scholarly journals A Tunable Energy Filter for Medical X-Ray Imaging

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
Erik Fredenberg ◽  
Björn Cederström ◽  
Magnus Åslund ◽  
Carolina Ribbing ◽  
Mats Danielsson
Keyword(s):  
Energy Spectrum ◽  
Ray Tracing ◽  
Geometrical Model ◽  
Experimental Setup ◽  
X Ray ◽  
Optimal Energy ◽  
Energy Filtering ◽  
Scan Time ◽  
X Ray Imaging ◽  
Chromatic Properties

A multiprism lens (MPL) is a refractive X-ray lens, and its chromatic properties can be employed in an energy filtering setup to obtain a narrow tunable X-ray spectrum. We present the first evaluation of such a filter for medical X-ray imaging. The experimental setup yields a 6.6 gain of flux at 20 keV, and we demonstrate tunability by altering the energy spectrum to center also around 17 and 23 keV. All measurements are found to agree well with ray-tracing and a proposed geometrical model. Compared to a model mammography system with absorption filtering, the experimental MPL filter reduces dose 13–25% for 3–7 cm breasts if the spectrum is centered around the optimal energy. Additionally, the resolution is improved 2.5 times for a 5 cm breast. The scan time is increased 3 times but can be reduced with a slightly decreased energy filtering and resolution.

Correction and verification of x-ray imaging crystal spectrometer analysis on Wendelstein 7-X through x-ray ray tracing

2021 ◽  
Vol 92 (4) ◽  
pp. 043530
Author(s):  
N. A. Pablant ◽  
A. Langenberg ◽  
J. A. Alonso ◽  
M. Bitter ◽  
S. A. Bozhenkov ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Crystal Spectrometer ◽  
X Ray ◽  
X Ray Imaging

scholarly journals A novel experimental setup for in situ optical and X-ray imaging of laser sintering of polymer particles

2019 ◽  
Vol 90 (8) ◽  
pp. 083905 ◽  
Author(s):  
Prakhyat Hejmady ◽  
Lucien C. Cleven ◽  
Lambèrt C. A. van Breemen ◽  
Patrick D. Anderson ◽  
Ruth Cardinaels
Keyword(s):  
Laser Sintering ◽  
Experimental Setup ◽  
Polymer Particles ◽  
X Ray ◽  
X Ray Imaging

scholarly journals Initial Results of X-ray Imaging and Energy Spectrum Measurements of Hot Electron Plasmas in RT-1

2009 ◽  
Vol 4 ◽  
pp. 050-050 ◽  
Author(s):  
Haruhiko SAITOH ◽  
Yoshihisa YANO ◽  
Tatsunori MIZUSHIMA ◽  
Junji MORIKAWA ◽  
Zensho YOSHIDA
Keyword(s):  
Energy Spectrum ◽  
Hot Electron ◽  
X Ray ◽  
Electron Plasmas ◽  
X Ray Imaging ◽  
Spectrum Measurements ◽  
Initial Results

scholarly journals Bent Laue crystal anatomy: new insights into focusing and energy-dispersion properties

2021 ◽  
Vol 54 (2) ◽  
pp. 409-426
Author(s):  
Peng Qi ◽  
Xianbo Shi ◽  
Nazanin Samadi ◽  
Dean Chapman
Keyword(s):  
Ray Tracing ◽  
Imaging Techniques ◽  
Point Of View ◽  
Energy Dispersion ◽  
General Behaviour ◽  
X Ray ◽  
Spatial Properties ◽  
X Ray Imaging ◽  
Special Cases ◽  
Intuitive View

X-ray Laue-type monochromators are common and essential optical components at many high-power X-ray facilities, e.g. synchrotron facilities. The X-ray optics of bent Laue crystals is a well developed area. An incident X-ray beam penetrating a bent Laue crystal will result in a diffracted beam with different angles and energies. There is a need for a way of organizing the rays that allows one to sort out the energy and spatial properties of the diffracted beam. The present work introduces a new approach for describing the general behaviour of bent Laue crystals from a ray-tracing point of view. This quasi-monochromatic beam approach provides an intuitive view of bent-crystal diffraction and leads to deeper understanding. It explains the energy and spatial properties of common and special cases of bent Laue optics, predicts phenomena that can improve energy-dispersion-related X-ray imaging techniques and provides a theoretical framework that makes ray-tracing simulation easier to realize.

scholarly journals Continuous scanning for Bragg coherent X-ray imaging

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ni Li ◽  
Maxime Dupraz ◽  
Longfei Wu ◽  
Steven J. Leake ◽  
Andrea Resta ◽  
...  
Keyword(s):  
Flow Reactor ◽  
Light Sources ◽  
Pt Nanoparticle ◽  
Strain Fields ◽  
X Ray ◽  
Coherent Diffraction Imaging ◽  
Scan Time ◽  
X Ray Imaging ◽  
Continuous Scanning ◽  
Diffraction Imaging

Abstract We explore the use of continuous scanning during data acquisition for Bragg coherent diffraction imaging, i.e., where the sample is in continuous motion. The fidelity of continuous scanning Bragg coherent diffraction imaging is demonstrated on a single Pt nanoparticle in a flow reactor at $$400\,^\circ \hbox {C}$$ 400 ∘ C in an Ar-based gas flowed at 50 ml/min. We show a reduction of 30% in total scan time compared to conventional step-by-step scanning. The reconstructed Bragg electron density, phase, displacement and strain fields are in excellent agreement with the results obtained from conventional step-by-step scanning. Continuous scanning will allow to minimise sample instability under the beam and will become increasingly important at diffraction-limited storage ring light sources.

scholarly journals Different Sizes of Windows for Energy Spectrum of a Photon Counting X-ray Imaging System

2012 ◽  
Vol 39 (10) ◽  
pp. 8-13
Author(s):  
Muhammad MasoodSarfaraz ◽  
Aamir Khan ◽  
Farah Batool ◽  
Adeel Akram ◽  
Farman Ullah
Keyword(s):  
Energy Spectrum ◽  
Imaging System ◽  
Photon Counting ◽  
X Ray ◽  
X Ray Imaging

Quantitative characterization of the contrast mechanisms of ultra-small-angle X-ray scattering imaging

2008 ◽  
Vol 41 (2) ◽  
pp. 416-427 ◽  
Author(s):  
F. Zhang ◽  
G. G. Long ◽  
L. E. Levine ◽  
J. Ilavsky ◽  
P. R. Jemian
Keyword(s):  
Ray Tracing ◽  
Small Angle ◽  
Diffraction Theory ◽  
X Ray ◽  
X Ray Scattering ◽  
X Ray Imaging ◽  
Contrast Mechanism ◽  
Good Agreement ◽  
Ray Scattering

A general treatment of X-ray imaging contrast for ultra-small-angle X-ray scattering (USAXS) imaging is presented; this approach makes use of phase propagation and dynamical diffraction theory to account quantitatively for the intensity distribution at the detector plane. Simulated results from a model system of micrometre-sized spherical SiO2particles embedded in a polypropylene matrix show good agreement with experimental measurements. Simulations by means of a separate geometrical ray-tracing method also account for the features in the USAXS images and offer a complementary view of small-angle X-ray scattering as a contrast mechanism. The ray-tracing analysis indicates that refraction, in the form of Porod scattering, and, to a much lesser extent, X-ray reflection account for the USAXS imaging contrast.

Multi-threshold window discriminator based on SAR logic

2022 ◽  
Vol 17 (01) ◽  
pp. C01042
Author(s):  
J. Jirsa ◽  
M. Marcisovsky ◽  
J. Jakovenko
Keyword(s):  
Computed Tomography ◽  
Energy Spectrum ◽  
Successive Approximation ◽  
Material Testing ◽  
X Ray ◽  
Front End ◽  
X Ray Imaging ◽  
Imaging Detectors ◽  
Non Destructive ◽  
Novel Design

Abstract The new X-ray imaging detectors allow capturing an X-ray image in various photon energy ranges in one shot. This technique is called X-ray color imaging, and it is becoming a promising method in fields such as medical imaging, computed tomography, and non-destructive material testing. To measure the energy spectrum in one shot, discriminant circuits need to be integrated into the pixel front-end electronics. Several solutions of in-pixel discriminators exist. However, current designs suffer from a low number of discrimination bins and need to adjust each threshold separately, leading to relatively complicated calibration procedures. This work introduces a novel design of a multi-threshold window discriminator based on successive approximation register logic. This circuit realizes in-pixel binning to ten equidistant windows. Two variables are used for tuning the multi-threshold window discriminator: offset of the first window and width of the windows. Setting these parameters allows the user to fulfill the need of the target application.

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