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Littérature scientifique sur le sujet « K-edge subtraction »

Auteur : Grafiati

Publié le 14 mars 2023

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Articles de revues sur le sujet "K-edge subtraction"

Suwa, Akio, Hiroshi Fukagawa, Kiwamu Suzuki, Shin Hasegawa, Masami Ando, Kazuyuki Hyodo, Masayoshi Akisada et al. « X-Ray K-Edge Subtraction Television System ». Japanese Journal of Applied Physics 27, Part 1, No. 10 (20 octobre 1988) : 1989–96. http://dx.doi.org/10.1143/jjap.27.1989.

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Fukagawa, Hiroshi, Chosaku Noda, Yoichi Suzuki, Shin Hasegawa, Masami Ando, Kazuyuki Hyodo, Katsuyuki Nishimura et al. « Real time K‐edge subtraction x‐ray imaging ». Review of Scientific Instruments 60, n^o 7 (juillet 1989) : 2268–71. http://dx.doi.org/10.1063/1.1140790.

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Akisada, M. « K-edge subtraction using synchrotron radiation for coronary angiography ». International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes 37, n^o 1 (janvier 1986) : 91–92. http://dx.doi.org/10.1016/0883-2889(86)90230-3.

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Zhang, H., Y. Zhu, B. Bewer, L. Zhang, M. Korbas, I. J. Pickering, G. N. George, M. Gupta et D. Chapman. « Comparison of iodine K-edge subtraction and fluorescence subtraction imaging in an animal system ». Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment 594, n^o 2 (septembre 2008) : 283–91. http://dx.doi.org/10.1016/j.nima.2008.06.030.

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Mayo, Sheridan C., Sam Y. S. Yang, Marina Pervukhina, Michael B. Clennell, Lionel Esteban, Sarah C. Irvine, Karen K. Siu, Anton S. Maksimenko et Andrew M. Tulloh. « Characterization of Darai Limestone Composition and Porosity Using Data-Constrained Modeling and Comparison with Xenon K-Edge Subtraction Imaging ». Microscopy and Microanalysis 21, n^o 4 (29 mai 2015) : 961–68. http://dx.doi.org/10.1017/s1431927615000653.

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AbstractData-constrained modeling is a method that enables three-dimensional distribution of mineral phases and porosity in a sample to be modeled based on micro-computed tomography scans acquired at different X-ray energies. Here we describe an alternative method for measuring porosity, synchrotron K-edge subtraction using xenon gas as a contrast agent. Results from both methods applied to the same Darai limestone sample are compared. Reasonable agreement between the two methods and with other porosity measurements is obtained. The possibility of a combination of data-constrained modeling and K-edge subtraction methods for more accurate sample characterization is discussed.

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Gillam, John E., Daniel Kitcher, Toby E. Beveridge, Stewart Midgley, Chris Hall et Rob A. Lewis. « K-edge subtraction using an energy-resolving position-sensitive detector ». Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment 604, n^o 1-2 (juin 2009) : 97–100. http://dx.doi.org/10.1016/j.nima.2009.01.133.

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Ueda, Ken, Keiji Umetani, Tohoru Takeda, Masayoshi Akisada, Teiichi Nakajima, Izumi Anno et Chiri Yamaguchi. « A cine K‐edge subtraction angiographic system for animal studies ». Review of Scientific Instruments 60, n^o 7 (juillet 1989) : 2272–75. http://dx.doi.org/10.1063/1.1140791.

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Clements, N., D. Richtsmeier, A. Hart et M. Bazalova-Carter. « Multi-contrast CT imaging using a high energy resolution CdTe detector and a CZT photon-counting detector ». Journal of Instrumentation 17, n^o 01 (1 janvier 2022) : P01004. http://dx.doi.org/10.1088/1748-0221/17/01/p01004.

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Abstract Computed tomography (CT) imaging with high energy resolution detectors shows great promise in material decomposition and multi-contrast imaging. Multi-contrast imaging was studied by imaging a phantom with iodine (I), gadolinium (Gd), and gold (Au) solutions, and mixtures of the three using a cadmium telluride (CdTe) spectrometer with an energy resolution of 1% as well as with a cadmium zinc telluride (CZT) detector with an energy resolution of 13%. The phantom was imaged at 120 kVp and 1.1 mA with 7 mm of aluminum filtration. For the CdTe data collection, the phantom was imaged using a 0.2 mm diameter x-ray beam with 96 ten-second data acquisitions across the phantom at 45 rotation angles. For the CZT detector, we had 720 projections using a cone beam, and the six detector energy thresholds were set to 23, 33, 50, 64, 81, and 120 keV so that three thresholds corresponded to the K-edges of the contrast agents. Contrast agent isolation methods were then examined. K-edge subtraction and novel spectrometric algebraic image reconstruction (SAIR) were used for the CdTe data. K-edge subtraction alone was used for the CZT data. Linearity plots produced similar R 2 values and slopes for all three reconstruction methods. Comparing CdTe methods, SAIR offered less noise than CdTe K-edge subtraction and better geometric accuracy at low contrast concentrations. CdTe contrast agent images of I, Gd, and Au offered less noise and greater contrast than the CZT images, highlighting the benefits of high energy resolution CdTe detectors for possible use in pre-clinical or clinical CT imaging.

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Bewer, Brian, Honglin Zhang, Ying Zhu, Limei Zhang, Graham N. George, Ingrid J. Pickering et Dean Chapman. « Development of a combined K-edge subtraction and fluorescence subtraction imaging system for small animals ». Review of Scientific Instruments 79, n^o 8 (août 2008) : 085102. http://dx.doi.org/10.1063/1.2964120.

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Anno, I., M. Akisada, T. Takeda, Y. Sugishita, M. Kakihana, S. Ohtsuka, K. Nishimura et al. « Animal experiments by K‐edge subtraction angiography by using SR (abstract) ». Review of Scientific Instruments 60, n^o 7 (juillet 1989) : 2330–31. http://dx.doi.org/10.1063/1.1140756.

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Thèses sur le sujet "K-edge subtraction"

MUCOLLARI, Irena. « K-edge filter subtraction technique used for mapping elemental distribution on paintings ». Doctoral thesis, Università degli studi di Ferrara, 2014. http://hdl.handle.net/11392/2388940.

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Abstract Several techniques exist for mapping the element pigments on painting using the synchrotron light or quasi monochromatic sources. K-edge subtraction technique is a well known technique and based on discontinuity in the attenuation coefficient due to photoelectric K-edge of the absorbing materials. A couple of filters with slightly different K -edge energies, if are with balanced thicknesses, can isolate spectra in a narrow energy band. Quasi monoenergetic X-rays with a spectral width Ek that is the difference in K-edge energies will be taken by subtracting images or spectral data. Thus by using filter foils with appropriate thicknesses with the K-edge absorption just below and above the K-edge energy of an element allows us evaluating the distribution of that element in whole painting. The aim of this thesis has been application of K-edge subtraction technique to determine pigment composition in paintings by using common X-ray sources with balanced filters. The K-edge digital subtraction technique actually is investigated for estimation of Cadmium element. By choosing the Silver Cadmium and Indium as filter materials with properly thickness and with K-edge energies very close to the Cadmium element, determination of cadmium content has been presented as qualitative and quantitative result. The technique is tested by using a RadEye200 CMOS sensor. Theoretical simulations considering the experimental setup of technique has been presented as preliminary investigation. Complementary analyses are preformed with micro X-ray fluorescence spectrometry (μXRF), in order to validate the technique for cadmium element with the same samples. Theoretical aspects of K-edge imaging, the algorithms used for elaboration of images, detailed information for cadmium pigments and samples tests, are described in first chapters. An evaluation of X-ray performance of RadEye200 CMOS sensor has been performed in terms of MTF, NPS and DQE. Preliminary theoretical simulation is performed to determine the range where KES imaging technique with balanced filters response linear with the element content in paintings. In chapter 5 after description of spectral characteristics of the tungsten X-ray tube with additional K-edge filtering, imaging and steps of elaborating images has been described. Determination of Cadmium element in its pigments it is performed by KES and Lehmann algorithm applied on digital images. Results obtained on different samples are presented by a couple of images, graphically, tabulated data, and discussed. In chapter 6 introduction in theoretical aspects of XRF spectrometry is presented. Measurements for sampling area of μXRF ArtaxBruker200 and for Cadmium content in same samples used for imaging are presented. In chapter 7 the results carry out from KES technique and XRF for cadmium element in different samples are compared. The comparison between KES and XRF technique performed with the same sampling area of two detection systems (CMOS sensor with SDD solid drift detector) on the same area of the test sample shows a very good correlation among them.

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di, trapani vittorio. « State-of-the-art setups for K-edge imaging ». Doctoral thesis, Università di Siena, 2021. http://hdl.handle.net/11365/1144523.

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Spectral imaging is an emerging area of X-ray imaging that includes all the techniques which exploit the energy-dependent absorption properties of the matter to either provide quantitative information about the scanned object or to discriminate different materials. Though the potentials of spectral imaging are well known for over many years, the interest on spectral techniques is rapidly increasing only in recent years due to the development and widespread of dedicated acquisition systems able to acquire simultaneous (or nearly simultaneous) X-ray images at different energies. In this context, the development of energy resolving X-ray photon counting detectors (XPCDs) and the increasing availability of synchrotron radiation can provide interesting solutions for spectral imaging applications such as e.g. the K-edge technique. This thesis presents the implementation and the optimization of two state-of-the art acquisition systems suitable for spectral imaging applications with particular interest on the K-edge technique. The first system is an acquisition setup for spectral Computed Tomography (CT) made by coupling a polychromatic source with an energy resolving XPCD implementing two energy thresholds. The work carried out with this setup concerned the thorough characterization of an innovative XPCD featuring a sharp energy resolution, the design of a dedicated image processing procedure to achieve high quality CT images and the development of an automated procedure to produce accurate 3D maps of a K-edge element within a sample. Moreover, to allow further optimization studies, a simulator able to reproduce X-ray images with energy resolving XPCDs has been modeled, developed and validated. The last part of this thesis presents the development and the implementation of an acquisition setup for spectral imaging at synchrotron sources based on bent-Laue crystal optics. The results achieved with a prototype setup optimized for energies around 20 keV are presented, the future developments of the technique are discussed.

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Kulpe, Stephanie Kim [Verfasser], Franz [Akademischer Betreuer] Pfeiffer, Jan Jakob [Gutachter] Wilkens et Franz [Gutachter] Pfeiffer. « K-edge subtraction and X-ray fluorescence imaging at the Munich Compact Light Source / Stephanie Kim Kulpe ; Gutachter : Jan Jakob Wilkens, Franz Pfeiffer ; Betreuer : Franz Pfeiffer ». München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1230061096/34.

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Chapitres de livres sur le sujet "K-edge subtraction"

Akisada, M., K. Umetani, T. Takeda, K. Ueda et T. Nakajima. « Detectability of K-edge Energy Subtraction Coronary Angiography by Iodine Filter Method Using Synchrotron Radiation ». Dans Computer Assisted Radiology / Computergestützte Radiologie, 796. Berlin, Heidelberg : Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-49351-5_170.

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Actes de conférences sur le sujet "K-edge subtraction"

Nurdan, K., T. Conka Nurdan, M. AlTaani, H. Yousef, A. H. Walenta, K. Walenta, A. Abboud et al. « Simultaneous acquisition of K-edge subtraction images using a pnCCD ». Dans 2008 IEEE Nuclear Science Symposium and Medical Imaging conference (2008 NSS/MIC). IEEE, 2008. http://dx.doi.org/10.1109/nssmic.2008.4774151.

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Pani, Silvia, Sarene C. Saifuddin, Christiana Christodoulou, Matthew Veale, Paul Seller, Robert D. Speller, Matthew Wilson et James W. Scuffham. « K-edge subtraction imaging using a pixellated energy-resolving detector ». Dans SPIE Medical Imaging, sous la direction de Norbert J. Pelc, Ehsan Samei et Robert M. Nishikawa. SPIE, 2011. http://dx.doi.org/10.1117/12.876577.

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Kulpe, Stephanie, Martin Dierolf, Eva-Maria Braig, Benedikt Günther, Klaus Achterhold, Bernhard Gleich, Julia Herzen, Ernst Rummeny, Franz Pfeiffer et Daniela Pfeiffer. « K-edge subtraction imaging for angiography at a compact synchrotron source ». Dans Advances in Laboratory-based X-Ray Sources, Optics, and Applications VII, sous la direction de Alex Murokh et Daniele Spiga. SPIE, 2019. http://dx.doi.org/10.1117/12.2526771.

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Pani, Silvia, Sarene C. Saifuddin, Filipa I. M. Ferreira, James W. Scuffham, Philipp Stratmann, Matthew D. Wilson, Matthew C. Veale et al. « Optimization of K-edge subtraction imaging using a pixellated spectroscopic detector ». Dans 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (2012 NSS/MIC). IEEE, 2012. http://dx.doi.org/10.1109/nssmic.2012.6551700.

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Samadi, Nazanin, Mercedes Martinson, Bassey Bassey, Ariel Gomez, George Belev et Dean Chapman. « An energy dispersive bent Laue monochromator for K-edge subtraction imaging ». Dans PROCEEDINGS OF THE 12TH INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION – SRI2015. Author(s), 2016. http://dx.doi.org/10.1063/1.4952876.

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Porra, Liisa, Skander Layachi, Anssi R. A. Sovijärvi, Pekka Suortti et Sam BAYAT. « High-resolution In-vivo Synchrotron Imaging Of Lung Structure And Regional Ventilation In Rat Using The K-edge Subtraction Technique ». Dans American Thoracic Society 2010 International Conference, May 14-19, 2010 • New Orleans. American Thoracic Society, 2010. http://dx.doi.org/10.1164/ajrccm-conference.2010.181.1_meetingabstracts.a6626.

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Bayat, Sam, Loïc Degrugilliers, Liisa Porra, Gergely Albu, Heikki Suhonen, Satu Strengell, Gergely Fodor et al. « Feasibility Of K-Edge Subtraction (KES) Synchrotron Imaging For The Measurement Of Regional Aerosol Deposition, Lung Ventilation And Airway Morphology In Rabbit ». Dans American Thoracic Society 2012 International Conference, May 18-23, 2012 • San Francisco, California. American Thoracic Society, 2012. http://dx.doi.org/10.1164/ajrccm-conference.2012.185.1_meetingabstracts.a5577.

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Stein, William E., Brian E. Newnam et Alex H. Lumpkin. « Generation of Backscattered X-Rays within an FEL Oscillator for Coronary Angiography* ». Dans Free-Electron Laser Applications in the Ultraviolet. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/fel.1988.fc7.

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X-rays produced within an infrared free-electron laser (FEL) and imaged with a gated, intensified television camera may provide an inexpensive alternative to the use of synchrotrons for transvenous coronary angiography. The energy of these x-rays is dependent on the electron energy that can be controlled electronically. Variation of the x-ray energy will allow radiography above and below the K-edge of a number of elements. Image enhancement can be accomplished by digital subtraction of the radiographs. The x-ray intensities based on photon and electron intracavity powers in the operating Los Alamos 10-μm FEL compare favorably with those obtained from larger and much more expensive synchrotrons and electron storage rings. The FEL x-ray source and gated television camera can be synchronized with different phases of breathing and cardiac motion to allow the study of the heart and blood vessels at various stages of these motions.

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Rapports d'organisations sur le sujet "K-edge subtraction"

Giacomini, John C. K-Edge Subtraction Angiography with Synchrotron X-Rays. Office of Scientific and Technical Information (OSTI), décembre 1996. http://dx.doi.org/10.2172/762052.

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Giacomini, John c. Final Report : K-Edge Subtraction Angiography with Synchrotron X-rays, February 1, 1987 - December 31, 1996. Office of Scientific and Technical Information (OSTI), décembre 1996. http://dx.doi.org/10.2172/765160.

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Hofstadter, R. K-edge subtraction angiography with synchrotron x-rays : Final technical report, (February 1, 1984 to January 31, 1987). Office of Scientific and Technical Information (OSTI), septembre 1987. http://dx.doi.org/10.2172/6075924.

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