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检索条件"任意字段=Conference on Advances in Computational Methods for X-Ray Optics V"

共 154 条记录，以下是1-10 订阅

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advances in computational methods for x-ray optics v

Advances in Computational Methods for X-Ray Optics V

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advances in computational methods for x-ray optics v 2020

ISBN: (纸本)9781510637924

The proceedings contain 24 papers. The topics discussed include: Mcxtrace anno 2020 - complex sample geometries and GPU acceleration;WISER wavefront propagation simulation code: advances and applications;reduced model representation of x-ray transport suitable for beamline control;perturbation perspective of partial coherence discussion on imperfect x-ray optical elements;reconstruction of offsets of an electron gun using deep learning and an optimization algorithm;CPU and memory efficient coherent mode decomposition for the partially coherent x-ray simulations;parallel performance of 'Synchrotron Radiation Workshop' code: partially coherent calculations for storage rings and time-dependent calculations for xFELs;and recent developments in x-ray lens modeling with SRW.

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L-BFGS Optimization in GANs for Enhanced Pulmonary Disease Prediction from x-ray Images 4

L-BFGS Optimization in GANs for Enhanced Pulmonary Disease P...

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4th International conference on advances in Electrical, Computing, Communication and Sustainable Technologies, ICAECT 2024

作者： Indumathi, v. Siva, R. School of Computing Department of Computational Intelligence Tamil Nadu Kattankulathur India

ISBN: (纸本)9798350343670

In the realm of medical imaging for pulmonary disease diagnosis, this research addresses the critical need for accurate and timely predictions from x-ray images. Pulmonary diseases pose significant health challenges, necessitating advanced methodologies for early detection and intervention. This study introduces a novel approach, "Optimizing Pulmonary Disease Prediction with GANs and L-BFGS Algorithm,"which leverages Generative Adversarial Networks (GANs) in conjunction with the L-BFGS optimization algorithm. The proposed model aims to surpass existing techniques by enhancing accuracy, reducing prediction time, and enabling early detection. Through comprehensive experimentation on the MIMIC-CxR chest x-ray dataset, the model outperforms traditional methods, demonstrating superior accuracy, sensitivity, specificity, and Matthews Correlation Coefficient (MCC). Beyond its success in pulmonary disease prediction, the proposed model showcases potential applications across diverse medical imaging modalities. The study not only contributes a cutting-edge approach to pulmonary disease diagnosis but also underscores the broader implications of integrating advanced deep learning techniques into medical imaging. The insights gained from this research pave the way for more effective interventions, improved patient outcomes, and continued advancements in the field of medical image analysis for pulmonary diseases. © 2024 IEEE.

关键词： Early Detection GANs L-BFGS Optimization Medical Imaging Pulmonary Diseases

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Multilayer coating design methods for a high-energy x-ray imaging optic with complex design requirements 27

Multilayer coating design methods for a high-energy x-ray im...

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conference on advances in x-ray/EUv optics and Components xvII

作者： Walton, Chris C. Kozioziemski, Bernard Fein, Jeffrey R. Romaine, Suzanne E. vogel, Julia K. Lawrence Livermore Natl Lab Livermore CA 94550 USA Sandia Natl Labs Albuquerque NM 87185 USA Harvard & Smithsonian Ctr Astrophys Cambridge MA 02138 USA Univ Zaragoza Dept Theoret Phys Zaragoza Spain

ISBN: (纸本)9781510654655;9781510654648

Imaging of x-rays with energies >15 kev is a necessity for several applications in high-energy density physics experiments. Multilayer-coated, Wolter-type glancing-incidence optics offer higher collection efficiency than pinhole cameras or Kirkpatrick-Baez style mirrors, and can achieve spatial resolution of 10-100um over 1-8 mm fields of view with throughput similar to 1-10%. Designing the multilayer coating is a complex optimization problem, involving multiple tradeoffs. A narrow energy bandwidth (similar to 1kev) is desirable to exclude background, but a broad angular acceptance is desirable for the optic to image a large field (similar to 1-8 mm). A Wolter optic's net reflectivity is two-bounce R-2 = R-1*R-2 for a wide range of pairs of incidence angles theta(1), theta(2). In addition, the multilayer coating can be modified in several ways, such as varying the period thickness through the stack, and along the length of the optic. Parallelized searches using ordinary gradient-descent and Markov-Chain Monte Carlo (MCMC) have been applied to design an optic to image Z-pinch plasmas on the Z Machine at Sandia National Laboratories. methods are tested to design an appropriate cost function for this search, and to reduce computational cost to search the parameter space efficiently.

关键词： x-ray optics multilayer coatings plasma diagnostics high energy density optimization

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Dental Biometrics Segmentation on Panoramic x-ray Images using computational Intelligence Approach 14

Dental Biometrics Segmentation on Panoramic X-Ray Images usi...

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14th International conference on advances in Computing, Control, and Telecommunication Technologies, ACT 2023

作者： Sujithra, M. Rathika, J. velvadivu, P. Abinanda, P. Gayathri, G. Rekha, v.S. Department of Computing – Data Science Coimbatore Institute of Technology Coimbatore India

Dental Biometric is a new field of study in the sector of biometrics identification. This technique can be sometimes used instead of the usual fingerprint biometric identification. In most of the cases, Dental Biometric credentials come handy to analyze the details of a dead person where, the Dental Biometrics of the person before death and the person after their death could potentially explain various reasons for their death and could justify their identity after death. Neural Networks have the potential to learn about anything using their complex construction structure. Here, x-ray copies of the dental teeth structure of a potential individual are given or fed to the network and the neural network with the help of an object detection platform such as OpenCv2 detects the teeth structure and can visualize the teeth structure with x-ray of that individual alone. As the neural is now able to see the teeth, it can learn a lot of crucial details about it from the picture it can understand. The interpretation about the teeth contours and the number of teeth is made along the way. The proposed methodology has better accuracy than the fuzzy clustering relevant methods. Also Suggested to use the appropriate values of parameters that should be opted for the algorithm. © Grenze Scientific Society, 2023.

关键词： Object detection

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Comprehensive Strategy for Analyzing Dementia Brain Images and Generating Textual Reports through viT, Faster R-CNN and GPT-2 Integration 1

Comprehensive Strategy for Analyzing Dementia Brain Images a...

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1st International conference on advances in Electrical, Electronics and computational Intelligence, ICAEECI 2023

作者： Sai Santhosh, v.C. Nikhil Eshwar, T. Ponraj, Riya Kiran, K. Easwari Engineering College Department of Computer Science and Engineering Tamil Nadu Chennai India Sri Krishna College of Technology Department of Electrical and Electronics Engineering Tamil Nadu Coimbatore India

ISBN: (纸本)9798350342796

Automated analysis of brain images linked to dementia benefits from the integration of vision Transformers (viT) and object detection methods, aimed at enhancing diagnostic quality through detailed x-ray descriptions derived from dementia-related brain imaging. Traditional diagnostic methodologies rely on manual inspection, susceptible to errors, while conventional computer vision lacks precision. viT models present a remedy by adeptly capturing intricate visual features. The proposed approach employs viT-based feature extraction and object detection to retrieve intricate components from brain images, facilitating comprehensive issue comprehension. This technique also pinpoints dementia-specific regions, enabling a thorough examination. The amalgamation of object recognition and viT-based feature extraction simplifies the generation of precise x-ray descriptions. The architecture encompasses data acquisition, preprocessing, viT-based feature extraction, object detection, GPT-2 text synthesis, and evaluation criteria. Leveraging appropriate loss functions and training techniques, the sophisticated model learns from diverse datasets to yield insightful outcomes. Performance assessment based on established benchmarks demonstrates clinical viability and heightened accuracy compared to prevailing methodologies. This investigation introduces a novel approach that melds advanced deep learning with critical medical diagnostics, addressing pressing healthcare demands. © 2023 IEEE.

关键词： Brain images Computer vision Data preprocessing Deep learning GPT-2 text synthesis Object detection vision transformers viT-based feature extraction x-ray reports

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Propagation of light in gradient index media with symmetrical iso-indicial (constant refractive index) contours

Propagation of light in gradient index media with symmetrica...

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conference on computational optics Held as Part of Part of SPIE Optical Systems Design conference

作者： Flynn, Conor Goncharov, Alexander, v Natl Univ Ireland Sch Phys Appl Opt Grp Univ Rd Galway Ireland

ISBN: (数字)9781510645950

ISBN: (纸本)9781510645950;9781510645943

Light propagation in non-homogeneous media with varying refractive index is challenging to analyse, even with knowledge of the gradient index (GRIN) structure n(x,y,z). Differential equations can be used to describe the path light rays take when travelling through a medium. Solutions to a differential equation are used to calculate the focal length of a GRIN lens with focus on quadratic GRIN profiles. ray-tracing in GRIN media is notoriously difficult, and usually not possible without numerical methods, however for several types of GRIN lenses, the analytical solution exists. Examples of spherical GRIN lenses can be found in nature such as the lens in an octopus eye. A formula is proposed here to calculate the focal length of such a lens which will be compared to previous studies and models created on ray-tracing software, ZEMAx.

关键词： GRIN lenses Gradient-index optics Refractive index ray tracing Geometrical optics ZEMAx Eye model Octopus Trout

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Perturbation perspective of partial coherence discussion on imperfect x-ray optical elements 5

Perturbation perspective of partial coherence discussion on ...

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conference on advances in computational methods for x-ray optics v

作者： Hu, Lingfei Sutter, John P. Wang, Hongchang Sawhney, Kawal Diamond Light Source Ltd Harwell Sci & Innovat Campus Didcot OX11 0DE Oxon England

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

The rapid development of new-generation synchrotron facilities with excellent coherence demands more accurate evaluation of beamline performance. A perturbation theory based on wave optics is proposed in this work to describe the effect of imperfections on the performance of x-ray optical elements. It shows that the perturbed performance of the non-ideal optical element could be derived from the perfect performance of the ideal optic through a convolution operation. The semi-analytical approach proposed here provides a new way to improve the simulation efficiency for imperfect optical elements. The finite aperture effect on diffraction-limited optics and focal shape distortion by surface height error are treated to show the application of the proposed method.

关键词： ray optics wave optics partial coherence wavefront propagation beamline design

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WISER wavefront propagation simulation code: advances and Applications 5

WISER wavefront propagation simulation code: Advances and Ap...

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conference on advances in computational methods for x-ray optics v

作者： Manfredda, M. Hafner, A. Gerusina, S. Mahne, N. Simoncig, A. Zangrando, M. Raimondi, L. Elettra Sincrotrone Trieste SCpA SS 14Km 163-5 I-34149 Basovizza TS Italy CERIC ERIC SS 14Km 163-5 I-34149 Basovizza TS Italy CNR IOM Ist Officina Mat SS 14Km 163-5 I-34149 Basovizza TS Italy

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

In this work, we report the advances in the development of WISER. WISER is a wave optics-based simulation library targeted at the simulation of the focusing performance of grazing x-ray optics systems, which accounts for the metrological data of figure error and roughness power spectral density. First presented in 2016 (phase-I), WISER inherits and expands the mathematical concepts of its ancestor, WISE, originally conceived for x-ray telescopes and then applied to free electron lasers. Thanks to its flexible framework, WISER easily allowed to simulate multi-element systems, as synchrotron and free electron laser beamlines. In phase-II (2020), WISER is further improved and it is delivered as fully integrable with OASYS, the graphical canvas gathering the mostly used x-ray computation tools. In the following, we will illustrate the architecture of the library and present some examples of its applications.

关键词： optics simulation x-ray oasys wiser metrology

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Diamond Machining of Two-in-one Optical Element Including Slice Mirror Array for Near-infrared Integral-field Spectrograph 5

Diamond Machining of Two-in-one Optical Element Including Sl...

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conference on advances in Optical and Mechanical Technologies for Telescopes and Instrumentation v

作者： Takeda, Masahiro Kushibiki, Kousuke Hosobata, Takuya Yamagata, Yutaka Morita, Shinya Saiki, Takao Nakagawa, Keiichi Ohtake, Yutaka Motohara, Kentaro Ozaki, Shinobu Tsuzuki, Toshihiro Takahashi, Hidenori Konishi, Masahiro RIKEN RIKEN Ctr Adv Photon RAP 2-1 Hirosawa Wako Saitama 3510198 Japan Univ Tokyo Grad Sch Sci Dept Astron Bunkyo Ku 7-3-1 Hongo Tokyo 1138654 Japan Tokyo Denki Univ Sch Engn Adachi Ku 5 Senju Asahi Cho Tokyo 1200026 Japan Univ Tokyo Grad Sch Engn Dept Precis Engn Bunkyo Ku 7-3-1 Hongo Tokyo 1138654 Japan Univ Tokyo Grad Sch Engn Dept Bioengn Bunkyo Ku 7-3-1 Hongo Tokyo 1138654 Japan Univ Tokyo Ctr Engn RACE Res Artifacts Bunkyo Ku 7-3-1 Hongo Tokyo 1138654 Japan Natl Astron Observ Japan Adv Technol Ctr 2-21-1 Osawa Mitaka Tokyo 1818588 Japan Univ Tokyo Inst Astron Kiso Observ 10762-30 Mitake Kiso Nagano 3970101 Japan Univ Tokyo Inst Astron 2-21-1 Osawa Mitaka Tokyo 1810015 Japan

ISBN: (纸本)9781510653580;9781510653573

A two-in-one optical element consisting of a planar pick-off mirror (16 x14 mm(2)) and a slice mirror array (twenty-six 0.52 mm-wide and 18 mm-long mirror facets) was developed as a component for a near-infrared integral field unit: SWIMS-IFU for a near-infrared imager and spectrograph SWIMS for TAO 6.5 m telescope. The two optical entities were formed on a single bulk of aluminum alloy using a 5-axis ultraprecision machine and a specialized pair of diamond cutting tools. The relative position and orientation of the two optical entities were controlled to satisfy the tight optical tolerance, by precise measurement of tool tip positions with respect to the axes of the machine tool. Regarding measurement, an x-ray CT scanner was introduced as a solution to a major problem in the evaluation of complex monolithic optics, where some facets cannot be measured due to geometric constraints. The diamond-machining and measurement methods proposed in this study will be useful also for more complex monolithic optics to be developed in the future.

关键词： Diamond Machining Integral Field Unit Image Slicers Monolithic Mirror Array Infrared optics

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Beam-shaping elements based on x-ray refractive optics: theory, modeling, and experiment 5

Beam-shaping elements based on X-ray refractive optics: theo...

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conference on advances in computational methods for x-ray optics v

作者： Zverev, D. Snigireva, I Snigirev, A. Immanuel Kant Baltic Fed Univ Nevskogo 14 Kaliningrad 236041 Russia European Synchrotron Radiat Facil 71 Ave Martyrs F-38043 Grenoble France

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

The optical system consisting of an x-ray parabolic axicon and traditional parabolic refractive lenses is considered. Such lenses combination makes it possible to flexibly adjust the size of the focused ring-shaped beam produced by axicon changing the number of the parabolic lenses in the optical system. The optical properties of the presented beam-shaping lens have been studied theoretically and experimentally tested. Based on the complex optical function of the lens a new approach to the phase-contrast imaging which takes advantage of the traditional x-ray microscopy and the unique optical properties of the parabolic refractive axicon was presented. Additionally, the computer simulation approach based on a Fast Fourier Transform wave optics computation was described as well as the corresponded numerical calculations of the considered optical transformations were performed. The simulation results are in good agreement with experimental ones.

关键词： x-ray beam-shaping refractive optics parabolic axicon lens phase-contrast microscopy coherent x-ray radiation synchrotron x-ray free electron laser (xFEL)

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