High density resolution in synchrotron-radiation-based attenuation-contrast microtomography

2008 ◽  
Author(s):  
Felix Beckmann ◽  
Julia Herzen ◽  
Astrid Haibel ◽  
Bert Müller ◽  
Andreas Schreyer
Keyword(s):  
Synchrotron Radiation ◽  
High Density ◽  
Density Resolution

scholarly journals High density terahertz frequency comb produced by coherent synchrotron radiation

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
S. Tammaro ◽  
O. Pirali ◽  
P. Roy ◽  
J.-F. Lampin ◽  
G. Ducournau ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Frequency Comb ◽  
High Density ◽  
Terahertz Frequency ◽  
Coherent Synchrotron Radiation

Grazing Incidence X-Ray Spectroscopy for Thin Layer Analysis

1991 ◽  
Vol 35 (B) ◽  
pp. 807-812
Author(s):  
Hideki Hashimoto ◽  
Hiroshi Nishioji ◽  
Hideo Saisho
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Synchrotron Radiation ◽  
Grazing Incidence ◽  
High Density ◽  
Homogeneous Layer ◽  
Treatment Results ◽  
Titanium Layer ◽  
X Ray ◽  
Layer Analysis

AbstractReflection and fluorescence intensity profile curves for thin films were measured under the grazing incidence conditions using synchrotron radiation. A titanium layer and a carbon / titanium bilayer sputtered on a silicon wafer were subjected to heat treatment. The analysis of the reflection and fluorescence profile curves shows that the sample without the heat treatment has another high-density layer on the surface or interface, and that the heat treatment results in the removal of the high-density layer and the formation of a thick homogeneous layer.

scholarly journals Nanocavitation mechanisms in deformed High Density PolyEthylene (HDPE) using synchrotron radiation NanoTomography

Polymer ◽  
2021 ◽  
pp. 123959
Author(s):  
Cristian Ovalle ◽  
Peter Cloetens ◽  
Henry Proudhon ◽  
Thilo F. Morgeneyer ◽  
Lucien Laiarinandrasana
Keyword(s):  
Synchrotron Radiation ◽  
High Density Polyethylene ◽  
High Density

Twinning model for a new pseudo-hexagonal BN

1994 ◽  
Vol 209 (3) ◽  
Author(s):  
V. Kupcik ◽  
J. Grochowski ◽  
P. Serda
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
Boron Nitride ◽  
Diffraction Data ◽  
Structure Refinement ◽  
High Density ◽  
Hexagonal Modification

AbstractA model for a twin consisting of two domains is proposed for a new pseudo-hexagonal modification of high-density boron nitride. A structure refinement based on high resolution diffraction data taken with 0.5 Å synchrotron radiation resulted in

Design of CT Reconstruction Software Based on the Air Container CT Inspection System

2009 ◽  
Author(s):  
Jinhui Liu ◽  
Xincheng Xiang ◽  
Zhifang Wu
Keyword(s):  
Gamma Ray ◽  
Ct Images ◽  
High Density ◽  
Inspection System ◽  
Projection Data ◽  
Ct Image ◽  
Ct Reconstruction ◽  
Ct Scanner ◽  
Reconstruction Software ◽  
Density Resolution

The air container CT inspection system has been developed as a high space-resolution, high density-resolution CT scanner. The design of CT reconstruction software based on the system uses the back project algorithm to construct the CT images, and the filter functions are also included to process the CT data. Because the system can be used to inspect the large objects that cannot be penetrated easily by gamma-ray, the reconstructed CT images may have some artifacts that may damage CT image. The digital subtraction method is used to realize the CT reconstruction for the edge parts of large object that has big gamma-ray attenuation in the center part of the object. The nonlinear effect while measuring is corrected using serials of thin ion plates. The CT images for large objects are improved obviously by using the plate correction. The CT images based on the back project algorithm are also obtained by using the non-perfect projection data. The obtained CT image can have a certain precision to meet the demand. And the principal of the CT reconstruction using the non-perfect project data is also analyzed. The noise influence to the CT imaging quality is also analyzed. Different kinds of noises were added to the signals of all channels or selected channel. The experiment showed that the CT construction realized by the paper has high density resolution and high spatial resolution. The designing for CT construction software is successful.

Abstract 12503: Synchrotron Radiation Coronary Microangiography for Evaluating Changes in the Caliber of the in vivo Rat Coronary Artery After Endothelin Administration

Circulation ◽  
2014 ◽  
Vol 130 (suppl_2) ◽  
Author(s):  
Hiroaki Sakamoto ◽  
Shonosuke Matsushita ◽  
Kazuyuki Hyodo ◽  
Chiho Tokunaga ◽  
Fujio Sato ◽  
...  
Keyword(s):  
Heart Disease ◽  
Coronary Artery ◽  
Synchrotron Radiation ◽  
Regenerative Medicine ◽  
Ischemic Heart Disease ◽  
Coronary Arteries ◽  
High Energy ◽  
Ischemic Heart ◽  
Density Resolution

Background: Conventional coronary angiography can visualize vessels of 300 μm in diameter, but not those of smaller diameter, such as the proliferating collateral arteries of ischemic heart disease and the new blood vessels formed in regenerative medicine. We have developed a system of synchrotron radiation coronary microangiography (SRCA) in the in vivo rat. The purpose of this study was to define the minimum detectable caliber change in the coronary arteries of the in vivo rat by inducing vasoconstriction with endothelin during SRCA. Method: SRCA was performed at the Photon Factory of the High Energy Accelerator Research Organization (Tsukuba, Japan). The advantages of synchrotron radiation derived X-rays are high spatial resolution (5 μm/pixel) due to increased photon density and straightness of beam. High density resolution is obtained with a high-gain avalanche rushing amorphous photoconductor camera using a fiber-optic plate. Rats were anesthetized. The polyethylene tube for angiography was inserted into the carotid artery. SRCA was performed before and after endothelin administration. Results: The electrocardiography showed ST elevation after endothelin administration. High spatial and density resolution images were obtained. Figures A and B show the changes in the caliber of the coronary arteries: Figure A shows the arteries before endothelin administration, and Figure B shows them after endothelin administration. The minimum identified coronary artery diameter in the in vivo rat was 65 μm, and the minimum detectable caliber change was 20 μm. Conclusion: The SRCA system could confirm the microvascular constriction of the coronary arteries in the in vivo rat after endothelin administration. We plan next to use SRCA to evaluate endothelial dysfunction in diabetic rats. SRCA may aid investigation of collateral artery proliferation in ischemic heart disease and new blood vessel formation in regenerative medicine in the near future.

Planar defects in ordered (Ga,In)P

1988 ◽  
Vol 46 ◽  
pp. 902-903
Author(s):  
S. McKernan ◽  
C. B. Carter ◽  
D. Bour ◽  
J. R. Shealy
Keyword(s):  
Electron Diffraction ◽  
Vapor Phase ◽  
Growth Direction ◽  
High Density ◽  
Ordered Structure ◽  
Planar Defects ◽  
Diffraction Patterns ◽  
Ternary Semiconductors ◽  
Anion Species ◽  
Metallic Vapor

The growth of ternary III-V semiconductors by organo-metallic vapor phase epitaxy (OMVPE) is widely practiced. It has been generally assumed that the resulting structure is the same as that of the corresponding binary semiconductors, but with the two different cation or anion species randomly distributed on their appropriate sublattice sites. Recently several different ternary semiconductors including AlxGa1-xAs, Gaxln-1-xAs and Gaxln1-xP1-6 have been observed in ordered states. A common feature of these ordered compounds is that they contain a relatively high density of defects. This is evident in electron diffraction patterns from these materials where streaks, which are typically parallel to the growth direction, are associated with the extra reflections arising from the ordering. However, where the (Ga,ln)P epilayer is reasonably well ordered the streaking is extremely faint, and the intensity of the ordered spot at 1/2(111) is much greater than that at 1/2(111). In these cases it is possible to image relatively clearly many of the defects found in the ordered structure.

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