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The Pulsed Power Conference is held on a biannual basis and serves as the principal forum forthe exchange of information on pulsed power technology and engineering.
2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting
The joint meeting is intended to provide an international forum for the exchange of information on state of the art research in the area of antennas and propagation, electromagnetic engineering and radio science
The conference program will consist of plenary lectures, symposia, workshops and invitedsessions of the latest significant findings and developments in all the major fields of biomedical engineering.Submitted papers will be peer reviewed. Accepted high quality papers will be presented in oral and postersessions, will appear in the Conference Proceedings and will be indexed in PubMed/MEDLINE
The CDC is the premier conference dedicated to the advancement of the theory and practice of systems and control. The CDC annually brings together an international community of researchers and practitioners in the field of automatic control to discuss new research results, perspectives on future developments, and innovative applications relevant to decision making, automatic control, and related areas.
2020 IEEE 17th International Symposium on Biomedical Imaging (ISBI 2020)
The IEEE International Symposium on Biomedical Imaging (ISBI) is the premier forum for the presentation of technological advances in theoretical and applied biomedical imaging. ISBI 2020 will be the 17th meeting in this series. The previous meetings have played a leading role in facilitating interaction between researchers in medical and biological imaging. The 2020 meeting will continue this tradition of fostering cross-fertilization among different imaging communities and contributing to an integrative approach to biomedical imaging across all scales of observation.
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.
Electrical insulation common to the design and construction of components and equipment for use in electric and electronic circuits and distribution systems at all frequencies.
Publishes original and significant contributions relating to the theory, design, performance and reliability of electron devices, including optoelectronics devices, nanoscale devices, solid-state devices, integrated electronic devices, energy sources, power devices, displays, sensors, electro-mechanical devices, quantum devices and electron tubes.
Both general and technical articles on current technologies and methods used in biomedical and clinical engineering; societal implications of medical technologies; current news items; book reviews; patent descriptions; and correspondence. Special interest departments, students, law, clinical engineering, ethics, new products, society news, historical features and government.
IEEE Symposium Conference Record Nuclear Science 2004., 2004
Transmission X-ray radiography of dense objects plays an important role in AWE hydrodynamics (hydro) experiments. The most challenging of these hydro experiments is a flash radiographic technique known as 'core-punching'. This technique utilises a 100 ns burst of MeV photons to image a dense, explosively driven object. MeV X-ray flash radiographic imaging is typically characterised by a low signal fluence ...
IEEE Transactions on Nuclear Science, 2005
Neutron radiography, utilizing either film or a CCD camera, has been previously used to identify water ingress within the composite layers and the aluminum honeycomb core of flight control surfaces on the CF188 Hornet aircraft . Through transmission ultrasonics, X-radiography and infrared imaging have also been utilized to identify the presence of water in these components. At present, infrared imaging ...
2018 26th Telecommunications Forum (TELFOR), 2018
In this paper we analyse the possibility of simple detection of circular radiography markers. To detect the marker, we utilised the Hough transform. Two approaches were analysed: with detecting image edges and without image edge detection where pixel gradient was used in Hough voting process, i.e. to increase the accumulator values. Approaches were evaluated on 13 clinical radiography images. It ...
IEEE Transactions on Medical Imaging, 1999
The computed radiography (CR) technique, also known as the storage phosphor imaging technique, has evolved to be a major candidate for large-scale implementation of digital radiography during the past decade, In order to obtain a reasonable spatial resolution, the storage phosphor plate used is generally limited in thickness. This leads to X-rays being only partially absorbed by the detector. Useful ...
2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2006
Image registration is one of the image processing methods which is widely used in computer vision, pattern recognition, and medical imaging. In digital subtraction radiography, image registration is one of the important prerequisites to match the reference and subsequent images. In this paper, we propose an automatic non-rigid registration method namely curvature-based registration that relies on a curvature based penalizing ...
Transmission X-ray radiography of dense objects plays an important role in AWE hydrodynamics (hydro) experiments. The most challenging of these hydro experiments is a flash radiographic technique known as 'core-punching'. This technique utilises a 100 ns burst of MeV photons to image a dense, explosively driven object. MeV X-ray flash radiographic imaging is typically characterised by a low signal fluence of the most penetrating energies i.e. 2-5 MeV. X-ray converter (i.e. the scintillator) characteristics dominate the detector performance in terms of both quantum efficiency and resolution. Requirements are for a high (X-ray) quantum efficiency (>20%) together with /spl sim/1 mm spatial resolution. The design and construction of a large format pixelated BGO scintillator array, to meet this stringent requirement, is described.
Neutron radiography, utilizing either film or a CCD camera, has been previously used to identify water ingress within the composite layers and the aluminum honeycomb core of flight control surfaces on the CF188 Hornet aircraft . Through transmission ultrasonics, X-radiography and infrared imaging have also been utilized to identify the presence of water in these components. At present, infrared imaging of the flight control surfaces is routinely carried out as a field-level inspection, but a quantitative validation of the results had not previously been conducted. Although infrared imaging is a simple, nonintrusive and inexpensive method of inspection, neutron radiography is recognized as the most accurate method for indicating and quantifying the presence of water in the flight control surfaces. A quantitative comparison was recently carried out using CF188 rudders to validate the results of various nondestructive techniques relative to neutron radiography.
In this paper we analyse the possibility of simple detection of circular radiography markers. To detect the marker, we utilised the Hough transform. Two approaches were analysed: with detecting image edges and without image edge detection where pixel gradient was used in Hough voting process, i.e. to increase the accumulator values. Approaches were evaluated on 13 clinical radiography images. It was shown that approach that detects image edges spatially matches the reference circles only 0.22 % less than manual annotation values, whereas approach that uses just the gradient magnitudes spatially matches the reference circles 3.2 % less than manual annotations.
The computed radiography (CR) technique, also known as the storage phosphor imaging technique, has evolved to be a major candidate for large-scale implementation of digital radiography during the past decade, In order to obtain a reasonable spatial resolution, the storage phosphor plate used is generally limited in thickness. This leads to X-rays being only partially absorbed by the detector. Useful information may be contained in the X-rays transmitted through the detector. Multiple-plate imaging techniques may be used to capture and utilize the X-rays more efficiently. In this paper, an image fusion method, based on the Rayleigh principle and the Karhunen-Loeve (K-L) transform, is presented for optimizing the signal-to-noise ratio (SNR) of the fused image on a pixel-by-pixel basis. Because the multiple-plate images contain the same structural information, the signal components of the images are highly correlated with one another. Thus, the K-L transform is applied to decompose each of the multiple-plate images into an eigen image (the estimated signal) and a residual image (the estimated noise). An average representation entropy measure is maximized for selecting the number of eigen components to be included in the signal estimation. An experimental study, using an anthropomorphic chest phantom, is presented to illustrate pixelwise fusion of multiple-plate images. Experimental results show that the SNR of the fused image was improved by 12-48%, depending upon the anatomical regions of interest in the image.
Image registration is one of the image processing methods which is widely used in computer vision, pattern recognition, and medical imaging. In digital subtraction radiography, image registration is one of the important prerequisites to match the reference and subsequent images. In this paper, we propose an automatic non-rigid registration method namely curvature-based registration that relies on a curvature based penalizing term and its application on dental radiography. The regularizing term of this intensity- based registration approach provides affine linear transformation so that pre- registration step is no longer necessary. This leads to faster and more reliable solutions. The implementation of this approach is based on the numerical solution of the underlying Euler-Lagrange equations. In addition, a comparison between this algorithm and linear alignment method (LAM) with 20 image pairs is presented
The development and quality insurance of high tech products of industry needs the application of various nondestructive testing methods. We have applied neutron-, gamma-, and X-ray radiography, vibration diagnostics, acoustic emission, and neutron diffraction for testing various industrial products. Here, we present some of our recent results obtained on absorption-type refrigerators, on automotive Visco clutches and on high temperature thermostats.
The PHELIX pulsed power project will introduce magnetically driven hydrodynamics experiments to the Los Alamos National Laboratory's proton radiography facility (pRad). The Precision High Energy-density Liner Implosion eXperiment (PHELIX) has been commissioned at Los Alamos. A small footprint capacitor bank consisting of four parallel, air-insulated, single-stage, marx units (U ~ 300 kJ) is cable coupled to a toroidal, current step-up transformer to deliver multi-megampere current pulses (tpulse~10 μs) to cm size cylindrical loads. In a sequence of tests the performance of each component (capacitor bank and transformer) was evaluated and compared to a computer model. The transformer coupling was observed to be k ~ 0.93. A series of liner implosion experiments has been performed in which an aluminum liner (R ~3 cm, r = 0.8 mm, L = 3 cm) was accelerated to a velocity of ~ 1 km/s. The suite of machine diagnostics included linear Rogowski coils and Faraday rotation for current measurements. The experimental diagnostics include B-dot probes, multi-channel photon Doppler velocimetry (PDV), and single-frame, flash X-radiography to evaluate the performance of the high precision liner implosion. Currently, work is focused on integrating PHELIX into normal operations with the 800 MeV proton radiography facility at the Los Alamos Neutron Science Center (LANSCE), to enable high-resolution, high-frame-rate imaging of hydrodynamic experiments.
In 2011 a decision was made to build a neutron radiography/ facility at one of the unused horizontal channels of the LVR-15 research reactor in Rez, Czech Republic. One of the key conditions for operating an effective radiography facility is the delivery of a high intensity, homogeneous and collimated thermal neutron beam at the sample location. Additionally the intensity of fast neutrons has to be kept as low as possible as the fast neutrons may damage the detectors used for neutron imaging. As the spectrum in the empty horizontal channel roughly copies the spectrum in the reactor core, which has a high ratio of fast neutrons, neutron filter components have to be installed inside the channel in order to achieve desired beam parameters. As the channel design does not allow the instalment of complex filters and collimators, an optimal solution represent neutron filters made of large single-crystal ingots of proper material composition. Single-crystal silicon was chosen as a favorable filter material for its wide availability in sufficient dimensions. Besides its ability to reasonably lower the ratio of fast neutrons while still keeping high intensities of thermal neutrons, due to its large dimensions, it suits as a shielding against gamma radiation from the reactor core. For designing the necessary filter dimensions the Monte-Carlo MCNP transport code was used. As the code does not provide neutron cross-section libraries for thermal neutron transport through single-crystalline silicon, these had to be created by approximating the theory of thermal neutron scattering and modifying the original cross-section data which are provided with the code. Carrying out a series of calculations the filter thickness of 1 m proved good for gaining a beam with desired parameters and a low gamma background. After mounting the filter inside the channel several measurements of the neutron field were realized at the beam exit. The results have justified the calculated values. After the successful filter installing and a series of measurements, first test neutron radiography attempts with test samples could been carried out.
Proton radiography using a multilayer ionization chamber can potentially be used for assessing the quality of the stopping power computation in proton therapy. However, the finite proton beam profile leads to a degradation of the depth-dose curves (`blurring') measured by the range probe, which makes the estimation of the integrated proton stopping power a complex task. Existing methods aiming at determining a map of the integrated proton stopping power currently involve the use of the planning x-ray computed tomography (CT) as a priori knowledge. Consequently, such methods are very sensitive to small misalignment between the planning CT and the proton radiography acquisitions, to errors in the stopping power computation and to changes in the anatomy of the patient. In this paper, we develop an algorithm based on a sparsity assumption that estimates the integrated proton stopping power map of an anthropomorphic phantom from proton radiography data without using any prior information from the CT.
In order to measure the noise power spectrum (NPS) of a radiography detector from acquired images without any object, a subtraction-based algorithm, in which the input image is subtracted from another image acquired at the same exposure condition, is usually used to alleviate the fixed pattern noise influence. However, depending on variations in the x-ray tube and the readout circuits in the detector, the acquired images show nonuniform statistics and thus selecting an appropriate image pair from a given image set is important for a stable measurement of NPS. In order to select a good image pair for measuring an accurate normalized NPS (NNPS), a measurement method is proposed based on selecting an image pair from comparing the signal-to-noise ratios, which are obtained from the subtracted image. For the comparison, a commutative relationship as a sufficient condition for the accurate NNPS is considered. For a given image pair, the proposed method can provide a degree of accuracy of the empirical NNPS. For real x-ray images acquired from an indirect radiography detector, the proposed method is tested and shows stable measuring results for a set of images.
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Lawrence Livermore National Laboratory
Deputy Associate Program Leader for Nuclear Materials
Lawrence Livermore National Laboratory
X-Ray Imaging Postdoctoral Researcher
Lawrence Livermore National Laboratory
Pulsed Power Engineer - Laser and Experimental Systems
Lawrence Livermore National Laboratory
WCI Experimental Physicist
Lawrence Livermore National Laboratory