scholarly journals High-Sensitivity X-ray Phase Imaging System Based on a Hartmann Wavefront Sensor

2021 ◽  
Vol 7 (1) ◽  
pp. 3
Author(s):  
Ginevra Begani Provinciali ◽  
Martin Piponnier ◽  
Laura Oudjedi ◽  
Xavier Levecq ◽  
Fabrice Harms ◽  
...  
Keyword(s):  
Imaging System ◽  
High Sensitivity ◽  
Test Sample ◽  
Wavefront Sensor ◽  
Reference Image ◽  
High Angular Resolution ◽  
Phase Imaging ◽  
X Ray ◽  
Laboratory Setup ◽  
The Impact

The Hartman wavefront sensor can be used for X-ray phase imaging with high angular resolution. The Hartmann sensor is able to retrieve both the phase and absorption from a single acquisition. The system calculates the shift in a series of apertures imaged with a detector with respect to their reference positions. In this article, the impact of the reference image on the final image quality is investigated using a laboratory setup. Deflection and absorption images of the same sample are compared using reference images acquired in air and in water. It can be easily coupled with tomographic setups to obtain 3D images of both phase and absorption. Tomographic images of a test sample are shown, where deflection images revealed details that were invisible in absorption. The findings reported in this paper can be used for the improvement of image reconstruction and for expanding the applications of X-ray phase imaging towards materials characterization and medical imaging.

Recent Development of Cone-Beam X-Ray Microtomography at Sunyab

1997 ◽  
Vol 3 (S2) ◽  
pp. 1125-1126
Author(s):  
S.J. Pan ◽  
A. Shih ◽  
W.S. Liou ◽  
M.S. Park ◽  
G. Wang ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Imaging System ◽  
Tomographic Reconstruction ◽  
Ccd Camera ◽  
Test Sample ◽  
Glass Beads ◽  
Cone Beam ◽  
Projection Data ◽  
X Ray ◽  
Cooled Ccd

An experimental X-ray cone-beam microtomographic imaging system utilizing a generalized Feldkamp reconstruction algorithm has been developed in our laboratory. This microtomographic imaging system consists of a conventional dental X-ray source (Aztech 65, Boulder, CO), a sample position and rotation stage, an X-ray scintillation phosphor screen, and a high resolution slow scan cooled CCD camera (Kodak KAF 1400). A generalized Feldkamp cone-beam algorithm was used to perform tomographic reconstruction from cone-beam projection data. This algorithm was developed for various hardware configuration to perform reconstruction of spherical, rod-shaped and plate-like specimen.A test sample consists of 8 glass beads (approx. 800μm in diameter) dispersed in an epoxy-filled #0 gelatin capsule. One hundred X-ray projection images were captured equal angularly (at 3.6 degree spacing) by the cooled CCD camera at a of 1317×967 (17×17mm2) pixels with 12-bit dynamic range. Figure 1 shows a 3D isosurface rendering of the test sample. The eight glass beads and trapped air bubbles (arrows) in the epoxy resin (e) are clearly visible.

Development of simulations for a mesh-based x-ray phase imaging system

2020 ◽  
Author(s):  
Laila Hassan ◽  
Uttam Pyakurel ◽  
Weiyuan Sun ◽  
Carolyn A. MacDonald ◽  
Jonathan C. Petruccelli
Keyword(s):  
Imaging System ◽  
Phase Imaging ◽  
X Ray

scholarly journals Medicine, material science and security: the versatility of the coded-aperture approach

2014 ◽  
Vol 372 (2010) ◽  
pp. 20130029 ◽  
Author(s):  
P. R. T. Munro ◽  
M. Endrizzi ◽  
P. C. Diemoz ◽  
C. K. Hagen ◽  
M. B. Szafraniec ◽  
...  
Keyword(s):  
Materials Science ◽  
Imaging System ◽  
Quantitative Imaging ◽  
Small Animal Imaging ◽  
Small Animal ◽  
Industrial Applications ◽  
Coded Aperture ◽  
Phase Imaging ◽  
Destructive Testing ◽  
X Ray

The principal limitation to the widespread deployment of X-ray phase imaging in a variety of applications is probably versatility. A versatile X-ray phase imaging system must be able to work with polychromatic and non-microfocus sources (for example, those currently used in medical and industrial applications), have physical dimensions sufficiently large to accommodate samples of interest, be insensitive to environmental disturbances (such as vibrations and temperature variations), require only simple system set-up and maintenance, and be able to perform quantitative imaging. The coded-aperture technique, based upon the edge illumination principle, satisfies each of these criteria. To date, we have applied the technique to mammography, materials science, small-animal imaging, non-destructive testing and security. In this paper, we outline the theory of coded-aperture phase imaging and show an example of how the technique may be applied to imaging samples with a practically important scale.

Application of Imaging Plate for X-Ray Diffractometry

1991 ◽  
Vol 35 (A) ◽  
pp. 407-413 ◽  
Author(s):  
Atsushi Shibata ◽  
Katsunari Sasaki ◽  
Takao Kinefuchi
Keyword(s):  
Structure Analysis ◽  
Dynamic Range ◽  
Imaging System ◽  
High Sensitivity ◽  
Effective Area ◽  
Superior Performance ◽  
Imaging Plate ◽  
X Ray ◽  
X Ray Imaging ◽  
Electric Device

AbstractThe Fuji Imaging Plate (IP) is a 2-dimensional detector in which a latent X-ray image is stored as a distribution of color centers on a photostimulable phosphor (BaFBr:Eu2+) screen. It has a large effective area, wide dynamic range and high sensitivity. Thus it has been widely used not only in medical but also in scientific and industrial fields. Particularly in X-ray structure analysis, mainly of proteins, it has been used extensively and achieved good results.On the other hand, few applications have been reported in the field except for structure analysis, in spite of the superior performance of the IP which will give significant advantages in various measurements which have been done using an X-ray film such as electric device and fiber specimen.Therefore we report here the basic performance of R-AXIS II(Rigaku Automated X-Ray Imaging System II), an IP reader made by Rigaku, and some applications of X-ray diffraction measurements using IP.

scholarly journals Thin Shell, Segmented X-Ray Mirrors

2010 ◽  
Vol 2010 ◽  
pp. 1-16 ◽  
Author(s):  
R. Petre
Keyword(s):  
Angular Resolution ◽  
Imaging System ◽  
Broad Band ◽  
Thin Foil ◽  
Substantial Improvement ◽  
High Angular Resolution ◽  
X Ray ◽  
Performance Improvements ◽  
Glass Substrates ◽  
Astronomical Imaging

Thin foil mirrors were introduced as a means of achieving high throughput in an X-ray astronomical imaging system in applications for which high angular resolution was not necessary. Since their introduction, their high filling factor, modest mass, relative ease of construction, and modest cost have led to their use in numerous X-ray observatories, including the Broad Band X-ray Telescope, ASCA, and Suzaku. The introduction of key innovations, including epoxy replicated surfaces, multilayer coatings, and glass mirror substrates, has led to performance improvements and in their becoming widely used for X-ray astronomical imaging at energies above 10 keV. The use of glass substrates has also led to substantial improvement in angular resolution and thus their incorporation into the NASA concept for the International X-ray Observatory with a planned 3 m diameter aperture. This paper traces the development of foil mirrors from their inception in the 1970s through their current and anticipated future applications.

scholarly journals High-sensitivity imaging and quantification of intratumoral distributions of gold nanoparticles using a benchtop x-ray fluorescence imaging system

2019 ◽  
Vol 44 (21) ◽  
pp. 5314 ◽  
Author(s):  
Nivedh Manohar ◽  
Francisco Reynoso ◽  
Sandun Jayarathna ◽  
Hem Moktan ◽  
Md. Foiez Ahmed ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Fluorescence Imaging ◽  
Imaging System ◽  
High Sensitivity ◽  
X Ray ◽  
Fluorescence Imaging System

scholarly journals SYNTHESIS OF NANOCOMPOSITE FIBERS BASED ON ROCK PITCH AND NANOIRON BY ELECTROSPINNING

REPORTS ◽  
2020 ◽  
Vol 5 (333) ◽  
pp. 19-26
Author(s):  
B.T. Yermagambet ◽  
◽  
M.K. Kazankapova ◽  
Zh.M. Kassenova ◽  
A.T. Nauryzbayeva ◽  
...  
Keyword(s):  
Elemental Composition ◽  
Carbon Nanofiber ◽  
Coal Tar ◽  
Test Sample ◽  
Coal Tar Pitch ◽  
Chemical Bonds ◽  
X Ray ◽  
Laboratory Setup ◽  
Nanocomposite Fibers ◽  
Sample Structure

The article presents experiments on the production of nanocomposite fibers based on the Shubarkol coal tar pitch and nano-iron by the method of electrospinning in a laboratory setup. The elemental composition was determined and the surface morphology of the test sample was studied. As a result of energy dispersive X-ray spectroscopy and SEM microscopy, the elemental composition was determined: C-92.14%, O-6.16%, Al-0.30%, Si-0.26%, P-0.07%, S -0.20%, Cl -0.40%, Fe-0.47% and the diameter of the carbon nanofiber, which ranged from 94.2 nm to 800.0 nm. The results of IR spectroscopy showed an increase in the intensity of the peaks in the region of 2920-2850 cm-1 and the appearance of a signal at 2359 cm-1, which is explained by the breaking of several chemical bonds in the sample structure and the formation of a composite with nano-iron.

Development of simulations for a mesh-based x-ray phase imaging system

2020 ◽  
Author(s):  
Laila Hassan ◽  
Weiyuan Sun ◽  
Carolyn A. MacDonald ◽  
Jonathan C. Petruccelli
Keyword(s):  
Imaging System ◽  
Phase Imaging ◽  
X Ray

scholarly journals Modelling of Phase Contrast Imaging with X-ray Wavefront Sensor and Partial Coherence Beams

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6469 ◽  
Author(s):  
Ginevra Begani Provinciali ◽  
Alessia Cedola ◽  
Ombeline de La Rochefoucauld ◽  
Philippe Zeitoun
Keyword(s):  
Spatial Coherence ◽  
High Sensitivity ◽  
Propagation Model ◽  
Partial Coherence ◽  
Wavefront Sensor ◽  
Contrast Imaging ◽  
Material Density ◽  
X Ray ◽  
Experimental Parameters ◽  
Precise Simulation

The Hartmann wavefront sensor is able to measure, separately and in absolute, the real δ and imaginary part β of the X-ray refractive index. While combined with tomographic setup, the Hartman sensor opens many interesting opportunities behind the direct measurement of the material density. In order to handle the different ways of using an X-ray wavefront sensor in imaging, we developed a 3D wave propagation model based on Fresnel propagator. The model can manage any degree of spatial coherence of the source, thus enabling us to model experiments accurately using tabletop, synchrotron or X-ray free-electron lasers. Beam divergence is described in a physical manner consistent with the spatial coherence. Since the Hartmann sensor can detect phase and absorption variation with high sensitivity, a precise simulation tool is thus needed to optimize the experimental parameters. Examples are displayed.

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