scholarly journals X-ray Fourier ptychography

2019 ◽  
Vol 5 (2) ◽  
pp. eaav0282 ◽  
Author(s):  
Klaus Wakonig ◽  
Ana Diaz ◽  
Anne Bonnin ◽  
Marco Stampanoni ◽  
Anna Bergamaschi ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Collection Efficiency ◽  
Resolving Power ◽  
Contrast Imaging ◽  
Optical Elements ◽  
X Ray ◽  
X Ray Imaging ◽  
Radar Astronomy ◽  
Alternative Approach ◽  
Quantitative Absorption

To a large extent, the performance of imaging systems is determined by their objectives, which affect properties as varied as collection efficiency, resolving power, and image distortions. Such limitations can be addressed by so-called aperture synthesis, a technique used, for instance, in radar, astronomy, and, increasingly, microscopy. Here, we apply such techniques to x-ray imaging and demonstrate how Fourier ptychography can be used at transmission x-ray microscopes to increase resolution, provide quantitative absorption and phase contrast, and allow for corrections of lens aberrations. We anticipate that such methods will find common and frequent applications, alleviating a number of limitations imposed by x-ray optical elements, offering an alternative approach to phase contrast imaging, and providing novel opportunities to mitigate radiation damage.

scholarly journals Principles of Different X-ray Phase-Contrast Imaging: A Review

2021 ◽  
Vol 11 (7) ◽  
pp. 2971
Author(s):  
Siwei Tao ◽  
Congxiao He ◽  
Xiang Hao ◽  
Cuifang Kuang ◽  
Xu Liu
Keyword(s):  
Biological Samples ◽  
Phase Contrast ◽  
Recent Progress ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
X Ray Imaging ◽  
Internal Structures ◽  
X Ray Absorption ◽  
Made In

Numerous advances have been made in X-ray technology in recent years. X-ray imaging plays an important role in the nondestructive exploration of the internal structures of objects. However, the contrast of X-ray absorption images remains low, especially for materials with low atomic numbers, such as biological samples. X-ray phase-contrast images have an intrinsically higher contrast than absorption images. In this review, the principles, milestones, and recent progress of X-ray phase-contrast imaging methods are demonstrated. In addition, prospective applications are presented.

Design, development and first experiments on the X-ray imaging beamline at Indus-2 synchrotron source RRCAT, India

2015 ◽  
Vol 22 (6) ◽  
pp. 1531-1539 ◽  
Author(s):  
A. K. Agrawal ◽  
B. Singh ◽  
Y. S. Kashyap ◽  
M. Shukla ◽  
P. S. Sarkar ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Imaging Techniques ◽  
Phase Contrast Imaging ◽  
Design Development ◽  
Contrast Imaging ◽  
Synchrotron Source ◽  
Full Field ◽  
X Ray ◽  
X Ray Imaging ◽  
Micro Tomography

A full-field hard X-ray imaging beamline (BL-4) was designed, developed, installed and commissioned recently at the Indus-2 synchrotron radiation source at RRCAT, Indore, India. The bending-magnet beamline is operated in monochromatic and white beam mode. A variety of imaging techniques are implemented such as high-resolution radiography, propagation- and analyzer-based phase contrast imaging, real-time imaging, absorption and phase contrast tomographyetc. First experiments on propagation-based phase contrast imaging and micro-tomography are reported.

The feasibility of utilizing the mid-energy in-line phase-contrast imaging system in the breast x-ray imaging

2020 ◽  
Author(s):  
Farid H. Omoumi ◽  
Muhammad U. Ghani ◽  
Molly D. Wong ◽  
Yuchen Qiu ◽  
Yuhua Li ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Imaging System ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
X Ray Imaging

scholarly journals Laboratory-based X-ray phase-contrast imaging with misaligned optical elements

2015 ◽  
Vol 107 (12) ◽  
pp. 124103 ◽  
Author(s):  
Marco Endrizzi ◽  
Dario Basta ◽  
Alessandro Olivo
Keyword(s):  
Phase Contrast ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
Optical Elements ◽  
X Ray

scholarly journals X-Ray Phase-Contrast Imaging with Three 2D Gratings

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
Ming Jiang ◽  
Christopher Lee Wyatt ◽  
Ge Wang
Keyword(s):  
Numerical Simulation ◽  
Phase Contrast ◽  
Phase Retrieval ◽  
Phase Contrast Imaging ◽  
Talbot Effect ◽  
Contrast Imaging ◽  
Preclinical Imaging ◽  
X Ray ◽  
X Ray Imaging ◽  
Contrast Mechanism

X-ray imaging is of paramount importance for clinical and preclinical imaging but it is fundamentally restricted by the attenuation-based contrast mechanism, which has remained essentially the same since Roentgen's discovery a century ago. Recently, based on the Talbot effect, groundbreaking work was reported using 1D gratings for X-ray phase-contrast imaging with a hospital-grade X-ray tube instead of a synchrotron or microfocused source. In this paper, we report an extension using 2D gratings that reduces the imaging time and increases the accuracy and robustness of phase retrieval compared to current grating-based phase-contrast techniques. Feasibility is demonstrated via numerical simulation.

X-Ray Phase-Contrast Tomography for Quantitative Characterisation of Self-Healing Polymers

2010 ◽  
Vol 654-656 ◽  
pp. 2322-2325 ◽  
Author(s):  
Sheridan Mayo ◽  
Andrew Stevenson ◽  
Stephen Wilkins ◽  
Da Chao Gao ◽  
Steven Mookhoek ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Three Dimensional ◽  
Polymer System ◽  
Self Healing ◽  
Contrast Imaging ◽  
X Ray ◽  
X Ray Imaging ◽  
Quantitative Characterisation ◽  
Micro Tomography ◽  
Phase Contrast Tomography

X-ray phase-contrast imaging and tomography add an additional dimension to conventional x-ray methods by exploiting the x-ray refraction effects in addition to x-ray absorption in forming an image. This greatly enhances the visibility of edges, voids and boundaries within a sample. It also makes it possible to characterise weakly x-ray absorbing samples which would produce little or no contrast in conventional x-ray imaging. Here we described the application of a laboratory-based x-ray phase-contrast microscope to x-ray micro-tomography of a self-healing polymer system and the quantitative analysis of the resulting three dimensional (3D) datasets to better understand the healing and ageing processes.

Computer simulations of X-ray phase-contrast images and microtomographic observation of tubules in dentin

2020 ◽  
Vol 27 (2) ◽  
pp. 462-467
Author(s):  
T. S. Argunova ◽  
V. G. Kohn ◽  
J.-H. Lim ◽  
Z. V. Gudkina ◽  
E. D. Nazarova
Keyword(s):  
Phase Contrast ◽  
Three Dimensional ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
Dentinal Tubules ◽  
X Ray ◽  
Coherent Synchrotron Radiation ◽  
X Ray Imaging ◽  
Section Structure ◽  
Comparative Examination

An investigation of the problems of X-ray imaging of dentinal tubules is presented. Two main points are addressed. In the first part of this paper, the problem of computer simulating tubule images recorded in a coherent synchrotron radiation (SR) beam has been discussed. A phantom material which involved a two-dimensional lattice of the tubules with parameters similar to those of dentin was considered. By a comparative examination of two approximations, it was found that the method of phase-contrast imaging is valid if the number of tubules along the beam is less than 100. Calculated images from a lattice of 50 × 50 tubules are periodic in free space but depend strongly on the distance between the specimen and the detector. In the second part, SR microtomographic experiments with millimetre-sized dentin samples in a partially coherent beam have been described. Tomograms were reconstructed from experimental projections using a technique for incoherent radiation. The main result of this part is the three-dimensional rendering of the directions of the tubules in a volume of the samples. Generation of the directions is possible because a tomogram shows the positions of the tubules. However, a detailed tubule cross-section structure cannot be restored.

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