Efficiency of Lu2SiO5:Ce (LSO) powder phosphor as X-ray to light converter under mammographic imaging conditions

2007 ◽  
Vol 571 (1-2) ◽  
pp. 346-349 ◽  
Author(s):  
S. David ◽  
C. Michail ◽  
I. Valais ◽  
D. Nikolopoulos ◽  
P. Liaparinos ◽  
...  
Keyword(s):  
Powder Phosphor ◽  
X Ray ◽  
Imaging Conditions

syris: a flexible and efficient framework for X-ray imaging experiments simulation

2017 ◽  
Vol 24 (6) ◽  
pp. 1283-1295 ◽  
Author(s):  
Tomáš Faragó ◽  
Petr Mikulík ◽  
Alexey Ershov ◽  
Matthias Vogelgesang ◽  
Daniel Hänschke ◽  
...  
Keyword(s):  
Motion Estimation ◽  
Data Processing ◽  
Graphics Processing Units ◽  
High Speed ◽  
Real Data ◽  
Estimation Accuracy ◽  
Processing Parameter ◽  
X Ray ◽  
X Ray Imaging ◽  
Imaging Conditions

An open-source framework for conducting a broad range of virtual X-ray imaging experiments,syris, is presented. The simulated wavefield created by a source propagates through an arbitrary number of objects until it reaches a detector. The objects in the light path and the source are time-dependent, which enables simulations of dynamic experiments,e.g.four-dimensional time-resolved tomography and laminography. The high-level interface ofsyrisis written in Python and its modularity makes the framework very flexible. The computationally demanding parts behind this interface are implemented in OpenCL, which enables fast calculations on modern graphics processing units. The combination of flexibility and speed opens new possibilities for studying novel imaging methods and systematic search of optimal combinations of measurement conditions and data processing parameters. This can help to increase the success rates and efficiency of valuable synchrotron beam time. To demonstrate the capabilities of the framework, various experiments have been simulated and compared with real data. To show the use case of measurement and data processing parameter optimization based on simulation, a virtual counterpart of a high-speed radiography experiment was created and the simulated data were used to select a suitable motion estimation algorithm; one of its parameters was optimized in order to achieve the best motion estimation accuracy when applied on the real data.syriswas also used to simulate tomographic data sets under various imaging conditions which impact the tomographic reconstruction accuracy, and it is shown how the accuracy may guide the selection of imaging conditions for particular use cases.

scholarly journals Synthesis and Characterization of Oxygen Doped ZnTe for Powder Phosphor Application

2005 ◽  
Vol 20 (9) ◽  
pp. 2510-2515 ◽  
Author(s):  
Z.T. Kang ◽  
H. Menkara ◽  
B.K. Wagner ◽  
C.J. Summers ◽  
V. Valdna
Keyword(s):  
Photoelectron Spectroscopy ◽  
Bulk Crystals ◽  
X Ray Diffraction ◽  
Powder Phosphor ◽  
Moisture Sensitivity ◽  
X Ray ◽  
X Ray Imaging ◽  
Imaging Application ◽  
Zno Doping

The synthesis of efficient ZnTe powder phosphors is very difficult due to its high moisture sensitivity and chemical instability during processing. In this study, an efficient ZnTe:O powder phosphor for x-ray imaging application was successfully synthesized by vacuum firing ZnTe powder prepared from ZnTe bulk crystals ball-milled in an O2 atmosphere. The phosphors were characterized by x-ray diffraction, x-ray photoelectron spectroscopy, photoluminescence, and cathodoluminescence (CL) measurements and found to exhibit a luminescent efficiency three times that of ZnTe:O prepared by ZnO doping. The ZnTe:O samples exhibited a deep red emission centered at 680 nm and a CL decay time of 1.1μs.

Dependency of Imaging Conditions on a Marker Detectability Using kV X-ray Images in the Tracking Irradiation With Vero4DRT (MHI-TM2000)

2012 ◽  
Vol 84 (3) ◽  
pp. S719-S720
Author(s):  
M. Yamada ◽  
K. Takahashi ◽  
A. Sawada ◽  
N. Mukumoto ◽  
Y. Ishihara ◽  
...  
Keyword(s):  
X Ray ◽  
Imaging Conditions

scholarly journals EP-1291: Investigation of well-balanced kV x-ray imaging conditions between skin dose and image quality using Vero4DRT

2013 ◽  
Vol 106 ◽  
pp. S488
Author(s):  
T. Nakai ◽  
A. Sawada ◽  
H. Tanabe ◽  
M. Sueoka ◽  
K. Kubo ◽  
...  
Keyword(s):  
Image Quality ◽  
Skin Dose ◽  
X Ray ◽  
X Ray Imaging ◽  
Imaging Conditions

A simple method for performing scanned TEM on a JEOL 200CX

1986 ◽  
Vol 44 ◽  
pp. 626-627
Author(s):  
H. Colijn ◽  
W.A.T. Clark
Keyword(s):  
Computer Analysis ◽  
Digital Images ◽  
Video Camera ◽  
Simple Method ◽  
X Ray ◽  
Tem Mode ◽  
Diffraction Patterns ◽  
Analysis System ◽  
Set Up ◽  
Imaging Conditions

Computer analysis of TEM images and diffraction patterns has generally required the use of a video camera and frame storage. However, one can achieve the same result with a simple and inexpensive modification to the JEOL ASD system. With this modification, the ASD unit can collect TEM images and diffraction patterns rastered over the existing STEM detector. This modified ASD system can also use our existing x-ray analysis system (TN-2000) with digital beam control (DBC) to acquire images or diffraction patterns for computer analysis at a resolution of up to 512x512 pixels.Without having a video camera and frame store, one is limited to using STEM for collecting digital images. Scanned TEM allows many more options. Because the specimen is viewed in TEM mode, it is easy to adjust the camera length and magnification and to set up the desired imaging conditions. It is also significantly easier to obtain diffraction patterns using scanned TEM than using STEM methods.

Theoretical and Experimental Analyses of the Effects of Composition and Strain on Image Contrast in High-Resolution Transmission Electron Microscopy

1990 ◽  
Vol 48 (1) ◽  
pp. 66-67
Author(s):  
D.F. Sundo ◽  
J.M. Howe
Keyword(s):  
Phase Contrast ◽  
Image Contrast ◽  
X Ray ◽  
X Ray Scattering ◽  
Transmission Electron ◽  
Small Defect ◽  
Quantitative Understanding ◽  
Similar Theory ◽  
Substitutional Atom ◽  
Imaging Conditions

Although the effects of composition and strain on amplitude-contrast images in the TEM have been thoroughly developed, similar theory does not exist for phase-contrast images and only a few specific situations have been treated. The purpose of this research is to develop a quantitative understanding of the effects of composition and strain on phase-contrast images and to test this theory experimentally. A simple defect which can cause both a local change in composition and strain is a substitutional atom. Hence, this defect is treated first, with the expectation that results from this analysis can be extended to predict image contrast from larger defects under certain imaging conditions.X-ray scattering theory indicates that diffuse scattering from point defects due to composition and strain is linearly additive. For small defect concentrations, the scattered intensity Sdiff(k) is given by:

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