A5058196770- Advanced X-ray Imaging Techniques
- Advanced X-ray and CT Imaging
- X-ray Spectroscopy and Fluorescence Analysis
- Medical Imaging Techniques and Applications
- Advanced Electron Microscopy Techniques and Applications
- Electron and X-Ray Spectroscopy Techniques
- Hydrocarbon exploration and reservoir analysis
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Mineral Processing and Grinding
- X-ray Diffraction in Crystallography
- Enhanced Oil Recovery Techniques
- Drilling and Well Engineering
- Advanced MRI Techniques and Applications
- Digital Holography and Microscopy
- Crystal Structures and Properties
- Particle Accelerators and Free-Electron Lasers
- Digital Radiography and Breast Imaging
- Food composition and properties
- Trace Elements in Health
- Coal Properties and Utilization
- Metal-Organic Frameworks: Synthesis and Applications
- Service-Learning and Community Engagement
- Crystallography and molecular interactions
- Solid-state spectroscopy and crystallography
Northwestern Polytechnical University
2024
CSIRO Manufacturing
2013-2023
Health Sciences and Nutrition
2002-2022
Commonwealth Scientific and Industrial Research Organisation
2013-2022
Materials Science & Engineering
2007-2016
Curtin University
2011-2012
SUNY Westchester Community College
2011
Australian Coal Research (Australia)
2006
Monash Health
2004
RWTH Aachen University
2002
We demonstrate simultaneous phase and amplitude extraction from a single defocused image of homogeneous object. Subject to the assumptions explicitly stated in derivation, algorithm solves twin-image problem in-line holography is capable analysing data obtained using X-ray microscopy, electron neutron microscopy or visible-light especially as they relate defocus point projection methods. Our simple, robust, non-iterative computationally efficient method applied an contrast ultramicroscope.
With controlled nanometre-sized pores and surface areas of thousands square metres per gram, metal-organic frameworks (MOFs) may have an integral role in future catalysis, filtration sensing applications. In general, for MOF-based device fabrication, well-organized or patterned MOF growth is required, thus conventional synthetic routes are not suitable. Moreover, to expand their applicability, the introduction additional functionality into MOFs desirable. Here, we explore use nanostructured...
In-line phase contrast enables weakly absorbing specimens to be imaged successfully with x-rays, and greatly enhances the visibility of fine scale structure in more strongly specimens. This type requires a spatially coherent beam, condition that can met by microfocus x-ray source. We have developed an microscope, based on such source, which is capable high resolution phase-contrast imaging tomography. Phase retrieval quantitative information recovered from microscope images homogeneous...
This review provides a brief overview, albeit from somewhat personal perspective, of the evolution and key features various hard X-ray phase-contrast imaging (PCI) methods current interest in connection with translation to wide range applications. Although such have already found wide-ranging applications using synchrotron sources, application dynamic studies laboratory/clinical context, for example vivo imaging, has been slow due limitations brilliance compact laboratory sources...
Absorption-contrast x-ray imaging serves to visualize the variation in attenuation within volume of a given sample, whereas phase contrast allows one variations refractive index. The former mechanism has been well known and widely utilized since time Röntgen’s Nobel prize winning work, latter mechanism—sought for, but not found, by Röntgen himself—has laid foundation for revolution which is central topic this review. We consider physical mechanisms underlying both absorption contrast,...
The usefulness of zinc oxide (ZnO) nanoparticles has led to their wide distribution in consumer products, despite only a limited understanding how this nanomaterial behaves within biological systems. From nanotoxicological viewpoint the interaction(s) ZnO with cells immune system is specific interest, as these nanostructures are readily phagocytosed. In study, rapid scanning X-ray fluorescence microscopy was used assay number associated ∼1000 individual THP-1 monocyte-derived human...
Summary We outline a new approach to X‐ray projection microscopy in scanning electron microscope (SEM), which exploits phase contrast boost the quality and information content of images. These developments have been made possible by combination high‐brightness field‐emission gun (FEG)‐based SEM, direct detection CCD technology retrieval algorithms. Using this we able obtain spatial resolution < 0.2 µm demonstrated novel features such as: (i) phase‐contrast enhanced visibility high...
We present a new method for quantitative nondestructive characterization of objects by x-ray phase-contrast imaging. Spatial distributions the projected values complex refractive index in sample are reconstructed processing near-field images collected at fixed sample-to-detector distance using polychromatic incident beam and an energy-sensitive area detector, such as CCD used photon-counting spectroscopy mode. The has potential advantages decreased radiation dose increased accuracy compared...
The first Born and Rytov approximations of scattering theory are introduced in their less familiar near-field versions. Two algorithms for phase retrieval based on these then described. It is shown theoretically by numerical simulations that, despite the differences formulation, two deliver fairly similar results when used optical near intermediate fields. applied to derive explicit solutions four phase-retrieval problems practical relevance quantitative phase-contrast imaging tomography. An...
The aim of this study was to optimise the experimental protocol and data analysis for in-vivo breast cancer x-ray imaging. Results are presented experiment at SYRMEP beamline Elettra Synchrotron using propagation-based phase-contrast mammographic tomography method, which incorporates not only absorption, but also phase information. In images tissue samples, a size corresponding full human breast, with radiologically acceptable doses were obtained, degree improvement image quality (from...
The crystal structures of RbTiOAsO4, KTiO(Po.58,AS0.42)O4, RbTiOPO4 and (Rbo.465,Ko.535)TiOPO4, all which are orthorhombic (space group Pna2~) isostructural with KTiOPO4, have been determined from single-crystal X-ray diffraction data refined to R factors between 0.027 0.040. results used for an analysis structural trends in crystals the KTiOPO4 family by comparison room-temperature that proposed high-temperature prototypic phase Pnan).
The generalized eikonal of a partially coherent paraxial wave is introduced via differential equation describing the evolution time-averaged intensity. theoretical formalism provides an analytical tool for study imaging systems. It also makes possible quantitative phase retrieval and compositional mapping weakly absorbing samples using phase-contrast with broadband polychromatic radiation known spectral distribution. An experimental demonstration presented reconstruction projected thickness...
Abstract In this work X‐ray microtomography was used to observe fracture and healing processes in a liquid‐based self‐healing thermoplastic material. The method able produce data of sufficient resolution (<10 μm) ∼60 μ m microcapsules containing solvent within polymeric material particular their behavior around crack zone after healing. reconstructed showed the distribution filled several empty matrix Additional color segmentation 3D rendering unambiguously demonstrated large...
ABSTRACT Up‐scaling the elastic properties of digitized rock volumes as obtained from X‐ray computer tomography (CT) imaging via simulations has potential to assist and complement laboratory measurements. This computational up‐scaling approach remains a challenging task overall are not only dependent on individual grains but also hardly resolvable pore spaces between adjacent such micro‐cracks. We develop image workflow based general‐purpose widely available software packages. Particular...
Bioinorganic chemistry is critical to cellular function. Homeostasis of manganese (Mn), for example, essential life. A lack methods direct in situ visualization Mn and other biological metals within intact multicellular eukaryotes limits our understanding management these metals. We provide the first quantitative subcellular endogenous concentrations (spanning two orders magnitude) associated with individual cells nematode, Caenorhabditis elegans.
We report the results of a systematic study phase-contrast X-ray computed tomography in propagation-based and analyser-based modes using specially designed phantoms excised breast tissue samples.The is aimed at quantitative evaluation subsequent optimisation, with respect to detection small tumours tissue, effects phase contrast retrieval on key imaging parameters, such as spatial resolution, contrast-to-noise ratio, dose recently proposed "intrinsic quality" characteristic which combines...
A method is presented for quantitative phase-contrast tomography using unfiltered radiation from a small polychromatic source. The three-dimensional distribution of complex refractive index in monomorphous object reconstructed given single projection image per view angle. reconstruction algorithm achromatic and stable with respect to high-spatial-frequency noise, contrast conventional tomography. density test sample was accurately data collected point-projection x-ray microscope.
Results are presented of a recent experiment at the Imaging and Medical beamline Australian Synchrotron intended to contribute implementation low-dose high-sensitivity three-dimensional mammographic phase-contrast imaging, initially synchrotrons subsequently in hospitals medical imaging clinics. The effect such parameters as X-ray energy, source size, detector resolution, sample-to-detector distance, scanning data processing strategies case propagation-based computed tomography (CT) have...