scholarly journals Tomography of dark‐field scatter including single‐exposure Moiré fringe analysis with X‐ray biprism interferometry—A simulation study

2021 ◽  
Author(s):  
Weijie Tao ◽  
Yongjin Sung ◽  
Sally Ji Who Kim ◽  
Qiu Huang ◽  
Grant T. Gullberg ◽  
...  
Keyword(s):  
Simulation Study ◽  
Dark Field ◽  
Fringe Analysis ◽  
Single Exposure ◽  
X Ray ◽  
Moire Fringe ◽  
Moiré Fringe

scholarly journals Translation from murine to human lung imaging using x-ray dark field radiography: A simulation study

PLoS ONE ◽  
2018 ◽  
Vol 13 (10) ◽  
pp. e0206302 ◽  
Author(s):  
Janne Vignero ◽  
Nicholas W. Marshall ◽  
Greetje Vande Velde ◽  
Kristina Bliznakova ◽  
Hilde Bosmans
Keyword(s):  
Simulation Study ◽  
Human Lung ◽  
Dark Field ◽  
Lung Imaging ◽  
X Ray

scholarly journals Simulation study towards quantitative X-ray and neutron tensor tomography regarding the validity of linear approximations of dark-field anisotropy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jonas Graetz
Keyword(s):  
Simulation Study ◽  
Full Range ◽  
Dark Field ◽  
Orientation Dependence ◽  
Field Tensor ◽  
Axis Orientation ◽  
X Ray ◽  
Tensor Tomography ◽  
Order Of Magnitude ◽  
Linear Contrast

AbstractTensor tomography is fundamentally based on the assumption of a both anisotropic and linear contrast mechanism. While the X-ray or neutron dark-field contrast obtained with Talbot(-Lau) interferometers features the required anisotropy, a preceding detailed study of dark-field signal origination however found its specific orientation dependence to be a non-linear function of the underlying anisotropic mass distribution and its orientation, especially challenging the common assumption that dark-field signals are describable by a function over the unit sphere. Here, two approximative linear tensor models with reduced orientation dependence are investigated in a simulation study with regard to their applicability to grating based X-ray or neutron dark-field tensor tomography. By systematically simulating and reconstructing a large sample of isolated volume elements covering the full range of feasible anisotropies and orientations, direct correspondences are drawn between the respective tensors characterizing the physically based dark-field model used for signal synthesization and the mathematically motivated simplified models used for reconstruction. The anisotropy of freely rotating volume elements is thereby confirmed to be, for practical reconstruction purposes, approximable both as a function of the optical axis’ orientation or as a function of the interferometer’s grating orientation. The eigenvalues of the surrogate models’ tensors are found to exhibit fuzzy, yet almost linear relations to those of the synthesization model. Dominant orientations are found to be recoverable with a margin of error on the order of magnitude of 1$$^{\circ }$$ ∘ . Although the input data must adequately address the full orientation dependence of dark-field anisotropy, the present results clearly support the general feasibility of quantitative X-ray dark-field tensor tomography within an inherent yet acceptable statistical margin of uncertainty.

Moiré Fringe Analysis of Cradled Panel Paintings

1997 ◽  
Vol 42 (4) ◽  
pp. 211 ◽  
Author(s):  
Al Brewer ◽  
Colin Forno
Keyword(s):  
Fringe Analysis ◽  
Moire Fringe ◽  
Moiré Fringe ◽  
Panel Paintings

Development of the Child's Arch

Foot & Ankle ◽  
1989 ◽  
Vol 9 (5) ◽  
pp. 241-245 ◽  
Author(s):  
Nathaniel Gould ◽  
Morey Moreland ◽  
Richard Alvarez ◽  
Saul Trevino ◽  
James Fenwick
Keyword(s):  
Lower Extremities ◽  
Genu Valgum ◽  
Initial Examination ◽  
Pes Planus ◽  
X Ray ◽  
Longitudinal Arch ◽  
Physical Examinations ◽  
Moire Fringe ◽  
Arch Support ◽  
Moiré Fringe

The purposes of the project were to monitor the development of the lower extremities and the longitudinal arch of the foot and to determine whether or not arch support footwear (three types) affected development of a neutral arch in toddlers 11 to 14 months of age until age 5 years. A total of 125 beginner walkers were recruited through the pediatrics department during a period of 1 ½ years and divided by lot into four different footwear groups (one nonarch supportive). The group was studied for 4 years by physical examinations, x-ray films, and pedotopography (a Moire fringe technique of photography). At initial examination all of the apparently normal toddlers had pes planus by all clinical, roentgenographic, and photographic measurements. There were no cavus feet at that time or at 5 years of age. Arches developed regardless of the footwear worn but development was faster during the first 2 years (until age 3 years) with arch support footwear. The rapidity of arch development until 5 years of age continued in those children who wore longitudinal arch cookies. Ossification of the sustentaculum tali begins at approximately 5 years of age but is not complete for at least another 1 to 2 years. Hyperpronation was present in 77.9% and genu valgum in 92.3% of the 5-year-old children. These conditions are apparently the norm at this age in both boys and girls.

scholarly journals Phase-locked moiré fringe analysis for automated contouring of diffuse surfaces

1979 ◽  
Vol 18 (1) ◽  
pp. 91 ◽  
Author(s):  
Duncan T. Moore ◽  
Bruce E. Truax
Keyword(s):  
Fringe Analysis ◽  
Moire Fringe ◽  
Moiré Fringe

Moiré Fringe Analysis of BaZrO3Nanorods in ErBa2Cu3O7-δFilms

2007 ◽  
Vol 46 (2) ◽  
pp. 708-711 ◽  
Author(s):  
Kazuhiro Yamada ◽  
Ataru Ichinose ◽  
Yoshitsugu Tomokiyo ◽  
Yuki Shingai ◽  
Kaname Matsumoto ◽  
...  
Keyword(s):  
Fringe Analysis ◽  
Moire Fringe ◽  
Moiré Fringe

Moiré fringe analysis of cradled panel paintings

1997 ◽  
Vol 42 (4) ◽  
pp. 211-230 ◽  
Author(s):  
Al Brewer ◽  
Colin Forno
Keyword(s):  
Fringe Analysis ◽  
Moire Fringe ◽  
Moiré Fringe ◽  
Panel Paintings

Fractional moire fringe analysis by optimization

1992 ◽  
Vol 31 (4) ◽  
pp. 838 ◽  
Author(s):  
Itzhak Shapira
Keyword(s):  
Fringe Analysis ◽  
Moire Fringe ◽  
Moiré Fringe
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