da Imagem Médica
Os detetores de radiação representam um dos componentes principais dos equipamentos de imagiologia, tendo como principal função o registo da intensidade do feixe de raios X após atenuação, fundamental para a posterior criação da imagem. Desde o desenvolvimento da película radiográfica, a evolução dos detetores de radiação tem sido progressiva, implementando-se diferentes materiais e técnicas na deteção de raios X com o objetivo de produção de imagens mais eficiente, com maior qualidade, reduzido tempo de exposição e menor dose de radiação no paciente. O detetor gasoso microestruturado (MicroPattern Gaseous Detector – MPGD) baseado na estrutura Thick-COBRA (THCOBRA) já mostrou, como publicado na literatura, as suas potencialidades em imagiologia por transmissão de raios X. Apesar disto, e olhando ao facto de este ser um detetor desenvolvido recentemente, não existem estudos quanto às suas características de desempenho. Daí levanta-se a seguinte questão problema que impulsionou este trabalho: “Quais são as características de desempenho de um MPGD baseado na THCOBRA?”. O objetivo do trabalho é então estudar as características de desempenho do MPGD THCOBRA a operar em Ar/CH4 (95/5) para imagiologia por transmissão de raios X, avaliando os parâmetros de resolução espacial, a Modulation Transfer Function (MTF), o Noise Power Spectrum (NPS), Detective Quantum Efficiency (DQE), ganho em carga, resolução em energia, uniformidade e relação sinal ruído (SNR). Serão ainda exploradas as potencialidades deste detetor, usando a informação em energia para obter diferentes tipos de imagem. O estudo foi realizado no laboratório do grupo de Deteção de Radiação e Imagiologia Médica (DRIM) do I3N sediado no Complexo Interdisciplinar de Ciências Físicas Aplicadas à Nanotecnologia e à Oceanografia (CICFANO) da Universidade de Aveiro, com recurso a uma ampola de raios X e um MPGD com a estrutura THCOBRA. Para estudar as características de desempenho do detetor, foram adquiridos os dados necessários em laboratório e de seguida avaliado cada um dos parâmetros de qualidade com base nos métodos existentes na literatura, adaptados para este caso concreto, visto não existirem métodos específicos para o detetor em causa. Tendo como base a literatura já publicada sobre este detetor, são limitadas as previsões acerca dos resultados esperados das características de desempenho, tendo-se conhecimento de que estes serão inferiores aos detetores de radiação usados atualmente em imagiologia. Os resultados obtidos estiveram de acordo com as previsões, mas além disso revelam que este detetor tem potencialidades para criação de imagens por transmissão cuja qualidade pode ser otimizada futuramente.
Radiation detectors are one of the main components of imaging equipment, having the main function of registering the intensity of X-ray beam after attenuation, fundamental for the subsequent creation of the image. Since the development of radiographic film, the evolution of the radiation detectors has been progressive, by implementing different materials and techniques on the X-rays detection with the purpose of more efficient production of images with higher quality, reduced time of exposure and lower radiation dose in the patient. Micro Pattern Gaseous Detector (MPGD) based on Thick-COBRA structure (THCOBRA) has shown, as published in the literature, its potential for imaging by X-ray transmission. Despite this, and looking at the fact that this is a newly developed detector, there are no studies as to its performance characteristics. From there arises the question problem which boosted this work: "Which are the performance characteristics of a MPGD based on a THCOBRA?". This study aims to examine the performance characteristics of MPGD THCOBRA operating in Ar/CH4 (95/5) for imaging by X-ray transmission, evaluating the parameters of spatial resolution, Modulation Transfer Function (MTF), Noise Power Spectrum (NPS), Detective Quantum Efficiency (DQE), charge gain, energy resolution, uniformity and signal noise ratio (SNR). Also, will be explored the potential of this detector, using energy information to achieve different types of images. The study was conducted in the laboratory of Radiation Detection and Medical Imaging Group (DRIM) of I3N in the CICFANO at University of Aveiro, using an X-ray tube and a MPGD with a THCOBRA structure. To examine the detector performance characteristics the necessary data was acquired in the laboratory and then evaluated each quality parameter based on existing methods in the literature, adapted for this case, since there are no specific methods for the involved detector. Based on the published literature about this detector, the predictions are limited regarding the expected results of the performance characteristics, having knowledge that these will be lower than the radiation detectors currently used in medical imaging. The results were in line with the predictions, but additionally shown that this detector has the potential to create transmission images whose quality can be improved in the future.
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10

Papajová, Gabriela. "Obrazové detektory rentgenového záření pro aplikace v microCT systémech." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316801.

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Diplomová práce se zabývá detektory rentgenového záření pro mikro-CT systémy. Teoretická část zahrnuje standartní typy rentgenových detektorů a požadavky na kvalitu obrazu pro výslednou 3D rekonstrukci. V závěru jsou popsány fyzikální parametry reálných detektorů a metody jejich měření a vyhodnocení.
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Books on the topic "DQE"

1

Qesari, Andon. Unë, ti dhe teatri: (dje, sot dhe nesër). Tiranë: AQSHF, 2012.

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Mehl, Horst. DCE: Sicherheit für die Praxis. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72227-1.

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Groth, Siegfried. Namibië, die muur van swye: Die donker dae van die bevrydingstryd. Windhoek, Namibia: EIN Publications, University of Namibia, 1996.

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McKinlay, Jenn. Due or die: A library lover's mystery. Thorndike, Me: Center Point Pub., 2012.

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Kusche, Michael Silvio. Die aktienrechtliche Zulässigkeit der Durchführung einer Due Diligence anlässlich eines Unternehmenskaufes: Mit Due Diligence-Checkliste für die Zielgesellschaft. Frankfurt a.M: P. Lang, 2005.

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Schwieger, Peter. Die ersten dGe-lugs-pa-Hierarchen von Brag-g.yab (1572-1692). Bonn: VGH Wissenschaftsverlag, 1989.

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Zirngibl, Nikolas. Die Due Diligence bei der GmbH und der Aktiengesellschaft: Die Geschäftsführungsorgane im Konflikt zwischen Geheimhaltung und Informationsoffenlegung. Berlin: Rhombos, 2003.

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Amadeus, Mozart Wolfgang. Die Zauberflöte: Il flauto magico : KV. 620 : opera tedesca in due atti. Milano]: Edizioni del Teatro alla Scala, 1986.

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Stuckey, Stephen. Definitely Dee Dee: The Dee Dee Warwick story. Toronto: Eastbound Books, 2003.

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Ferreira, Jeanette. Die mammies, die pappies, die hondjies, die katjies. Bramley: Taurus, 1989.

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Book chapters on the topic "DQE"

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Speer, Tod W., Christin A. Knowlton, Michelle Kolton Mackay, Charlie Ma, Lu Wang, Larry C. Daugherty, Brandon J. Fisher, et al. "Detective Quantum Efficiency (DQE)." In Encyclopedia of Radiation Oncology, 156. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-540-85516-3_425.

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Ayala, R., R. Linares, and R. García-Mollá. "MIQuaELa, Software for DQE Measuring in DIGITAL Radiography/Mammography." In IFMBE Proceedings, 825–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03879-2_230.

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García-Mollá, R., R. Linares, and R. Ayala. "A Study of DQE Dependence with Beam Quality, GE Senographe Essential Detector for Mammography." In IFMBE Proceedings, 886–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03879-2_248.

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Fang, Yuan, Andreu Badal, Karim S. Karim, and Aldo Badano. "Monte Carlo Modeling of the DQE of a-Se X-Ray Detectors for Breast Imaging." In Breast Imaging, 387–93. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07887-8_54.

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Nishikawa, Robert M. "The Effect of Scatter Radiation and its Removal on the DQE of Digital Mammography Systems." In Digital Mammography, 59–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59327-7_13.

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Acciavatti, Raymond J., and Andrew D. A. Maidment. "Calculation of OTF, NPS, and DQE for Oblique X-Ray Incidence on Turbid Granular Phosphors." In Digital Mammography, 436–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13666-5_59.

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Friedrich, Alfred. "Die Due Diligence." In Erfolgreicher Unternehmensverkauf, 105–13. Wiesbaden: Gabler Verlag, 1998. http://dx.doi.org/10.1007/978-3-322-90958-9_9.

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Kecker, Dieter. "Die steuerliche Due Diligence." In Due Diligence in der Praxis, 91–109. Wiesbaden: Gabler Verlag, 2002. http://dx.doi.org/10.1007/978-3-322-94397-2_4.

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Mehl, Horst. "Die konkrete DCE-Infrastruktur." In DCE: Sicherheit für die Praxis, 63–104. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72227-1_3.

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Zai, Alexander, and Brandon Brown. "Verteilungs-DQN: Die ganze Geschichte." In Einstieg in Deep Reinforcement Learning, 181–224. München: Carl Hanser Verlag GmbH & Co. KG, 2020. http://dx.doi.org/10.3139/9783446466081.007.

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Conference papers on the topic "DQE"

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Airey, Robert J., Timothy J. Norton, Brian L. Morgan, John L. A. Fordham, David A. Bone, and J. R. Powell. "MCP image intensifier with improved DQE." In SC - DL tentative, edited by Illes P. Csorba. SPIE, 1990. http://dx.doi.org/10.1117/12.19474.

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Shaw, Rodney. "DQE analysis for CCD imaging arrays." In Medical Imaging 1997, edited by Richard L. Van Metter and Jacob Beutel. SPIE, 1997. http://dx.doi.org/10.1117/12.273977.

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Shaw, Chris C., Xingming Liu, Sophie Chardon, and John M. Herron. "Frequency-dependent DQE in dual-screen CR imaging." In Medical Imaging '98, edited by James T. Dobbins III and John M. Boone. SPIE, 1998. http://dx.doi.org/10.1117/12.317074.

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Zelakiewicz, Scott, and Jeffrey Shaw. "Modeling MTF and DQE for Arbitrary Scintillator Thickness." In 2006 IEEE Nuclear Science Symposium Conference Record. IEEE, 2006. http://dx.doi.org/10.1109/nssmic.2006.354429.

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Roehrig, Hans, William V. Schempp, Michael A. Damento, Alonzo Pickett, Wayne Maher, and Hugh Garvey. "DQE of imaging detectors for application in crystallography." In SPIE Optical Engineering + Applications, edited by F. Patrick Doty, H. Bradford Barber, Hans Roehrig, and Richard C. Schirato. SPIE, 2009. http://dx.doi.org/10.1117/12.830041.

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Samei, Ehsan, Michael J. Flynn, Harrell G. Chotas, and James T. Dobbins III. "DQE of direct and indirect digital radiography systems." In Medical Imaging 2001, edited by Larry E. Antonuk and Martin J. Yaffe. SPIE, 2001. http://dx.doi.org/10.1117/12.430953.

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Izumi, N., G. N. Hall, A. C. Carpenter, F. V. Allen, J. G. Cruz, B. Felker, D. Hargrove, et al. "Demonstration of enhanced DQE with a dual MCP configuration." In SPIE Optical Engineering + Applications, edited by Perry M. Bell and Gary P. Grim. SPIE, 2014. http://dx.doi.org/10.1117/12.2063304.

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Abel, Eric, Mingshan Sun, Dragos Constanin, Rebecca Fahrig, and Josh Star-Lack. "User-friendly, ultra-fast simulation of detector DQE(f)." In SPIE Medical Imaging, edited by Robert M. Nishikawa and Bruce R. Whiting. SPIE, 2013. http://dx.doi.org/10.1117/12.2008411.

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Jennings, Robert J., and Aldo Badano. "Effect on DQE of screen energy weighting in mammography." In Medical Imaging 2003, edited by Martin J. Yaffe and Larry E. Antonuk. SPIE, 2003. http://dx.doi.org/10.1117/12.480198.

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Takamura, Miho, Akiko Higaki, and Yoshie Kodera. "Analysis of factors that affect DQE in digital mammography." In Medical Imaging, edited by Michael J. Flynn. SPIE, 2005. http://dx.doi.org/10.1117/12.595038.

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Reports on the topic "DQE"

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Disterhaupt, Jennifer, Michael James, and Marc Klasky. (U) Endpoint Energy and Scintillator Geometry Effects on the Swank Factor, Quantum Efficiency, and DQE(0) for High-Energy Radiography. Office of Scientific and Technical Information (OSTI), September 2020. http://dx.doi.org/10.2172/1660571.

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Disterhaupt, Jennifer, Michael James, and Marc Klasky. (U) Segmented Scintillator Pitch, Thickness, and Septa Material Effects on the Swank Factor, Quantum Efficiency, and DQE(0) for High-Energy X-Ray Radiography. Office of Scientific and Technical Information (OSTI), March 2021. http://dx.doi.org/10.2172/1770096.

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Gibbs, Michelle. FINAL Report LTC-DOE DE-EE0000537. Office of Scientific and Technical Information (OSTI), February 2013. http://dx.doi.org/10.2172/1226902.

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Mankoff, David A. Final Report for DOE Grant DE-SC0012476. Office of Scientific and Technical Information (OSTI), December 2018. http://dx.doi.org/10.2172/1484888.

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Wieder, William. Final SF-425 DOE Award#: DE-SC0014374. Office of Scientific and Technical Information (OSTI), October 2018. http://dx.doi.org/10.2172/1479107.

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Betti, Riccardo. Final Report. Grant DOE DE-FG02-04ER54768. Office of Scientific and Technical Information (OSTI), January 2016. http://dx.doi.org/10.2172/1234523.

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Dear, Jody. Final Technical Report – DOE Grant DE-SC0005904. Office of Scientific and Technical Information (OSTI), October 2013. http://dx.doi.org/10.2172/1259716.

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Chang, Spencer. Final Report for DOE Grant DE-SC0009945. Office of Scientific and Technical Information (OSTI), June 2016. http://dx.doi.org/10.2172/1257275.

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James R. Chelikowsky. FINAL REPORT DOE Grant: DE-FG02-89ER45391. Office of Scientific and Technical Information (OSTI), February 2009. http://dx.doi.org/10.2172/948116.

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Newman, Harvey B., Jean-Roch Vlimant, Justas Balcas, and Shashwitha Puttaswamy. FINAL Technical Report DOE Award DE-SC0015527. Office of Scientific and Technical Information (OSTI), February 2019. http://dx.doi.org/10.2172/1593835.

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