X-ray phase contrast simulation for grating-based interferometry using GATE

Sanctorum, Jonathan; Beenhouwer, Jan De; Sijbers, Jan

doi:10.1364/oe.392337

Cited by 26 publications

(21 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous MC approaches to the simulation of phase sensitive X-ray imaging setups include combinations of MC with wave propagators 21 – 23 , MC that imitate the Huygens-Fresnel principle 24 – 27 , and pure ray-tracing algorithms 28 , 29 . However, the algorithms applicable to GI either suffer from long computation times unfeasible for clinical prototype simulations or consist of a combination of more than one simulation technique, which is physically unsatisfactory.…”

Section: Introductionmentioning

confidence: 99%

Semi-classical Monte Carlo algorithm for the simulation of X-ray grating interferometry

Tessarini

Fix

Manser

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Traditional simulation techniques such as wave optics methods and Monte Carlo (MC) particle transport cannot model both interference and inelastic scattering phenomena within one framework. Based on the rules of quantum mechanics to calculate probabilities, we propose a new semi-classical MC algorithm for efficient and simultaneous modeling of scattering and interference processes. The similarities to MC particle transport allow the implementation as a flexible c++ object oriented extension of EGSnrc—a well-established MC toolkit. In addition to previously proposed Huygens principle based transport through optics components, new variance reduction techniques for the transport through gratings are presented as transport options to achieve the required improvement in speed and memory costs necessary for an efficient exploration (system design—dose estimations) of the medical implementation of X-ray grating interferometry (GI), an emerging imaging technique currently subject of tremendous efforts towards clinical translation. The feasibility of simulation of interference effects is confirmed in four academic cases and an experimental table-top GI setup. Comparison with conventional MC transport show that deposited energy features of EGSnrc are conserved.

show abstract

Section: Introductionmentioning

confidence: 99%

Semi-classical Monte Carlo algorithm for the simulation of X-ray grating interferometry

Tessarini

Fix

Manser

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Some Monte Carlo based methods for modelling the X-ray interactions with the material (e.g. refraction and scattering) have been implemented in Gate 18 and in Geant-4 19 . In this work, we focused on phase contrast (Fresnel diffraction), therefore, a method proposed by Langer et al 20 using a ray casting procedure to obtain integral of the refractive index, as well as an analytical wave optics approach for generating Fresnel diffraction patterns is used to simulate phase contrast tomography.…”

Section: Introductionmentioning

confidence: 99%

Characterization of internal fatigue cracks in aluminum alloys by simulation of phase contrast tomography

Xiao

Létang

Buffière

2022

Sci Rep

View full text Add to dashboard Cite

Synchrotron Radiation Computed Tomography (SRCT) allows a better detection of fatigue cracks in metals than laboratory CT due to the existence of phase contrast. However the presence in reconstructed images of fringes at the edges of objects generated by Fresnel diffraction makes it difficult to identify and analyze the cracks quantitatively. Simulations of phase contrast synchrotron tomography images containing cracks with different sizes and shapes are obtained by using GATE software. Analyzing the simulation results, firstly, we confirmed that the bright parts with strong contrast in SRCT image are streak artifacts; secondly, we found that the gray scale values within the cracks in SRCT images are related to the crack size; these simulation results are used to analyse SRCT images of internal fatigue cracks in a cast Al alloy, providing a clearer visualisation of damage.

show abstract

“…It is also worth noting that the simulation of grating-based interferometry for phase contrast is compatible with the Fresnel propagator method, since it is based on the computation of the complex wavefront. The MC and raytracing methods however would not be able to simulate the Talbot intensity patterns unless a dedicated wavefront construction is implemented, as for example in the study of Sanctorum et al, 2020. The most likely cause of the obvious discrepancies between the measured profiles and the simulated ones comes from the lack of a realistic surface modeling. All three simulations considered perfectly smooth cylinders for the Nylon fibers.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of simulators for x-ray speckle-based phase contrast imaging

Quénot¹,

Brun²,

Létang³

et al. 2021

Phys. Med. Biol.

View full text Add to dashboard Cite

X-ray phase contrast imaging (PCI) denotes a group of highly sensitive imaging techniques that permits imaging at scales ranging from nanoscopic to the medical. Recently introduced, speckle-based imaging has seen a rapid development because of its experimental simplicity and its capability to retrieve the refraction, the scattering and the absorption of a sample using a conventional X-ray set-up. Precise simulation would permit to optimise the imaging setups for different applications, but until now works on simulation of X-ray speckle-based phase contrast imaging have been very few. In this work we evaluate different simulation codes, based on Monte-Carlo, analytical ray-tracing and wave-optics Fresnel propagation. The simulation results are compared to both synchrotron and conventional imaging experiments to permits their validation. We obtain a strong similarity between simulated and experimental data. We discuss the validity and applicability of each approach.

show abstract

X-ray phase contrast simulation for grating-based interferometry using GATE

Cited by 26 publications

References 33 publications

Semi-classical Monte Carlo algorithm for the simulation of X-ray grating interferometry

Semi-classical Monte Carlo algorithm for the simulation of X-ray grating interferometry

Characterization of internal fatigue cracks in aluminum alloys by simulation of phase contrast tomography

Evaluation of simulators for x-ray speckle-based phase contrast imaging

Contact Info

Product

Resources

About