X-ray tomography or microtomography offers the oppurtunity to see inside objects. The object is digitized in its entire volume. It is possible to segment virtually regions of interest by their density differences.. Depending on the object size and the requested accuracy, we use medical CT scanners or microCT equipments.. With X-ray Tomography & microCT, it is possible to:. ...
X-ray tomography, a non-destructive technique, provides three-dimensional data with a spatial resolution down to the nanometer scale. Therefore, academia and industry as well as patients equally benefit from improvements in preparative work, data acquisition and analysis. Since 1997, the conference on Developments in X-ray Tomography has set the benchmark in dissemination of knowledge related to dedicated instrumentation, developments in software for reconstruction, artefact removal and data analysis as well as to the wide range of applications. The paper summarizes some aspects analyzing the previous volumes and the contributions in the current volume ...
Additional resources for Advances in X-ray Tomography for Geomaterials. Example text. 29, p. 1087-1107, 2005. , Moreaud M. , "Mesure tridimensionnelle de champs cinématiques par imagerie volumique pour lanalyse des matériaux et des structures", Instrumentation, Mesure, Métrologie, vol. 4, p. 43-88, 2004. , "Full 3D investigation of the local straint field in particulate metal matrix composites", Proc. 12th Int. Conf. on Experimental Mechanics ICEM12, Bari, Italy, p. 1-8, 29 August-2 Sept. 2004. , "Digital image correlation using Newton-Raphson method of partial differential correction", Experimental Mechanics, vol. The X-rays transmitted through the two polycarbonate cell walls, the confining fluid, and the claystone specimen, were converted into visible light by a phosphor screen scintillator. A 1024×1024 Dalstar CCD camera captured the raw digital images from the phosphor screen. The pixel size was 14×14 µm2, and a 1X objective was used for the scans described hereafter. 65 mm2 , which ...
The retention and release of flammable gases from corroded Magnox sludge waste at Sellafield, UK and secondary reprocessing waste at Hanford, USA has significant economic and safety implications for decommissioning various nuclear legacy buildings. Magnesium hydroxide is the primary precipitation product from the corrosion of first generation nuclear fuel in the UK, with hydrogen gas produced as a reaction by-product. Depending on the bed microstructure, wettability and shear yield stress behaviour, some consolidated sediments of these corrosion products are able to trap a substantial volume of gas, sufficient in some instances to become buoyant with respect to a water supernatant, resulting in an undesirable upward transfer of radioactive material from the consolidated bed. These phenomena are investigated using the decomposition of hydrogen peroxide to produce oxygen bubbles within magnesium hydroxide soft sediments at laboratory scale. X-ray tomography analysis showed that high strength ...
Four presentation will be given by researchers from Grenoble to make a focus on the different techniques using X-ray tomography as a powerful research tool in material sciences. ...
div class=citation vocab=http://schema.org/,,i class=fa fa-external-link-square fa-fw,,/i, Data from ,span resource=http://engineerradcc.library.link/resource/gDMHQ5O_UFc/ typeof=WorkExample http://bibfra.me/vocab/lite/Instance,,span property=name http://bibfra.me/vocab/lite/label,,a href=http://engineerradcc.library.link/resource/gDMHQ5O_UFc/,Developments in X-ray tomography III : 2-3 August, 2001, San Diego, [California], USA, Ulrich Bonse, chair/editor ; sponsored ... by SPIE--The International Society for Optical Engineering, (electronic resource),/a,,/span, - ,span property=offers typeOf=Offer,,span property=offeredBy typeof=Library ll:Library resource=http://engineerradcc.library.link/,,span property=name http://bibfra.me/vocab/lite/label,,a property=url href=http://engineerradcc.library.link/,Engineer Research and Development Center Library,/a,,/span,,/span,,/span,,/span,,/div ...
Advances in X-ray Tomography for Geomaterials von Jacques Desrues und Buchbewertungen gibt es auf ReadRate.com. Bücher können hier direkt online erworben werden.
Register your expression of interest to attend the Capital Roadmap for X-ray Tomography Town Meetings, which will be taking place on 08 November 2017 in London and 12 December in Manchester.
PubMed Central Canada (PMC Canada) provides free access to a stable and permanent online digital archive of full-text, peer-reviewed health and life sciences research publications. It builds on PubMed Central (PMC), the U.S. National Institutes of Health (NIH) free digital archive of biomedical and life sciences journal literature and is a member of the broader PMC International (PMCI) network of e-repositories.
p>Cell size is a key factor in initiating cell division in yeasts, and the number and volume of organelles have a profound impact on the function and viability of a cell. Soft X-ray tomography at the Advanced Light Source was used to characterize these parameters in strains of Saccharomyces cerevisiae at each of the key stages in the cell cycle and to determine relationships between cellular and organelle volumes. Results showed that growth of the major organelles-with the notable exception of vacuoles-is strictly regulated in accordance with cell size. Similar ratios were found to be maintained in Schizosaccharomyces pombe and Candida albicans. These experiments will undoubtedly improve our understanding of how cells control their size and that of their component organelles.. Reference: Uchida, M., et al. 2011. "Quantitative Analysis of Yeast Internal Architecture Using Soft X-Ray Tomography," Yeast 28, 227-36.. Topic Areas: ...
Sznitman, J; Sutter, R; Altorfer, D; Stampanoni, M; Rösgen, T; Schittny, J C (2010). Visualization of respiratory flows from 3D reconstructed alveolar airspaces using X-ray tomographic microscopy. Journal of Visualization, 13(4):337-345. ...
Computed tomography (CT) methods were applied to a problematic fossil spider (Arachnida: Araneae) from the historical Berendt collection of Eocene (ca. 44--4...
The variety of microstructures that form at low solidification speed in peritectic alloys, bands, and islands, or even coupled (or cooperative) growth of the primary α and peritectic β phases, have been previously explained by nucleation-growth mechanisms. In a recent investigation on Cu-Sn, a new growth mechanism was conjectured on the basis of two-dimensional (2-D) optical microscopy and electron backscattered diffraction (EBSD) observations made in longitudinal sections. In the present contribution, synchrotron-based tomographic microscopy has been used to confirm this mechanism: α and β phases totally interconnected in three dimensions and bands (or islands) can result from an overlay mechanism, rather than from a nucleation events sequence. When the lateral growth of a new layer is too fast, an instability can lead to the formation of a lamellar structure as for eutectic alloys. ...
We investigate a variant of the reconstruction technique for the in-line X-ray phase-contrast tomography data. This technique uses a newly introduced quantity, which represents a particular combination of the real and imaginary parts of the complex refractive index n. This quantity coincides with the real part of (1-n) in the case of objects having negligible absorption. The advantage of the proposed approach is in the significantly simplified form of the reconstruction algorithm for the introduced quantity. As demonstrated by our numerical experiments, the newly introduced quantity can be predictably associated with a particular refractive index.. ©2012 Optical Society of America. Full Article , PDF Article ...
List, a CEA Tech institute, is investigating ways to increase the use of X-ray tomography in non-destructive testing (NDT). The institutes Gerim 2 platform has a new robotic cell to help further this research.. X-ray tomography is a high-resolution imaging technique used for the non-destructive testing of sensitive parts. However, because the technique is difficult to implement, it had, until now, been used only to inspect small parts, due to the fact that the parts must be placed on a rotating platform between a fixed X-ray source and detector.. To use the technique on larger parts and, ultimately, right at the inspection site, List developed a new robotic inspection cell at its Gerim 2 platform. The cells major innovation is that the X-ray source and detector are no longer fixed. They are mounted on robotic arms, which move around the part being inspected, which remains fixed. "The main development here was advanced algorithms to reconstruct tomographic images generated by non-standard ...
Improved three-dimensional biomedical imaging can give a better understanding of tissue structure, growth and diseases. Most present imaging techniques that provide cellular spatial resolution are based on visible or infrared light. These methods cannot image deeper than a millimeter into tissue. Consequently, larger samples cannot be completely imaged without sectioning. Techniques that are typically used to image larger samples dont provide sufficient contrast and resolution to image cellular-sized features in soft tissues. There is a need for new imaging methods that can fill the gap between present methods. For practical reasons, compact equipment is preferred, to enable close connection to other research and applications. Furthermore, minimized sample preparation both reduces the work needed and the time until results are ready.. In this Thesis, propagation-based phase-contrast tomography with liquid-metal-jet x-ray sources has been investigated for high-resolution three-dimensional ...
CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract: Current computed tomography (CT) scanners, including micro-CT scanners, utilize a point x-ray source. As we target higher and higher spatial resolutions, the reduced x-ray focal spot size limits the temporal and contrast resolutions achievable. To overcome this limitation, in this paper we propose to use a line-shaped x-ray source so that many more photons can be generated, given a data acquisition interval. In reference to the simultaneous algebraic reconstruction technique (SART) algorithm for image reconstruction from projection data generated by an x-ray point source, here we develop a generalized SART algorithm for image reconstruction from projection data generated by an x-ray line source. Our numerical simulation results demonstrate the feasibility of our novel line-source-based x-ray CT approach and the proposed generalized SART algorithm.
Drought-related shrinking processes detected in living roots in the soil for the first time. Plant roots can shrink as a result of water deficit and lose contact with the surrounding soil. This effect has been suspected for a long time, but has only now been demonstrated for a fact with the help of x-ray tomography. The formation of an air gap could initially help plants prevent impending water losses when the soil dries out, say scientists from the Helmholtz Centre for Environmental Research (UFZ) writing in the Vadose Zone Journal. For their study, the researchers investigated roots of the white lupin (Lupinus albus L.) in sandy soil for a month, examining changes to the soil-root interface as the soil dried out and was irrigated, using x-ray tomography. Their research uncovered air gaps that formed as a result of root shrinkage during dry periods. "These interactions between soil structure and biological activity make the soil""root interface a complex and dynamic biomaterial whose importance ...
The X-Ray tool is working and Sven showed some signal integrity results at the Luxembourg meeting. Sven will share the latest progress and results at this webex meeting. ...
Dont know who to contact? Use our general e-mailadres: [email protected] Having trouble finding us? Get directions.. More information about using our facility can be found at the user page.. ...
The source size calculator, as published in [1], can be downloaded here. For the most recent version, please refer to the Github repository (external link). [1] G. Lovric, P. Oberta, I. Mohacsi, M. Stampanoni, and R. Mokso, Opt. Express 22, 2745 (2014), DOI: 10/q9m.
While X-ray crystallography is a powerful technique, artificial laboratory-grown crystals sometimes do not realistically reflect biology. The team sought to confirm their findings in living bacteria using an additional imaging technique called soft X-ray tomography, which bombards bacterial cells with X-rays to produce flat 2D images. The 2D images are then combined computationally to create a 3D picture of the whole, living bacteria. When packaging proteins lack the DNA-binding regions, the team found that the previously observed DNA networks are missing. In fact, the bacterial DNA seems to collapse into disarray, and the cell no longer grows properly. The team anticipates that these new findings may eventually lead to the development of next-generation antibiotic drugs that target this packaging system.. ...
A 4-cm piece of amber discovered among thousands of others in a quarry from southwestern France is helping to bridge a gap in our knowledge of the early development of feathers. The amber dates from the Early Cretaceous period, around 100 million years ago, and encases at least seven beautifully preserved feathers of a primitive type never seen before. They represent a critical stage in the evolution of feathers.. Conventional imaging techniques using transmitted light microscopes were used first (Figure 144) but this did not reveal sufficient information for a precise assessement of the morphology of the feathers. Phase contrast X-ray synchrotron imaging techniques have already demonstrated their power on fossil inclusions in amber [1], so we decided to apply such methods to image the unique fossil feathers. To reveal the finest structures of the feathers in three dimensions, a mosaic of 6 scans was performed using a single-distance phase retrieval approach (holotomography) with a voxel size of ...
An improved X-ray tomography system having an X-ray source, X-ray detector assembly and support means including a frame supporting a rotatable drum on which at least the source is mounted for rotation in a scanning plane about an axis of rotation. The rotatable drum is supported for centerless rotation on a cradle formed by resilient rollers, with the top half of the drum free to expand or contract as a result of temperature changes. The rollers are resilient so as to dampen vibration transfer between the frame and drum.
Synonyms for computed axial tomography at Thesaurus.com with free online thesaurus, antonyms, and definitions. Dictionary and Word of the Day.
Approach and Results-We combined an extensive in vivo imaging protocol (high-frequency ultrasound and contrast-enhanced microcomputed tomography at baseline and after 3, 10, 18, and 28 days of angiotensin II infusion) with synchrotron-based ultrahigh resolution ex vivo imaging (phase contrast X-ray tomographic microscopy) in n=47 angiotensin II-infused mice and 6 controls. Aortic regurgitation increased significantly over time, as did the luminal volume of the ascending aorta. In the samples that were scanned ex vivo, we observed one or several focal dissections, with the largest located in the outer convex aspect of the ascending aorta. The volume of the dissections moderately correlated to the volume of the aneurysm as measured in vivo (r2=0.46). After 3 days of angiotensin II infusion, we found an interlaminar hematoma in 7/12 animals, which could be linked to an intimal tear. There was also a significant increase in single laminar ruptures, which may have facilitated a progressive ...
The Potential Use of Transmission Tomography Techniques for the Quality Checking of Cement Encapsulated and Vitrified Wastes, J. Huddleston, I.G. Hutchinson, S.F. Burch, J.K. Perring books
Trends in micro- and nanoComputed Tomography (CT) from January 2008 through July 2010 are the subject of this brief report which takes up where a previous report in Developments in X-ray Tomography VI (2008) concluded. First, the number of systems operating world-wide is estimated. The main focus is on what searches of three citation indices (Web of Science, Compendex and PubMed) reveal about the field of micro- and nanoCT. Given research-fielddependent and disparate terminology used by investigators, searches were on "microtomography", "microCT" and "synchrotron tomography ...
Non-destructive analytical methods can be performed on meteorites, such as X-ray tomography and fluorescence, measurements of the density, volume, and magnetic susceptibility and gamma rays from radioactive decays. Because they are non-destructive such methods are nowadays often applied on precious extraterrestrial samples before anything destructive. However, many essential methods in meteoritics are destructive and require partial consumption of specimens. The cutting, grinding, and polishing of a specimen to prepare a polished section for classification, study of mineralogy, and surface analysis already consumes some material. To establish a chronology of the Solar System, dating of meteorites or their components by mass spectrometry is necessary. This requires dissolution chemistry, combustion, or melting. Thanks to improved instruments, analytical techniques, and protocols, detection sensitivities increase, and smaller samples can be used. Another notable example that requires destruction ...
In this work, a first-of-its-kind fully integrated tri-modality system that combines fluorescence, diffuse optical and x-ray tomography (FT/DOT/XCT) into the same setting is presented. The purpose of this system is to perform quantitative fluorescence tomography using multi-modality imaging approach. XCT anatomical information is used as structural priori while optical background heterogeneity information obtained by DOT measurements is used as functional priori. The performance of the hybrid system is evaluated using multi-modality phantoms. In particular, we show that a 2.4 mm diameter fluorescence inclusion located in a heterogeneous medium can be localized accurately with the functional a priori information, although the fluorophore concentration is recovered with 70% error. On the other hand, the fluorophore concentration can be accurately recovered within 8% error only when both DOT optical background functional and XCT structural a priori information are utilized to guide and constrain ...
An interview with Dr. Gerry McDermott of the National Center for X-ray Tomography. Dr. Biology tours the synchrotron that is also called the giant monster. Dr. Biology learns how the football sized facility is used to power a new kind of microscope.. Content Info , Transcript ...
An algorithm is created and applied to reconstruct the wavelet coefficients of an image from the Radon transform data for use in computed tomography, with a disclosed method that uses the properties of wavelets to localize the Radon transform such that a local region of the cross section of a body can be reconstructed using almost completely local data to significantly reduce the amount of exposure and computations in X-ray tomography. The described algorithm is based on the observation that for some wavelet bases with sufficiently many vanishing moments, the ramp-filtered version of the scaling function as well as the wavelet function has extremely rapid decay, with the variance of the elements of the nullspace is being negligible in the locally reconstructed image. ...
This is a general imaging course intended to: 1) cover the basic physical principles of image formation and contrast of the main imaging modalities; and 2) introduce their applications in disciplines such as medicine, biology, and chemistry. It is designed to be given for non-physics students and to explain elements of hardware, basic energy interaction leading to image formation, basic image properties including signal-to-noise ratio, resolution, and contrast, and finally sample and technical factors controlling image contrast. The main modalities include: x-ray imaging, computed x-ray tomography, magnetic resonance imaging (MRI) and spectroscopy (MRS), Nuclear Medicine (SPECT, PET Imaging). Functional and multi-dimensional imaging is also introduced. Students may be asked to cover elementary topics according to their background. ...
This area involves study and research in mechanics of composite materials, fracture mechanics, nano and micromechanics of materials, constitutive equations, mechanical behavior at high strain rates, structural analysis, and structural stability.. Experimental facilities include equipment for static structural testing; digital data acquisition equipment; uniaxial and biaxial materials-testing machines; custom loading devices; environmental chambers; microscopes; photomechanics facilities; composites processing equipment; facilities for microstructural analysis; and high-speed imaging and high strain rate mechanical testing facilities. Equipment for nano and microscale scale experiments include an atomic force microscope, an interfacial force microscope, a nano indentor, a confocal microscope and an X-ray tomography device. Computing facilities include workstations, high-performance computers, and networks of workstations.. ...
The ambition of such a GDRI is formulating a conceptual tool named as the "nanoscope" that combines most advanced statistical Physics numerical simulations (such as accelerated Molecular Dynamics) and experiments (such as X-Ray tomography and microscopy…). This "nanoscope" tools aims at elucidating the 3D texture of those multi-scale (and most of the time porous) materials from the scale of atoms to microns focusing in particular of mechanical and transport properties. The coupling between numerical simulation and experiments is a major theme of the GDRI and is one of the most challenging issues in Material Science, Mechanics and condensed matter Physics.. From a computational point of view, two ways are usually put forward: a utopian one that aims at developing "the ultimate simulation code" and a more pragmatic one that considers associating different scales by passing the "right" piece of information to the scale above and create an interface, for instance between atomistic description and ...
The oxidation of a carbon anode with air and CO2 occurs during the electrolysis of alumina in Hall-Héroult cells, resulting in a significant overconsumption of carbon and dusting. Boron is well known to decrease the rate of this reaction for graphite. In this work, the application of boron oxide has been investigated to evaluate its inhibition effect on the air oxidation reaction, and to provide an effective protection for anodes. Different methods of impregnation coating have been explored. Impregnated anode samples were gasified under air at 525 °C according to the standard measurement methods. X-ray tomography was used to obtain the microstructural information of the samples before and after air-burning tests. The impregnated samples showed a very low oxidation reaction rate and dust generation.
Our research activities are mainly concerned with the transition from the grain level to the REV level, from experimental and modeling vantage points, without excluding, however, the REV-to-structures transition issue. On the one hand, observations coming from the scanning electronic microscope, X-ray tomography and also destructive tests on individual grains, are designed to characterize the grain scale. These observations are then related to the stress - strain - strength relationship at the REV scale. In particular, a set of 3 triaxial cells (for samples of 70mm, 250mm and 1000mm, respectively) is employed to investigate the effect of grain breakage, whose amount is determined through grain size distributions (GSD) after loading, on the strength properties of dry frictional crushable soils (with maximum grain diameter of 12mm, 40mm and 160mm with regard to the respective sample size). On the other hand, from a numerical point of view, a homogenization procedure has been successfully developed ...
The researchers geospeedometer is based on millimeter-sized quartz crystals that grew within the magma bodies that produced these giant eruptions. Quartz crystals are typically found in magmas that have a high percentage of silica. This type of magma is very viscous and commonly produces extremely violent eruptions. Mount St. Helens was a recent example.. When the crystals form, they often capture small blobs of molten magma - known as blebs or melt inclusions. Blebs are initially round. While the crystal is floating in hot magma, diffusion causes them to gradually acquire the polygonal shape of the crystal void that they occupy. But this faceting process can be halted if eruption occurs before complete faceting is achieved.. Using advanced 3-D X-ray tomography, the researchers were able to measure the size and shape of the melt inclusions with exquisite precision. In cases where the inclusions had not become completely faceted, the researchers could determine how much time had elapsed since ...
Research Areas: Fibre networks, Porosity, Scaffolds, Osteoblast, Monocyte, Mesenchymal stem cells, Cell proliferation, Cell differentiation, Cell viability, Cytotoxicity, Inflammatory response, Cell-material interactions, Topography, Bioreactor, X-ray tomography. ...
The demonstration of cerebral oedema by computerised axial tomography (CAT) in patients with migraine was drawn to our attention by Drs J Ambrose and J Gawler of London. The subsequent unexpected finding of a significant degree of cerebral atrophy in a migraine sufferer further prompted our interest in the CAT changes in these patients. The findings in 46 patients with migrainous headaches were therefore reviewed.. ...
Minodronic acid (YM-529) is a third-generation bisphosphonate that directly and indirectly prevents proliferation, induces apoptosis, and inhibits metastasis of various types of cancer cells. Minodronic acid (YM-529) is an antagonist of purinergic P2X2/3 receptors involved in pain. - Mechanism of Action & Protocol.
Care guide for Cardiac Computerized Axial Tomography (Inpatient Care). Includes: possible causes, signs and symptoms, standard treatment options and means of care and support.
DESCRIPTION (provided by applicant): Soft x-ray microscopy shows enormous promise as a technique for imaging cellular structures at resolutions well beyond what can be achieved in optical microscopes, and with much simpler sample preparation than is required for electron microscopy. In addition, the lower radiation dose required (compared to electron microscopy) allows tomographic investigation of subcellular structures in three dimensions. Existing synchrotron based microscopes have shown the potential of the soft x-ray microscope as a research tool, but they have the disadvantage of being tied to a massive light source at only a few national laboratories. A suitably bright, compact, low cost light source is the enabling innovation needed to realize a commercial biological soft x-ray microscope. In a Phase I NIH SBIR program (2R44RR022488-02) Energetiq demonstrated a unique, compact light source that generates the required x-ray wavelength and intensity for imaging. In the following Phase II ...
Soft X-rays and Extreme Ultraviolet Radiation Principles and Applications (eBook) : Attwood, David T. : This self-contained, comprehensive book describes the fundamental properties of soft x-rays and extreme ultraviolet (EUV) radiation and discusses their applications in a wide variety of fields, including EUV lithography for semiconductor chip manufacture and soft x-ray biomicroscopy.--BOOK JACKET. The book will be of interest to graduate students and researchers in engineering, physics, chemistry, and the life sciences. It will also appeal to practicing engineers involved in semiconductor fabrication and materials science.--Jacket.
We have evaluated the penalized ordered-subset transmission reconstruction (OSTR) algorithm for postinjection single photon transmission scanning. The OSTR
The chain model for x-ray flash radiography (Ref. 1) developed at Los Alamos is an integrated simulation capability consisting of linked codes for the various physical processes that model an en$= radiographic event. Two new features have been added to the computational chaiwmodel: (1) a link between accelerator and particle-in-cell codes, enabling accelerated electrons to be injected into a 2-D, relativistic, fully electromagnetic particle-in-cell (PIC) code and propagated to a bremsstrahlung converter target, and (2) a distribution-function capability to create electron sources from PIC simulations for use in Monte Carlo electroxdphoton transport calculations to produce synthetic radiographs. Physical variables of electrons from PIC calculations are binned to produce distribution functions, which can be randomly sampled to obtain source particles for Monte Carlo transport calculations through a bremsstrahlung converter target. Several methods of binning have been used to construct both correlated and
Full-field Transmission X-ray Microscopy (TXM) has been shown to be a powerful method for obtaining quantitative internal structural and chemical information from materials at the nanoscale. The installation of a Full-field TXM station will extend the current microtomographic capabilities of the Diamond-Manchester I13 Imaging Branchline at Diamond Light Source (UK) into the sub-100 nm spatial resolution range using photon energies from 8 to 14 keV. The dedicated Full-field TXM station will be built in-house with contributions of Diamond Light Source support divisions and via collaboration with the X-ray Optics Group of Paul Scherrer Institut (Switzerland) which will develop state-of-the-art diffractive X-ray optical elements. Preliminary results of the I13 Full-field TXM station are shown. The Full-field TXM will become an important Diamond Light Source direct imaging asset for material science, energy science and biology at the nanoscale. ...
Define Computed Tomography, Pituitary. Computed Tomography, Pituitary synonyms, Computed Tomography, Pituitary pronunciation, Computed Tomography, Pituitary translation, English dictionary definition of Computed Tomography, Pituitary. n. Computerized axial tomography. Noun 1. computed axial tomography - a method of examining body organs by scanning them with X rays and using a computer to...
For nearly all elements, the real part, delta, of the complex index of refraction n (n = 1 - delta + i beta) is larger than the imaginary part, beta, in the x-ray region. Since only beta is used in absorption contrast, phase-contrast imaging techniques which give access to delta are very important. In this paper we present two different implementations of phase contrast in our compact soft x-ray microscope, differential-interference contrast and Zemike phase contrast.. ...
Learn about computed tomography (CT) scans and how this imaging procedure is used at Northwell Health to show detailed images of the body.