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Potential of computed tomography for inspection of aircraft components

Stephen G. Azevedo, Harry E. Martz, Daniel J. Schneberk, Michael T. Valley, Nancy K. Del Grande, Albert S. Kobayashi
1993 Nondestructive Inspection of Aging Aircraft  
Ib UNLIMITED m DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government.  ...  ABSTRACT Computed Tomography (CT) using penetrating radiation (x-or gamma-rays) can be used in a number of aircraft applications.  ...  The photon spectrum depends on the source energy distribution and detector efficiency. The quantity that is reconstructed in x-or y-ray CT is the attenuation value,.  ... 
doi:10.1117/12.163854 fatcat:tefyryqj7rhjhibq7ubf5e2iu4

Conebeam Microtomography Using a Fiberoptic Scintillator and a Lens-Coupled CCD Camera [chapter]

T. A. White, T. J. Roney, S. G. Galbraith
1997 Review of Progress in Quantitative Nondestructive Evaluation  
Departrnent of Energy, Assistant Secretary for Environmental Management, under DOE Idaho Operations Office Contract DE-AC07-94ID13223.  ...  We use a microfocus x-ray source and an adjustable radiographic magnification.  ...  X rays were generated with a FeinFocus (model FXE 100.50) rnicro-focus x-ray tube. The source was operated at 30kVp and 450J.tA.  ... 
doi:10.1007/978-1-4615-5947-4_282 fatcat:lo4t5najhbg3bd6buiynynfgje

Automatic Radiographic Position Recognition from Image Frequency and Intensity

Ning-ning Ren, An-ran Ma, Li-bo Han, Yong Sun, Yan Shao, Jian-feng Qiu
2017 Journal of Healthcare Engineering  
With the development of digital X-ray imaging and processing methods, the categorization and analysis of massive digital radiographic images need to be automatically finished.  ...  The proposed method is able to outperform the digital X-ray image's position recognition with a limited time cost and a simple algorithm.  ...  Acknowledgments The authors thank the funding support by the China National Key Research and Development Program (2016YFC0103400) and the Natural Science Foundation of Taishan Medical University (no.  ... 
doi:10.1155/2017/2727686 pmid:29104743 pmcid:PMC5623794 fatcat:zzwf3hnhefa5jccgf2w3uwxsfq

XraySyn: Realistic View Synthesis From a Single Radiograph Through CT Priors [article]

Cheng Peng, Haofu Liao, Gina Wong, Jiebo Luo, Shaohua Kevin Zhou, Rama Chellappa
2022 arXiv   pre-print
A radiograph visualizes the internal anatomy of a patient through the use of X-ray, which projects 3D information onto a 2D plane.  ...  Our method, XraySyn, can synthesize novel views on real radiographs through a combination of realistic simulation and finetuning on real radiographs.  ...  While inverse graphics is a daunting task to be solved directly on real radiographs, some attempts have been made to address it through Digitally Reconstructed Radiographs (DRRs) (Ying et al. 2019; Henzler  ... 
arXiv:2012.02407v2 fatcat:a7jacwvbhbb3lf3qx5yxx3e7ta

Space-Filling X-Ray Source Trajectories for Efficient Scanning in Large-Angle Cone-Beam Computed Tomography

Andrew M. Kingston, Glenn R. Myers, Shane J. Latham, Benoit Recur, Heyang Li, Adrian P. Sheppard
2018 IEEE Transactions on Computational Imaging  
It also possesses an effective preconditioner for fast iterative tomographic reconstruction.  ...  We show that the SFT provides greater data acquisition efficiency, and reduced reconstruction artifacts when compared with helical trajectory.  ...  The authors would also like to thank the use of supercomputer time provided by Australias National Computational Infrastructure.  ... 
doi:10.1109/tci.2018.2841202 fatcat:7djwewskrnfl3gmtxgz7ktmhju

X-ray computed tomography for nondestructive evaluation of advanced structural ceramics

1990 NDT International  
of a contract with the Department of Energy.  ...  '597-5 ANL-87-52 _ Argonne National Laboratory, with facilities in the states of Illinois and Idaho, is owned by the United States government, and operated by The University of Chicago under the provisions  ...  Carolyn Offutt of the Mallinckrodt Institute of Radiology helped acquire the CT data. Dr.  ... 
doi:10.1016/0308-9126(90)92177-3 fatcat:6gts4sztgrcnfd6cecmglyppuq

Real-Time Patient-Specific Lung Radiotherapy Targeting using Deep Learning [article]

Markus D. Foote, Sarang Joshi Scientific Computing and Imaging Institute, Department of Bioengineering, University of Utah, Department of Radiation Oncology, The University of Maryland School of Medicine)
2018 arXiv   pre-print
We approximate the nonlinear inverse of a diffeomorphic transformation composed with radiographic projection as a deep network that produces subspace coordinates to define the patient-specific deformation  ...  Pretreatment acquisition of a 4DCT allows for the development of accurate motion estimation for treatment planning.  ...  Acknowledgments We gratefully acknowledge the support of NVIDIA Corporation by providing the GPU used for this research.  ... 
arXiv:1807.08388v1 fatcat:ucrshwyivfc33h5xblqjiedoka

Computed tomography combined with a material decomposition technique using a compact deuterium-deuterium (D-D) fast neutron generator

B. Soubelet, R. Adams, H.-M. Prasser
2020 Radiation Physics and Chemistry  
By measuring the local neutron beam attenuation of an object as a function of energy, this can be related to its elemental composition.  ...  Therefore material decomposition measurements using a deuterium-deuterium (D-D) compact fast neutron generator in an energy-selective fashion have been carried out.  ...  The reconstructed CT image data were then scaled to give attenuation values in units of cm − 1 .  ... 
doi:10.1016/j.radphyschem.2020.109296 fatcat:q6woeqvmcbfnllqdmiihzvyyrm

Recent Advances in X-ray Cone-beam Computed Laminography

Neil S. O'Brien, Richard P. Boardman, Ian Sinclair, Thomas Blumensath
2016 Journal of X-Ray Science and Technology  
Developments throughout this field have thus been rapid, including the introduction of novel system trajectories, the application and refinement of various reconstruction methods, and the use of recently  ...  These include so called X-ray computed laminography systems capable of imaging specimens with large lateral dimensions, or large aspect ratios, neither of which are well suited to conventional CT scanning  ...  The differences are used to inform improvements to the trial solution by adjusting the attenuation values of pixels along the given ray path, until some stopping criteria is met.  ... 
doi:10.3233/xst-160581 pmid:27341626 fatcat:slpzg4ufzrd6romm2iy556fcfq

Image Processing on IOPA Radiographs: A comprehensive case study on Apical Periodontitis [article]

Diganta Misra, Vanshika Arora
2019 arXiv   pre-print
This paper provides a comprehensive in-depth case study of Image Processing, Feature Extraction and Analysis of Apical Periodontitis diagnostic cases in IOPA (Intra Oral Peri-Apical) Radiographs, a common  ...  With the recent advancements in Image Processing Techniques and development of new robust computer vision algorithms, new areas of research within Medical Diagnosis and Biomedical Engineering are picking  ...  Diganta Any image which is generated on a sensor plate or film by any rays of particular wavelength, usually X or gamma rays or comparable radiation is known as a radiograph [2] .  ... 
arXiv:1812.09693v2 fatcat:ry6ascl6y5bwdop54xpjg5zcp4

Front Matter: Volume 9786

2016 Medical Imaging 2016: Image-Guided Procedures, Robotic Interventions, and Modeling  
Publication of record for individual papers is online in the SPIE Digital Library. Paper Numbering: Proceedings of SPIE follow an e-First publication model.  ...  SPIE uses a six-digit CID article numbering system structured as follows:  The first four digits correspond to the SPIE volume number.  The last two digits indicate publication order within the volume  ...  Lastly, Robert Webster of Vanderbilt University spoke Proc. of SPIE Vol. 9786 978601-3 Fast generation of digitally reconstructed radiograph through an efficient preprocessing of ray attenuation values  ... 
doi:10.1117/12.2240097 dblp:conf/miigp/X16 fatcat:e2sr443rvfa7rcz24tfpgb44gy

A combined local and global motion estimation and compensation method for cardiac CT

Qiulin Tang, Beshan Chiang, Akinola Akinyemi, Alexander Zamyatin, Bibo Shi, Satoru Nakanishi, Bruce R. Whiting, Christoph Hoeschen
2014 Medical Imaging 2014: Physics of Medical Imaging  
(United States) Digital breast tomosynthesis (DBT) generates 3-D reconstructions of the breast by taking X-Ray projections at various angles around patient.  ...  detection in digital radiographs Hongda In X-ray examinations, it is essential that radiographers carefully use collimation to the appropriate anatomy of interest to minimize the overall integral dose  ...  FTIR chemical imaging allows the spatial distribution of chemistry to be rapidly imaged at a high (diffraction limited) spatial resolution where a pixel represents an area of 5.5 ? 5.5 µm2 of tissue.  ... 
doi:10.1117/12.2043492 fatcat:fyzpc5m6jbh7fjohqpdmtzkhte

Automated X-ray image analysis for cargo security: Critical review and future promise

Thomas W. Rogers, Nicolas Jaccard, Edward J. Morton, Lewis D. Griffin
2017 Journal of X-Ray Science and Technology  
We split the field into the classical pipeline of image preprocessing and image understanding.  ...  We review the relatively immature field of automated image analysis for X-ray cargo imagery.  ...  Acknowledgement Funding for this work was provided through the EPSRC Grant no. EP/G037264/1 as part of UCL's Security Science Doctoral Training Centre, and Rapiscan Systems Ltd.  ... 
doi:10.3233/xst-160606 pmid:27802247 fatcat:2kf6tmlnz5bbpdpptpg6fl3mfi

Principles of computer assisted tomography (CAT) in radiographic and radioisotopic imaging

R A Brooks, G Di Chiro
1976 Physics in Medicine and Biology  
in the Fourier domain because of the efficiency of the Fast Fourier Transform.  ...  -ray attenuation coefficient Back-Projection Description The first attempts at reconstructive tomography used a crude method of reconstruction now generally known as Back-Projection.  ... 
doi:10.1088/0031-9155/21/5/001 pmid:788005 fatcat:uehudn6v7jcdpcunk47ewlhvby

High Performance GPU-Based Fourier Volume Rendering

Marwan Abdellah, Ayman Eldeib, Amr Sharawi
2015 International Journal of Biomedical Imaging  
that look likeX-ray radiographs.  ...  Relying on theFourier projection-slice theorem, this technique operates on the spectral representation of a 3D volume instead of processing its spatial representation to generate attenuation-only projections  ...  Acknowledgment The authors would like to gratefully thank the anonymous reviewers for their kind feedback and constructive comments that have helped them in improving the quality of the paper.  ... 
doi:10.1155/2015/590727 pmid:25866499 pmcid:PMC4381991 fatcat:notwxhllkvg63bltor72mprbfa
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