Distribution by Scientific Domains
Distribution within Medical Sciences

Kinds of Scanning

  • alanine scanning
  • body scanning
  • computed tomography scanning
  • ct scanning
  • densitometric scanning
  • duplex scanning
  • dxa scanning
  • emission tomography scanning
  • environmental scanning
  • fmri scanning
  • genome scanning
  • ion scanning
  • laser scanning
  • laser surface scanning
  • mri scanning
  • mutation scanning
  • optical scanning
  • pet scanning
  • positron emission tomography scanning
  • precursor ion scanning
  • product ion scanning
  • surface scanning
  • tomography scanning
  • ultrasound scanning

  • Terms modified by Scanning

  • scanning calorimeter
  • scanning calorimetry
  • scanning calorimetry analysis
  • scanning calorimetry experiment
  • scanning calorimetry measurement
  • scanning calorimetry result
  • scanning calorimetry studies
  • scanning confocal microscope
  • scanning confocal microscopy
  • scanning cytometry
  • scanning device
  • scanning electrochemical microscopy
  • scanning electron
  • scanning electron micrograph
  • scanning electron microscope
  • scanning electron microscope analysis
  • scanning electron microscope image
  • scanning electron microscope observation
  • scanning electron microscopes
  • scanning electron microscopic
  • scanning electron microscopic analysis
  • scanning electron microscopic examination
  • scanning electron microscopic observation
  • scanning electron microscopic study
  • scanning electron microscopy
  • scanning electron microscopy analysis
  • scanning electron microscopy image
  • scanning electron microscopy investigation
  • scanning electron microscopy measurement
  • scanning electron microscopy micrograph
  • scanning electron microscopy observation
  • scanning electron microscopy studies
  • scanning electron microscopy study
  • scanning electron microscopy techniques
  • scanning electronic microscope
  • scanning electronic microscopy
  • scanning force microscopy
  • scanning laser doppler flowmetry
  • scanning laser microscope
  • scanning laser microscopy
  • scanning methods
  • scanning microscope
  • scanning microscopy
  • scanning mode
  • scanning monochromator
  • scanning mutagenesi
  • scanning near-field optical microscope
  • scanning near-field optical microscopy
  • scanning probe microscopy
  • scanning protocol
  • scanning speed
  • scanning technique
  • scanning technology
  • scanning time
  • scanning transmission electron microscopy
  • scanning tunneling microscope
  • scanning tunneling microscopy
  • scanning tunneling spectroscopy
  • scanning tunnelling microscopy

  • Selected Abstracts

    A New Approach for Health Monitoring of Structures: Terrestrial Laser Scanning

    H. S. Park
    Three-dimensional (3D) coordinates of a target structure acquired using TLS can have maximum errors of about 10 mm, which is insufficient for the purpose of health monitoring of structures. A displacement measurement model is presented to improve the accuracy of the measurement. The model is tested experimentally on a simply supported steel beam. Measurements were made using three different techniques: (1) linear variable displacement transducers (LVDTs), (2) electric strain gages, and (3) a long gage fiber optic sensor. The maximum deflections estimated by the TLS model are less than 1 mm and within 1.6% of those measured directly by LVDT. Although GPS methods allow measurement of displacements only at the GPS receiver antenna location, the proposed TLS method allows measurement of the entire building's or bridge's deformed shape, and thus a realistic solution for monitoring structures at both structure and member level. Furthermore, it can be used to create a 3D finite element model of a structural member or the entire structure at any instance of time automatically. Through periodic measurements of deformations of a structure or a structural member and performing inverse structural analyses with the measured 3D displacements, the health of the structure can be monitored continuously. [source]

    Solvothermal production of CdS nanorods using polyvinylpyrrolidone as a template

    Titipun Thongtem
    Abstract CdS nanorods were solvothermally produced using Cd(NO3)2 and S powder in ethylenediamine containing different amounts of polyvinylpyrrolidone (PVP). The phase with hexagonal structure was detected using X-ray diffraction (XRD) and selected area electron diffraction (SAED). Their SAED patterns were in accordance with those of the simulations. Scanning and transmission electron microscopies (SEM and TEM) revealed the presence of CdS nanorods with their lengths influenced by different amounts of PVP. The nanorods were also characterized using high resolution TEM (HRTEM). They grew in the [001] direction normal to the (002) parallel crystallographic planes composing the nanorods. Raman spectra showed the 1LO (first harmonic) and 2LO (second harmonic) modes at the same wavenumbers although the products were produced under different conditions. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

    Texts, Tensions, Subtexts, and Implied Agendas: My Quest for Cultural Pluralism in a Decade of Writing

    CURRICULUM INQUIRY, Issue 2 2004
    Carola Conle
    ABSTRACT Scanning my own academic work to discover hidden agendas revealed underlying issues that seemed important in cultural pluralism. They included the need for recognition and for public spaces in culturally pluralistic environments where the experiences of individuals from very different background are listened to and valued. It was particularly interesting that such settings seemed to be highly conducive to inquiry. The differences among people's experiences intensified an implicit inquiry dynamic when narrative was the medium of choice rather than argumentative discussion. In those settings, as well as in the reexamination of my own writing, becoming clearer about what was only indirectly expressed earlier brought greater clarity about important issues. [source]

    The Impact of Duplex Scanning in Phlebology

    Nicos Labropoulos PhD
    Chronic venous disease (CVD) is a tremendous medical and economic burden on society. In the past two decades the use of duplex ultrasound has emerged as the diagnostic method of choice for the diagnosis and management of CVD. In this article, we describe the specific techniques used in the assessment of the superficial, perforating, and deep venous systems. We also discuss the methods of ulcer bed and chronic obstruction evaluation. The contributions of the duplex ultrasound to the understanding of the pathophysiology and improvement of treatments for chronic venous disease are reviewed. [source]

    Scanning the addiction horizons, 2003: report on a consultation

    ADDICTION, Issue 11 2003
    First page of article [source]

    Biomimetic Composites: Protein Localization in Silica Nanospheres Derived via Biomimetic Mineralization (Adv. Funct.

    Abstract Lysozyme-templated precipitation of silica synthesized by sol-gel chemistry produces a composite material with antimicrobial properties. This study investigates the structural properties of the composite material that allow for retention of the antimicrobial activity of lysozyme. Scanning (SEM) and transmission (TEM) electron microscopy reveal that the composite has a hierarchical structure composed of quasi-spherical structures (,450 nm diameter), which are in turn composed of closely packed spherical structures of ,8,10 nm in diameter. Using small-angle neutron scattering (SANS) with contrast variation, the scattering signatures of the lysozyme and silica within the composite were separated. It was determined that the lysozyme molecules are spatially correlated in the material and form clusters with colloidal silica particles. The size of the clusters determined by SANS agrees well with the structural architecture observed by TEM. BET analysis revealed that the surface area of the composite is relatively low (4.73 m2/g). However, after removal of the protein by heating to 200 °C, the surface area is increased by ,20%. In addition to demonstrating a well organized sol-gel synthesis which generates a functional material with antimicrobial applications, the analysis and modeling approaches described herein can be used for characterizing a wide range of mesoporous and ultrastructural materials. [source]

    Protein Localization in Silica Nanospheres Derived via Biomimetic Mineralization

    Mateus B. Cardoso
    Abstract Lysozyme-templated precipitation of silica synthesized by sol-gel chemistry produces a composite material with antimicrobial properties. This study investigates the structural properties of the composite material that allow for retention of the antimicrobial activity of lysozyme. Scanning (SEM) and transmission (TEM) electron microscopy reveal that the composite has a hierarchical structure composed of quasi-spherical structures (,450 nm diameter), which are in turn composed of closely packed spherical structures of ,8,10 nm in diameter. Using small-angle neutron scattering (SANS) with contrast variation, the scattering signatures of the lysozyme and silica within the composite were separated. It was determined that the lysozyme molecules are spatially correlated in the material and form clusters with colloidal silica particles. The size of the clusters determined by SANS agrees well with the structural architecture observed by TEM. BET analysis revealed that the surface area of the composite is relatively low (4.73 m2/g). However, after removal of the protein by heating to 200 °C, the surface area is increased by ,20%. In addition to demonstrating a well organized sol-gel synthesis which generates a functional material with antimicrobial applications, the analysis and modeling approaches described herein can be used for characterizing a wide range of mesoporous and ultrastructural materials. [source]

    Using Multimedia to Introduce Young People to Public Art in Glasgow

    Glen Coutts
    This paper is based on a presentation at the NSEAD/AAIAD Millennium Conference in Bristol, April 2000 and takes as its focus a recent multimedia publication, a CD-ROM, commissioned by Glasgow 1999, entitled ,Scanning the City'. The commission was to find effective ways that students in schools could interrogate the diverse urban fabric of Glasgow. The electronic revolution has shifted the paradigms of teaching and learning by creating the opportunity to engage interactively with visual and textual data in ways that permit investigation of the built environments at a number of levels of intensity. The paper explains the background to the CD-ROM, describes the design, content and theoretical underpinning of ,Scanning the City' and discusses ways it might be used in a variety of educational contexts. It concludes by looking forward to the next stages of the research including a study of how young people and teachers are using the CD-ROM and other related multimedia publications. [source]

    Embryo development of Corticium candelabrum (Demospongiae: Homosclerophorida)

    Sonia De Caralt
    Abstract. Corticium candelabrum is a homosclerophorid sponge widespread along the rocky Mediterranean sublittoral. Scanning and transmission electron microscopy were used to describe the gametes and larval development. The species is hermaphroditic. Oocytes and spermatocytes are clearly differentiated in April. Embryos develop from June to July when the larvae are released spontaneously. Spermatic cysts originate from choanocyte chambers and spermatogonia from choanocytes by choanocyte mitosis. Oocytes have a nucleolate nucleus and a cytoplasm filled with yolk granules and some lipids. Embryos are surrounded by firmly interlaced follicular cells from the parental tissue. A thin collagen layer lies below the follicular cells. The blastocoel is formed by migration of blastomeres to the morula periphery. Collagen is spread through the whole blastocoel in the embryo, but is organized in a dense layer (basal lamina) separating cells from the blastocoel in the larva. The larva is a typical cinctoblastula. The pseudostratified larval epithelium is formed by ciliated cells. The basal zone of the ciliated cells contains lipid inclusions and some yolk granules; the intermediate zone is occupied by the nucleus; and the apical zone contains abundant electron-lucent vesicles and gives rise to cilia with a single cross-striated rootlet. Numerous paracrystalline structures are contained in vacuoles within both apical and basal zones of the ciliated cells. Several slightly differentiated cell types are present in different parts of the larva. Most cells are ciliated, and show ultrastructural particularities depending on their location in the larvae (antero-lateral, intermediate, and posterior regions). A few smaller cells are non-ciliated. Several features of the C. candelabrum larva seem to support the previously proposed paraphyletic position of homoscleromorphs with respect to the other demosponges. [source]

    Synthesis and use of pHEMA microbeads with human EA.hy 926 endothelial cells

    Hervé Nyangoga
    Abstract Cancer has become a major problem in public health and the resulting bone metastases a worsening factor. Facing it, different strategies have been proposed and mechanisms involved in tumor angiogenesis are being studied. Enhanced permeability retention (EPR) effect is a key step in designing new anticancer drugs. We have prepared poly 2-hydroxyethyl methacrylate (pHEMA) microbeads to target human endothelial EA.hy 926 cells, a cell line derived from human umbilical vein endothelial cells. Microbeads were synthesized by emulsion precipitation method and carried positive or negative charges. EA.hy 926 cells were cultured in 24-well plates and microbeads were deposited on cells at various times. Scanning and transmission electron microscopy, flow cytometry, confocal microscopy, and three-dimensional (3D) reconstruction were used to characterize microbeads and their location outside and inside cells. Microbeads were uptaken by endothelial cells with a better internalization for negatively charged microbeads. 3D reconstruction of confocal optical sections clearly evidenced the uptake and internalization of microbeads by endothelial cells. pHEMA microbeads could represent potential drug carrier in tumor model of metastases. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2009 [source]

    Duplex Scanning in Vascular Disorders

    R Strahan
    No abstract is available for this article. [source]

    Technological Scanning by Small Canadian Manufacturers

    Louis Raymond
    Given that in many industries new production and information technologies have fundamentally changed the way in which firms must operate and compete, the technological aspect of environmental scanning has become a critical success factor for many small and medium-sized manufacturing enterprises. As little is presently known about how technological scanning manifests itself in these organizations and about what determines the nature and level of this activity, a survey study of 324 Canadian firms was done. Testing a research model resulted in identifying four interrelated dimensions of scanning activity, namely scanning objectives, type of information, information sources, and management practices. Key determinants of this activity were also identified, including the firms' strategy, environmental uncertainty, production technology, level of R&D, information networks, and the owner-manager's education level. [source]

    Use of Computed Tomography (CT) Scanning and Colorectal New Methylene Blue Infusion in Evaluation of an English Bulldog with a Rectourethral Fistula

    A.M. Cruse
    First page of article [source]

    Surface Laser Scanning of Fossil Insect Wings

    PALAEONTOLOGY, Issue 1 2004
    Olivier Béthoux
    Primary homologization of wing venation is of crucial importance in taxonomic studies of fossil and recent insects, with implications for large-scale phylogenies. Homologization is usually based on relative relief of veins (with an insect ground plan of alternating concave and convex vein sectors). However, this method has led to divergent interpretations, notably because vein relief can be attenuated in fossil material or because wings were originally flat. In order to interpret better vein relief in fossil insect wings, we tested the application of non-contact laser scanning. This method enables high resolution three-dimensional (3-D) data visualization of a surface, and produces high quality images of fossil insect wings. These images facilitate and improve interpretation of the homologization of wing venation. In addition, because the surface information is digitised in three axes (X, Y, Z), the data may be processed for a wide range of surface characteristics, and may be easily and widely distributed electronically. Finally, this method permits users to reconstruct accurately the fossils and opens the field of biomechanical interpretation using numerical modelling methods. [source]

    Optical super-resolution using higher harmonics and different acquisition modes in an aperture tapping SNOM

    Giovanni Longo
    Abstract Scanning near field optical microscopy (SNOM) is a well-established technique to obtain a sub-wavelength resolution optical characterization, together with nanometer-scale topography images, on any kind of biological or non-biological sample. Recently we have modified a classical SNOM unit to work in the tapping modality, ensuring stability, versatility and good optical resolution and signal to noise ratio. Exploiting the vertical tip movement, in particular, we were able to access two different optical detection modes: light modulation, which can be obtained by a mechanical chopper or by electronically switching the laser on and off; gap modulation in which the tip's vertical oscillation is used to produce, itself, a modulation of the collected light. Several biological and non-biological samples have been investigated and the data reveal that, despite the signal collected in gap-modulation is at least one order of magnitude smaller than in laser-modulation, resolution, and signal-to-noise ratio in the gap-modulated images is preferable. On the other hand, the higher intensity of the laser-modulation signal allows to deconvolve the optical information at higher harmonics of the tip oscillation frequency. This is a well-known procedure used in the apertureless-SNOM setup to enhance the near-field contribution of the scattered light and reduce the noise content. The interesting results obtained in this Aperture setup are described and commented. [source]

    Quantitative determination of phyllanthin and hypophyllanthin in Phyllanthus species by high-performance thin layer chromatography

    Arvind K. Tripathi
    Abstract A simple, precise and rapid high-performance thin-layer chromatographic method has been developed for the estimation of phyllanthin (1) and hypophyllanthin (2), the important lignans of Phyllanthus species, especially Phyllanthus amarus. Separation of 1 and 2 was carried out on silica gel 60 F254 layers eluted with hexane:acetone:ethyl acetate (74:12:8), and the analytes were visualised through colour development with vanillin in concentrated sulphuric acid and ethanol. Scanning and quantification of spots was performed at 580 nm. Recoveries of 1 and 2 were 98.7 and 97.3%, respectively. The method was validated and the peak purities and limits of detection and quantification were determined. Copyright © 2006 John Wiley & Sons, Ltd. [source]

    Quantitative determination of oleane derivatives in Terminalia arjuna by high performance thin layer chromatography

    D. V. Singh
    Abstract A simple, precise and rapid high performance thin layer chromatographic method has been developed for the simultaneous quantitative determination of five oleane derivatives, namely, arjunic acid, arjunolic acid, arjungenin, arjunetin and arjunglucoside I from stem bark extract of Terminalia arjuna. The isolation and separation of these compounds was carried out on 60F254 layers eluted with chloroform:methanol (90:10), and the analytes were visualised through colour development with vanillin in concentrated sulphuric acid:ethanol. Scanning and quantification of the spots at 640,nm showed good recoveries in the range 96.40,101.7%. Copyright © 2002 John Wiley & Sons, Ltd. [source]

    Scanning for chorionicity: comparison between sonographers and perinatologists

    PRENATAL DIAGNOSIS, Issue 9 2005
    Boaz Weisz
    Abstract Objective In most prenatal settings, twin pregnancies are initially evaluated by sonographers. Pregnancies diagnosed as monochorionic are subsequently referred to perinatologists or specialists in fetal medicine for the confirmation of chorionicity. In order to assess this screening strategy, we have compared the diagnosis of chorionicity made by the sonographers in the ultrasound department with the diagnosis done in the fetal medicine unit. Methods A cohort of women presenting with twin pregnancy and booked for prenatal care at University College London Hospitals over a 4-year period were investigated prospectively. All women were scanned at their initial visit at 11,14 weeks in the ultrasound department (US), and were subsequently referred to the Fetal Medicine Unit (FMU) for a second ultrasound evaluation. Ultrasound data were compared and diagnosis of chorionicity was confirmed by examination of the inter-twin membranes after delivery. Results Chorionicity was determined in 172 twin cases by the two different departments. The overall rate of concordant chorionicity determination between both units was 90.1%. The rate of discordant results in dichorionic pregnancies was extremely small, 1 in 119 pregnancies (0.8%). The rate of discordant results for monochorionic diamniotic pregnancies was 5.5%. Monoamniotic pregnancies were over-diagnosed by the US technicians. Discussion These results demonstrate that DC/DA chorionicity is accurately determined by sonographers at less than 14 weeks. In our opinion, it is both efficient and safe to rely on the diagnosis of the sonographers in DC/DA pregnancies in early pregnancy. In such pregnancies, a decision can be made either not to refer these patients for further evaluation of chorionicity by the fetal medicine team or to postpone the referral to after 14 weeks. Copyright © 2005 John Wiley & Sons, Ltd. [source]

    Electron Beam Computed Tomographic Scanning in Preventive Medicine

    David G. King BSc
    Undetected coronary atherosclerosis is present in the majority of patients suffering myocardial infarction or sudden death. Electron beam computed tomography affords noninvasive scanning of the heart to detect and measure coronary calcification. These data permit dramatically improved assessment of both short term and future risk for cardiac and other events. Knowledge of this risk gives the physician an opportunity for timely and cost-effective interventions. [source]

    Modulation of proteins in Naegleria fowleri amebae by bacteria

    Naegleria fowleri are free-living amebae found in soil and freshwater habitats that cause a fatal disease in humans called Primary Amoebic Meningoencephalitis. In the natural environment, amebae feed on bacteria. In the infected host, the amebae lyse and ingest nerve tissue. Proteins that lyse and degrade bacteria and mammalian cells have been described and are termed as naegleriapores or pore-forming proteins (PFP). In order to prevent autolysis from PFPs, Naegleria may have developed mechanisms that enable the amebae to survive in the presence of cytolytic molecules. Recently, we have established that N. fowleri express a "CD59-like" surface protein, but the function of this protein in amebae has not been elucidated. In mammalian cells, CD59 is a complement,regulatory protein that inhibits complement-mediated lysis of cells expressing this protein. In the present study, expression of the "CD59-like" protein in response to bacteria and bacterial toxins was investigated. Co-culture of N. fowleri with log phase Escherichia coli or Pseudomonas aeruginosa resulted in differential expression of the "CD59-like" protein. Treatment of the amebae with bacterial toxin also affected expression of the protein. Scanning and transmission electron microscopy demonstrated morphological changes in N. fowleri following co-incubation with the bacteria. Under all conditions examined, the amebae remained intact and viable. The results of our study implicate a possible protective role of the "CD59-like" protein in response to bacterial predators and bacterial toxins. [source]

    Health-Related Quality-of-Life Study in Patients With Carcinoma of the Thyroid After Thyroxine Withdrawal for Whole Body Scanning

    THE LARYNGOSCOPE, Issue 11 2006
    Sin-Ming Chow FRCR
    Abstract Objectives/Hypothesis: The authors studied the change of health-related quality of life (HR-QOL) in patients with differentiated thyroid carcinoma (DTC) with thyroxine (T4) withdrawal in preparation for whole body radioactive iodine scanning. Study Design: Seventy-eight patients with DTC and history of radioactive iodine (RAI) ablation were prospectively recruited. They completed the Functional Assessment of Cancer Treatment-General (FACT-G) questionnaire on weeks 0, 2, and 4 after T4 withdrawal with corresponding checking of serum thyroid-stimulating hormone (TSH). Results: Overall, 74.5% (58 of 78) of patients completed all FACT-G. Comparing FACT-G scores at weeks 0 and 4, "physical" (P < .001), "social" (P = .04), and "emotional" (P = .047) aspects were lowered as well as "total" HR-QOL (P = .001). However, the "functional" domain of HR-QOL was not affected (P = .14). Comparing FACT-G scores at week 0 and 2, we found that "physical" (P = .049) and "total" (P = .05) HR-QOL were affected early (in the first 2 weeks) in T4 withdrawal. Comparison of week 2 and 4 showed that in the later half of the withdrawal period, "physical" (P = .001), "emotional" (P = .02), and "total" FACT-G scores (P = .002) were affected. Mean TSH level (in mIU/L) increased gradually: 2.8 (week 0), 42.8 (week 2), 97 (week 3), and 153 (week 4). The percentage of patients attaining TSH level of >30 mIU/L were 55% (week 2), 96.2% (week 3), and 100% (week 4). Conclusions: HR-QOL declines with time of T4 withdrawal. The impact is more severe in the later period of T4 withdrawal. In 3 weeks, 96.2% of our patients attained TSH level of 30 mIU/L. To minimize the impact on HR-QOL, duration of T4 withdrawal can be decreased to 3 weeks. [source]

    Association of carotid artery atheromatous plaque types with cerebral perfusion

    ANZ JOURNAL OF SURGERY, Issue 11 2009
    Dong Yan Gao
    Abstract Background:, In an attempt to define the association of internal carotid artery atheromatous plaque morphology with potential cerebral ischaemia, we have investigated the relationship of different carotid plaque types with defects in cerebral perfusion. Methods:, In 130 patients requiring surgical correction of internal carotid artery stenoses greater than 70%, defects in cerebral perfusion due to both haemodynamic insufficiency and intracerebral vessel occlusion were identified using single photon emission computed tomography scans (SPECT). Carotid artery plaques in these patients were classified as homogeneous or heterogeneous based on preoperative Doppler Duplex Scanning and on the macroscopic characteristics of the plaques recorded by the surgeon during carotid endarterectomy, with sub-classification into potentially embolus-generating and non- embolus-generating plaques. In individual patients, plaque types were then correlated with the perfusion defects found in the SPECT scans. Results:, Of 130 patients, 112 (86%) had cerebral perfusion defects. In 56 asymptomatic patients in the study, 48 (85.7%) had perfusion defects as did 64 (86.5%) of 74 symptomatic patients. Cerebral infarcts were seen in 41 (31.5%). Occlusive infarcts (66%) were twice as frequent as haemodynamic insufficiency infarcts (34%). Eighteen patients with small cerebral infarcts on SPECT scanning gave no medical history of cerebral symptoms. Statistical analysis of the results revealed that there was no statistically identifiable association between carotid plaque type and the generation of cerebral symptoms or infarction. Conclusion:, This study found that internal carotid plaque morphology has no statistically significant association with perfusion defects, symptoms or cerebral infarction in patients with significant internal carotid artery stenosis. Also, it is suggested that haemodynamic cerebral infarction may be more common that previously believed (34% of infarcts identified in the study). Further, it is suggested that plaque morphology alone is not an indication for carotid endarterectomy. [source]

    Synthesis, and structural and morphological characterization of iron oxide,ion-exchange resin and ,cellulose nanocomposites,

    Lorenza Suber
    Abstract The synthesis and the comparative structural and morphological study of iron oxide nanoparticles in polystyrene-based ion-exchange resins and cellulosics are reported. The synthesis of magnetite was performed under nitrogen atmosphere by an in situ method in the presence of the matrix itself. Scanning and transmission electron microscopy measurements led to a detailed characterization of matrix morphology and of magnetic particle structure, size and morphology. The results show that the matrix influences the iron oxide particle size; the average size is about 7,nm in the resins and 25,nm in the celluloses. In the resins, particles are present inside the pores and as aggregates on the surface of the resin beads, whereas in the cellulose they are present on the surface and in the swollen network of the microfibers constituting the single fibers. Copyright © 2001 John Wiley & Sons, Ltd. [source]

    Hot Topics: Environmental Scanning

    Eileen Abels Associate Professor

    Scanning beyond the limits of standard OCT: OCT scans of the peripheral retina and the anterior chamber angle with a slitlamp integtrated FD-OCT system

    Purpose Exploring the quality of OCT images of the peripheral retina and anterior chamber angle made through a 3-mirror contactlens and a new FD-OCT device integrated into a slit lamp. Methods Patients with peripheral lesions (n=10) and glaucoma (n=10), seen in the outpatient clinic of the Academic Medical Center, were scanned with a Fourier Domain OCT integrated into a common Topcon slitlamp (SLD light source, central wavelength 830 nm, bandwidth 30 nm, 1024 pixel CCD camera, scan speed 5k A-scans per second, up to 1024 A-scans per b-scan). For posterior segment scans a fast Z-tracking system in the reference arm compensates for the dynamic character (movements of patient, handheld lens, slitlamp) of the examination. Scans of peripheral lesions, and the anterior chamber angle were made with a 3-mirror lens, while simultaneously the lesions were observed with the slitlamp. Results Scans of the peripheral retina obtained with a 3-mirror lens with the FD-OCT integrated into the slitlamp were of reasonably good quality and lesions, like peripheral laser scars, could be clearly identified. Compared to stand alone OCT systems, the integrated OCT system reached more peripheral lesions. The anterior chamber angle scanned through a 3-mirror lens enabled scans of the angle structures. Conclusion It is possible to scan the peripheral retina and anterior chamber angle through a 3-mirror contact lens with the slitlamp with integrated OCT. These scans could be of clinical interest in patients with pathology in the peripheral retina pathology or the anterior chamber angle. [source]

    Optical coherence tomography of chorioretinal and choroidal folds

    Giuseppe Giuffrè
    Abstract. Purpose:, To report the optical coherence tomography (OCT) findings in cases of chorioretinal and choroidal folds. Methods:, Eight subjects with folds of the fundus of the eye were examined with fundus photography, fluorescein angiography, B-scan ultrasonography and Stratus OCT. Results:, Two types patterns were found on OCT. Five cases showed undulating retinal as well as retinal pigment epithelial lines of normal thickness; these were defined as chorioretinal folds. The posterior vitreous surface often adhered to the crests of the folds only. Three cases exhibited a wavy appearance of the retinal pigment epithelium and a flat retinal surface; these were classified as choroidal folds. Conclusions:, Scanning by OCT can differentiate chorioretinal folds from choroidal folds and reveal the relationships between the folds and the posterior vitreous surface. [source]

    Scanning the genetic contributors of schizophrenia and bipolar disorder

    CLINICAL GENETICS, Issue 3 2004
    Article first published online: 20 AUG 200
    First page of article [source]

    A comparative study of 3D scanning in engineering, product and transport design and fashion design education

    A. Kus
    Abstract The aim of this paper is to evaluate the use of three-dimensional (3D) scanning technologies for design and engineering courses. This paper will provide a comparative discussion of the current 3D scanning technologies; and then describes three experimental studies in engineering, transport design and fashion design. Using 3D scanner technology the experiments tested the transferral of a variety of different data from scanned organic 3D shapes to 3D CAD packages for learning and teaching in undergraduate education. © 2009 Wiley Periodicals, Inc. Comput Appl Eng Educ 17: 263,271, 2009; Published online in Wiley InterScience (; DOI 10.1002/cae.20213 [source]

    Mobile Construction Supply Chain Management Using PDA and Bar Codes

    H. Ping Tserng
    However, extending the construction project control system to job sites is not considered efficient because using notebooks in a harsh environment like a construction site is not particularly a conventional practice. Meanwhile, paper-based documents of the site processes are ineffective and cannot get the quick response from the office and project control center. Integrating promising information technologies such as personal digital assistants (PDA), bar code scanning, and data entry mechanisms, can be extremely useful in improving the effectiveness and convenience of information flow in construction supply chain control systems. Bar code scanning is appropriate for several construction applications, providing cost savings through increased speed and accuracy of data entry. This article demonstrates the effectiveness of a bar-code-enabled PDA application, called the mobile construction supply chain management (M-ConSCM) System, that responds efficiently and enhances the information flow between offices and sites in a construction supply chain environment. The advantage of the M-ConSCM system lies not only in improving the efficiency of work for on-site engineers, but also providing the Kanban-like visual control system for project participants to control the whole project. Moreover, this article presents a generic system architecture and its implementation. [source]

    Perfusion MR imaging with pulsed arterial spin-labeling: Basic principles and applications in functional brain imaging

    Yihong Yang
    Abstract Basic principles of the arterial spin-labeling perfusion MRI are described, with focus on a brain perfusion model with pulsed labeling. A multislice perfusion imaging sequence with adiabatic inversion and spiral scanning is illustrated as an example. The mechanism of the perfusion measurement, the quantification of cerebral blood flow, and the suppression of potential artifacts are discussed. Applications of the perfusion imaging in brain activation studies, including simultaneous detection of blood flow and blood oxygenation, are demonstrated. Important issues associated with the applications such as sensitivity, quantification, and temporal resolution are discussed. © 2002 Wiley Periodicals, Inc. Concepts Magn Reson 14: 347,357, 2002 [source]