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X Ray Phase Contrast And Dark Field Imaging In Single Shot And Scanning Mode
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Book Synopsis X-ray Phase-Contrast Imaging Using Near-Field Speckles by : Marie-Christine Zdora
Download or read book X-ray Phase-Contrast Imaging Using Near-Field Speckles written by Marie-Christine Zdora and published by Springer. This book was released on 2022-02-18 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents research on novel X-ray imaging methods that improve the study of specimens with small density differences, revealing their inner structure and density distribution. Exploiting the phase shift of X-rays in a material can significantly increase the image contrast compared to conventional absorption imaging. This thesis provides a practical guide to X-ray phase-contrast imaging with a strong focus on X-ray speckle-based imaging, the most recently developed phase-sensitive method. X-ray speckle-based imaging only requires a piece of abrasive paper in addition to the standard X-ray imaging setup. Its simplicity and robustness combined with the compatibility with laboratory X-ray sources, make it an ideal candidate for wide user uptake in a range of fields. An in-depth overview of the state of the art of X-ray speckle-based imaging and its latest developments is given in this thesis. It, furthermore, explores a broad range of applications, from X-ray optics characterisation, to biomedical imaging for 3D virtual histology and geological studies of volcanic rocks, demonstrating is promising potential. Moreover, the speckle-based technique is placed in the context of other phase-sensitive X-ray imaging methods to assist in the choice of a suitable method, hence serving as a guide and reference work for future users.
Book Synopsis Phase-Contrast and Dark-Field Imaging by : Simon Zabler
Download or read book Phase-Contrast and Dark-Field Imaging written by Simon Zabler and published by MDPI. This book was released on 2019-01-08 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Phase-Contrast and Dark-Field Imaging" that was published in J. Imaging
Book Synopsis X-ray Phase-contrast and Dark-field Imaging in Single-shot and Scanning Mode by : Maria Theresa Seifert
Download or read book X-ray Phase-contrast and Dark-field Imaging in Single-shot and Scanning Mode written by Maria Theresa Seifert and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phase-Contrast and Dark-Field Imaging by : Simon Zabler
Download or read book Phase-Contrast and Dark-Field Imaging written by Simon Zabler and published by . This book was released on 2018 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The intent of this Special Issue is to provide a framework with which scientists in several different disciplines, related to phase-contrast and dark-field imaging, can illustrate their ideas and results. The articles are reviews or very recent scientific reports; they address newcomers in the field, as well as experts and professors in fields of X-ray physics, electron, and phase-contrast X-ray imaging.
Book Synopsis High Energy X-ray Implementation of Phase Contrast and Dark Field Imaging by : Ian Buchanan
Download or read book High Energy X-ray Implementation of Phase Contrast and Dark Field Imaging written by Ian Buchanan and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Differential Phase Contrast Imaging in the Scanning Transmission X-Ray Micro Scope by : J. R. Palmer
Download or read book Differential Phase Contrast Imaging in the Scanning Transmission X-Ray Micro Scope written by J. R. Palmer and published by . This book was released on 1992 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Calculations of the contrast transfer functions for differential phase contrast imaging are presented and compared to those for absorption imaging in the x-ray microscope. In the scanning transmission x-ray microscope (STXM) the specimen is scanned in a raster by an x-ray probe formed with a Fresnel zone plate. To achieve near diffraction limited resolution it is necessary to have a coherent source, even when forming an incoherent brightfield image by measuring the x-ray intensity transmitted by the object. This has so far been the only imaging mode used in the STXM and for hydrated biological specimens is well suited to soft x-ray wavelengths within the water window (2.33 to 4.36 nm) where carbon absorbs much more strongly than water. However, by the use of phase contrast rather than amplitude contrast, it is possible to form images at wavelengths where the absorption is low, resulting in lower radiation dose for the same level of contrast. Calculations have demonstrated very clearly the advantages of phase contrast imaging at wavelengths outside the water window.
Download or read book X-ray Phase Contrast Imaging written by and published by . This book was released on 2012 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Interest in phase sensitive x-ray imaging techniques has grown rapidly in recent years. Numerous techniques have been demonstrated to measure the phase shift of x-rays as they pass through matter. One such method, grating-based interferometry, has shown the most potential for clinical use. This dissertation continues our group's efforts at characterizing the Talbot-Lau interferometer, with the overall goal of determining the clinical utility of the system. This work first covers the basics of x-ray phase contrast imaging with a grating interferometer. Phase contrast imaging with this method has the advantage over conventional absorption imaging in that it allows for the simultaneous measurement of multiple contrast mechanisms. This multi-contrast imaging modality has the potential to improve the diagnostic capabilities of traditional imaging systems. It has unique noise properties that allow it to move to higher spatial resolution at a lower dose penalty, as well as improved contrast for certain material combinations. However, questions still remain about where such a system would fit in the clinical realm. This dissertation delves into new research demonstrating the effects of beam hardening, improving the phase retrieval technique, determining the best method for grating fabrication, and exploring the impact of the small-angle scattering, or dark field, contrast mechanism. Both traditional beam hardening artifacts and new ones are shown, and their implication for clinical systems is discussed. The improved phase retrieval techniques aim at reducing the temporal requirements for the current acquisition method. While most of them succeed at reducing the time requirements, they also all come with an associated cost to the final image. Along with improved signal extraction, improved grating fabrication is discussed. The design and construction of a new grating fabrication system is detailed, demonstrating its capability of both producing absorption gratings with greater metal deposition depths and using cheaper, alternative absorbers. Finally, the impact of the dark-field contrast mechanism is discussed, highlighting the interplay between high-quality, low-noise phase and dark-field images.
Book Synopsis Development of Image Acquisition and Alignment Methods for X-ray Dark-field and Phase-contrast Imaging by : Veronika Ludwig
Download or read book Development of Image Acquisition and Alignment Methods for X-ray Dark-field and Phase-contrast Imaging written by Veronika Ludwig and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phase Contrast X-ray Imaging by : Xizeng Wu
Download or read book Phase Contrast X-ray Imaging written by Xizeng Wu and published by . This book was released on 2007 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Towards Low-dose Spectral Phase-contrast X-ray Imaging by : Korbinian Maximilian Mechlem
Download or read book Towards Low-dose Spectral Phase-contrast X-ray Imaging written by Korbinian Maximilian Mechlem and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Differential Phase Contrast X-ray Imaging System and Components by :
Download or read book Differential Phase Contrast X-ray Imaging System and Components written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A differential phase contrast X-ray imaging system includes an X-ray illumination system, a beam splitter arranged in an optical path of the X-ray illumination system, and a detection system arranged in an optical path to detect X-rays after passing through the beam splitter.
Book Synopsis A Phase Contrast Imaging Technique for Near-field Scanning Optical Microscopy by : Andrew David Woodfin
Download or read book A Phase Contrast Imaging Technique for Near-field Scanning Optical Microscopy written by Andrew David Woodfin and published by . This book was released on 1998 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: A technique allowing for phase contrast imaging with a near-field scanning optical microscope is discussed. Background theory relating to near-field scanning optical microscopy (NSOM) is presented, in addition to relevant aspects of interferometry. A brief discussion of currently available methods for phase contrast imaging in both near-field and far-field microscopy is presented. Theory regarding the proposed technique, which exploits the interference of electrooptically modulated light and a conventional NSOM signal, is discussed in detail. Phase data using the proposed technique in a simplified configuration is presented to validate its effectiveness. The experimental arrangement used for data collection is specified. Finally, phase data obtained using the proposed technique in conjunction with a near-field microscope is examined and assessed in comparison with the results expected from prior knowledge of the sample under study.
Book Synopsis Advances in Phase Contrast Imaging Using Fully and Partially Coherent Wavefields by : Mario Alejandro Beltran Toro
Download or read book Advances in Phase Contrast Imaging Using Fully and Partially Coherent Wavefields written by Mario Alejandro Beltran Toro and published by . This book was released on 2014 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray phase contrast imaging enables the visualization of an object's features that otherwise would be impossible to obtain with conventional absorption based X-ray imaging. The first part of this thesis focuses specifically on propagation-based phase contrast imaging (PBI). It has a particular emphasis on the quantitative image reconstruction under the assumption that the source of illumination is fully coherent. It presents the existing methods of extracting quantitative information as well as original ones developed in this thesis. The second part of this thesis takes a purely theoretical route, which focuses on studying the forward problem of aberrated optical systems under partially coherent illumination. This thesis begins with a general overview and review of the relevant literature including the theory of coherent X-ray wavefield diffraction, partial coherence, phase-contrast X-ray imaging, and phase-contrast tomography. Particular emphasis is given to PBI. We then move to the original work that involved developing a method to carry out quantitative PBI based tomography on multi-material samples using only a single view per tomographic projection. The samples considered here are those for which (i) the complex refractive index of each component of the sample is known, and (ii) the component materials are spatially quantized. The method was applied to tomographic data obtained at the SPring-8 synchrotron facility in Japan. The sample used was a multi-material test phantom. The refractive index distribution of the test phantom was recovered in three dimensions with a single phase contrast image per projection. The method was applied successfully and was very stable under the presence of noise, opening the possibility of significant dose reduction incurred by samples. The next step in this work sees the application of the aforementioned method to complex biological organs. The chosen organs were the thorax of a rabbit pup and an excised rat brain. Experimental data were also acquired at the SPring-8 synchrotron facility in Japan. Tomographic slices containing the refractive index distribution for each organ were reconstructed using a single phase contrast image per projection. Signal-to-noise ratios for each reconstructions showed significant improvements of up 200 fold compared to absorption contrast reconstructions of the same slices. Finally, this thesis treats the problem of arbitrary aberrations in linear shift-invariant optical systems. This involves mathematically establishing a series of expressions considering arbitrary forms of phase contrast modalities as well as taking into account partially coherent illumination. Expressions are presented for the output cross spectral density under the space-frequency formulation of statistically stationary partially coherent fields. This could broaden the applicability of phase contrast to sources of lower quality.
Book Synopsis X-ray Dark-field Imaging for Diagnosis of Pulmonary Disorders by : Andriy Yaroshenko
Download or read book X-ray Dark-field Imaging for Diagnosis of Pulmonary Disorders written by Andriy Yaroshenko and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Alesssandro Olivo Publisher :World Scientific Publishing Company ISBN 13 :9781908977311 Total Pages :220 pages Book Rating :4.9/5 (773 download)
Book Synopsis X-Ray Phase Contrast Imaging by : Alesssandro Olivo
Download or read book X-Ray Phase Contrast Imaging written by Alesssandro Olivo and published by World Scientific Publishing Company. This book was released on 2013-07-31 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book fills an important gap in the existing literature by providing a comprehensive discussion of X-ray Phase Contrast Imaging (XPCi) and its various uses and implementations. XPCi could revolutionise all applications of X-ray imaging. It exploits a different mechanism to generate image contrast (refraction/interference instead of absorption), thus enhancing the visibility of all details, allowing the detection of features that are classically considered invisible. XPCi emerged in the mid-1990s, primarily at synchrotron radiation facilities. Initially, its use was considered to be very restricted due to the stringent requirements imposed on the radiation source. New methods which allow XPCi to be used with conventional X-ray sources have recently emerged, thus providing concrete possibilities for transfer into mainstream applications. This has renewed enthusiasm in the field and spawned a large number of new research groups worldwide. This book follows a historical perspective and describes all possible implementations of XPCi. In each case, the underpinning theory is described, the possible experimental realisations are discussed and the targeted applications listed, with specific mentions of the most significant examples. Although sometimes overlooked, X-ray imaging is all-pervasive in our society: medicine, industrial scans, non-destructive testing, security inspections and a vast number of scientific fields rely heavily on it. Hence, the potential impact of XPCi is immense.
Book Synopsis Advanced Acquisition Methods for Anisotropic X-ray Dark-field Imaging by : Yash Sharma
Download or read book Advanced Acquisition Methods for Anisotropic X-ray Dark-field Imaging written by Yash Sharma and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coherent X-Ray Diffractive Imaging on the Single-celll-Level of Microbial Samples by :
Download or read book Coherent X-Ray Diffractive Imaging on the Single-celll-Level of Microbial Samples written by and published by . This book was released on 2014 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its first experimental demonstration in 1999, Coherent X-Ray Diffractive Imaging has become one of the most promising high resolution X-Ray imaging techniques using coherent radiation produced by brilliant synchrotron storage rings. The ability to directly invert diffraction data with the help of advanced algorithms has paved the way for microscopic investigations and wave-field analyses on the spatial scale of nanometres without the need for inefficient imaging lenses. X-Ray phase contrast which is a measure of the electron density is an important contrast mode of soft biological spe...
