scholarly journals X-ray colour imaging

2007 ◽  
Vol 5 (21) ◽  
pp. 477-481 ◽  
Author(s):  
R.J Cernik ◽  
K.H Khor ◽  
C Hansson
Keyword(s):  
Data Collection ◽  
Imaging System ◽  
Detection Efficiency ◽  
Three Dimensional ◽  
Silicon Detector ◽  
Semiconductor Detectors ◽  
X Ray ◽  
Aluminium Powder ◽  
Spatially Resolved ◽  
Diffraction Imaging

A prototype X-ray colour imaging system has been assembled using the principle of tomographic energy-dispersive diffraction imaging (TEDDI). The new system has been tested using samples of nylon-6, aluminium powder and deer antler bone. Non-destructive three-dimensional images of the test objects have been reconstructed on a 300 μm scale with an associated diffraction pattern at each voxel. In addition, the lattice parameters of the polycrystalline material present in the sampled voxels have been determined using full pattern refinement methods. The use of multiple diffracted parallel colour X-ray beams has allowed simultaneous spatially resolved data collection across a plane of the sample. This has simplified the sample scan motion and has improved data collection times by a factor scaling with the number of detector pixels. The TEDDI method is currently limited to thin samples (approx. 1–2 mm) with light atoms owing to the very low detection efficiency of the silicon detector at X-ray energies above 25 keV. We describe how these difficulties can be removed by using semiconductor detectors made from heavier atomic material.

scholarly journals High-Resolution Three-Dimensional X-Ray Microscopy

MRS Bulletin ◽  
2004 ◽  
Vol 29 (3) ◽  
pp. 152-156 ◽  
Author(s):  
Bennett C. Larson ◽  
Bruno Lengeler
Keyword(s):  
Large Angle ◽  
Three Dimensional ◽  
Crystalline Materials ◽  
X Ray ◽  
Spatially Resolved ◽  
Coherent Diffraction Imaging ◽  
Diffraction Imaging ◽  
Ray Projection ◽  
The Individual ◽  
Structure Orientation

AbstractThis issue of MRS Bulletin focuses on the rapid progress that is ongoing in the development of hard x-ray microscopies with three-dimensional spatial resolutions ranging from micrometers to nanometers. The individual articles provide a crosscut of developments in hard x-ray projection tomography microscopy for imaging density and chemical fluctuations in crystalline and noncrystalline materials; large-angle diffractionbased, spatially resolved imaging of local structure, orientation, and strain distributions in crystalline materials; and emerging coherent diffraction imaging for nanometer-range Fourier transform imaging of crystalline and noncrystalline materials.

scholarly journals Three-dimensional imaging of hold baggage for airport security

2014 ◽  
Vol XL-5 ◽  
pp. 331-336
Author(s):  
S. Kolokytha ◽  
R. Speller ◽  
S. Robson
Keyword(s):  
3D Imaging ◽  
Imaging System ◽  
Tomographic Reconstruction ◽  
Three Dimensional ◽  
Handling Time ◽  
Cost Effective ◽  
Airport Security ◽  
X Ray ◽  
Common System ◽  
Close Range

This study describes a cost-effective check-in baggage screening system, based on "on-belt tomosynthesis" (ObT) and close-range photogrammetry, that is designed to address the limitations of the most common system used, conventional projection radiography. The latter's limitations can lead to loss of information and an increase in baggage handling time, as baggage is manually searched or screened with more advanced systems. This project proposes a system that overcomes such limitations creating a cost-effective automated pseudo-3D imaging system, by combining x-ray and optical imaging to form digital tomograms. Tomographic reconstruction requires a knowledge of the change in geometry between multiple x-ray views of a common object. This is uniquely achieved using a close range photogrammetric system based on a small network of web-cameras. This paper presents the recent developments of the ObT system and describes recent findings of the photogrammetric system implementation. Based on these positive results, future work on the advancement of the ObT system as a cost-effective pseudo-3D imaging of hold baggage for airport security is proposed.

scholarly journals Prediction of Android and Gynoid Body Adiposity via a Three-dimensional Stereovision Body Imaging System and Dual-Energy X-ray Absorptiometry

2015 ◽  
Vol 34 (5) ◽  
pp. 367-377 ◽  
Author(s):  
Jane J. Lee ◽  
Jeanne H. Freeland-Graves ◽  
M. Reese Pepper ◽  
Philip R. Stanforth ◽  
Bugao Xu
Keyword(s):  
Imaging System ◽  
Three Dimensional ◽  
Dual Energy ◽  
Body Imaging ◽  
X Ray ◽  
Body Adiposity

Three-dimensional X-ray diffraction imaging of process-induced dislocation loops in silicon

2011 ◽  
Vol 44 (3) ◽  
pp. 526-531 ◽  
Author(s):  
David Allen ◽  
Jochen Wittge ◽  
Jennifer Stopford ◽  
Andreas Danilewsky ◽  
Patrick McNally
Keyword(s):  
Semiconductor Industry ◽  
Three Dimensional ◽  
Crystal Defects ◽  
Three Dimensions ◽  
Dimensional Structure ◽  
Dislocation Loops ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diffraction Imaging ◽  
Relationship Of

In the semiconductor industry, wafer handling introduces micro-cracks at the wafer edge and the causal relationship of these cracks to wafer breakage is a difficult task. By way of understanding the wafer breakage process, a series of nano-indents were introduced both into 20 × 20 mm (100) wafer pieces and into whole wafers as a means of introducing controlled strain. Visualization of the three-dimensional structure of crystal defects has been demonstrated. The silicon samples were then treated by various thermal anneal processes to initiate the formation of dislocation loops around the indents. This article reports the three-dimensional X-ray diffraction imaging and visualization of the structure of these dislocations. A series of X-ray section topographs of both the indents and the dislocation loops were taken at the ANKA Synchrotron, Karlsruhe, Germany. The topographs were recorded on a CCD system combined with a high-resolution scintillator crystal and were measured by repeated cycles of exposure and sample translation along a direction perpendicular to the beam. The resulting images were then rendered into three dimensions utilizing open-source three-dimensional medical tomography algorithms that show the dislocation loops formed. Furthermore this technique allows for the production of a video (avi) file showing the rotation of the rendered topographs around any defined axis. The software also has the capability of splitting the image along a segmentation line and viewing the internal structure of the strain fields.

scholarly journals Development of an X-ray real-time stereo imaging technique using synchrotron radiation

2011 ◽  
Vol 18 (4) ◽  
pp. 569-574 ◽  
Author(s):  
Masato Hoshino ◽  
Kentaro Uesugi ◽  
James Pearson ◽  
Takashi Sonobe ◽  
Mikiyasu Shirai ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Real Time ◽  
Imaging System ◽  
Silicon Crystal ◽  
Three Dimensional ◽  
Stereo Image ◽  
Large Field ◽  
Depth Information ◽  
Stereo Imaging ◽  
X Ray

An X-ray stereo imaging system with synchrotron radiation was developed at BL20B2, SPring-8. A portion of a wide X-ray beam was Bragg-reflected by a silicon crystal to produce an X-ray beam which intersects with the direct X-ray beam. Samples were placed at the intersection point of the two beam paths. X-ray stereo images were recorded simultaneously by a detector with a large field of view placed close to the sample. A three-dimensional wire-frame model of a sample was created from the depth information that was obtained from the lateral positions in the stereo image. X-ray stereo angiography of a mouse femoral region was performed as a demonstration of real-time stereo imaging. Three-dimensional arrangements of the femur and blood vessels were obtained.

NONDESTRUCTIVE THREE-DIMENSIONAL X-RAY DIFFRACTION IMAGING OF NANOSCALE PARTICLES

2008 ◽  
Vol 01 (02) ◽  
pp. 207-220
Author(s):  
ANDREI Y. NIKULIN ◽  
RUBEN A. DILANIAN ◽  
BRIAN M. GABLE ◽  
BURRY C. MUDDLE ◽  
JAMES R. HESTER ◽  
...  
Keyword(s):  
Three Dimensional ◽  
X Ray Diffraction ◽  
Nanoscale Particles ◽  
X Ray ◽  
Diffraction Imaging

Bragg and Fresnel Diffraction Imaging Using Highly Coherent X-Rays

1998 ◽  
Vol 4 (S2) ◽  
pp. 376-377
Author(s):  
P. Cloetens ◽  
J. Baruchel ◽  
J.P. Guigay ◽  
W. Ludwig ◽  
L. Mancini ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Optical Path Length ◽  
Fresnel Diffraction ◽  
Crystal Defects ◽  
Bragg Diffraction ◽  
X Rays ◽  
Transmitted Beam ◽  
X Ray ◽  
Diffraction Imaging ◽  
Phase Variations

X-ray imaging started over a century ago. For several decades its only form was absorption radiography, in which contrast is due to local variations in beam attenuation. About forty years ago, a new form of X-ray imagery, Bragg-diffraction imaging or X-ray topography, developed into practical use. It directly reveals crystal defects in the bulk of large single crystals, and paved the way to microelectronics by leading to the growth of large, practically perfect, crystals. The advent of third-generation synchrotron radiation sources of X-rays such as ESRF and APS is now making possible, through the coherence of the X-ray beams, a novel form of radiography, in which contrast arises from phase variations across the transmitted beam, associated with optical path length differences, through Fresnel diffraction. Phase radiography and its three-dimensional companion, X-ray phase tomography, are providing new information on the mechanics of composites as well as on biological materials.

scholarly journals Eclipse mapping at X-ray wavelengths

1996 ◽  
Vol 176 ◽  
pp. 85-94 ◽  
Author(s):  
J.H.M.M. Schmitt
Keyword(s):  
Solar Corona ◽  
Binary Systems ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Similar Amount ◽  
Inversion Problem ◽  
X Ray ◽  
Three Dimensional Structure ◽  
Spatially Resolved ◽  
Rotational Modulation

Stellar coronae cannot be spatially resolved, and yet stellar coronae are likely to exhibit a similar amount of structure as the solar corona. Currently, the only way to infer structure from spatially unresolved data is to look for rotational modulation of the X-ray emission or eclipses in the case of binary systems. I will discuss some of the observations obtained and critically review the methods used to infer structure from these data. Particular emphasis will be placed on the ill-conditioned nature of the inversion problem, that makes it next to impossible to infer the possibly three-dimensional structure of stellar coronae.

scholarly journals Tomosaic: efficient acquisition and reconstruction of teravoxel tomography data using limited-size synchrotron X-ray beams

2018 ◽  
Vol 25 (5) ◽  
pp. 1478-1489 ◽  
Author(s):  
Rafael Vescovi ◽  
Ming Du ◽  
Vincent de Andrade ◽  
William Scullin ◽  
Dogˇa Gürsoy ◽  
...  
Keyword(s):  
Imaging System ◽  
Three Dimensional ◽  
Computing System ◽  
X Rays ◽  
X Ray ◽  
High Penetration ◽  
X Ray Imaging ◽  
Software Modules ◽  
Dimensional Reconstruction ◽  
Tomography Data

X-rays offer high penetration with the potential for tomography of centimetre-sized specimens, but synchrotron beamlines often provide illumination that is only millimetres wide. Here an approach is demonstrated termed Tomosaic for tomographic imaging of large samples that extend beyond the illumination field of view of an X-ray imaging system. This includes software modules for image stitching and calibration, while making use of existing modules available in other packages for alignment and reconstruction. The approach is compatible with conventional beamline hardware, while providing a dose-efficient method of data acquisition. By using parallelization on a distributed computing system, it provides a solution for handling teravoxel-sized or larger datasets that cannot be processed on a single workstation in a reasonable time. Using experimental data, the package is shown to provide good quality three-dimensional reconstruction for centimetre-sized samples with sub-micrometre pixel size.

Sign in / Sign up

Export Citation Format

Share Document