Augmenting a conventional x-ray scanner with edge illumination-based phase contrast imaging: how to design the gratings

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

doi:10.1117/12.2633455

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…The EI-XPCI setup was modeled after the FleXCT, a flexible XCT-scanner available at imec-Vision Lab. Absorbing masks were specifically designed for this imaging setup [41]. Without loss of generalization, only a small part of the detector (30 × 30 pixels) was modeled to limit the computation time of the simulations.…”

Section: Methodsmentioning

confidence: 99%

Fiber Orientation Estimation from X-ray Dark Field Images of Fiber Reinforced Polymers Using Constrained Spherical Deconvolution

et al. 2023

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The properties of fiber reinforced polymers are strongly related to the length and orientation of the fibers within the polymer matrix, the latter of which can be studied using X-ray computed tomography (XCT). Unfortunately, resolving individual fibers is challenging because they are small compared to the XCT voxel resolution and because of the low attenuation contrast between the fibers and the surrounding resin. To alleviate both problems, anisotropic dark field tomography via grating based interferometry (GBI) has been proposed. Here, the fiber orientations are extracted by applying a Funk-Radon transform (FRT) to the local scatter function. However, the FRT suffers from a low angular resolution, which complicates estimating fiber orientations for small fiber crossing angles. We propose constrained spherical deconvolution (CSD) as an alternative to the FRT to resolve fiber orientations. Instead of GBI, edge illumination phase contrast imaging is used because estimating fiber orientations with this technique has not yet been explored. Dark field images are generated by a Monte Carlo simulation framework. It is shown that the FRT cannot estimate the fiber orientation accurately for crossing angles smaller than 70∘, while CSD performs well down to a crossing angle of 50∘. In general, CSD outperforms the FRT in estimating fiber orientations.

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Section: Methodsmentioning

confidence: 99%

Fiber Orientation Estimation from X-ray Dark Field Images of Fiber Reinforced Polymers Using Constrained Spherical Deconvolution

et al. 2023

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“…For the masks to be compatible with the FleXCT scanner, they must be designed with a certain pitch, aperture width and thickness. The optimal values for these parameters were determined in [10] and the specifications of both masks are listed in Table 1.…”

Section: Adaptation Of the Xct-scannermentioning

confidence: 99%

Adapting an XCT-scanner to enable edge illumination X-ray phase contrast imaging

Huyge¹,

Vanthienen²,

Six³

et al. 2023

eJNDT

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Conventional X-ray computed tomography (XCT) is a non-destructive imaging technique to visualize and inspect the internal structure of materials in 3D, where materials are distinguished solely on the basis of their attenuation coefficient. However, with more specialized X-ray phase contrast imaging methods, sensitivity to complementary contrasts can be achieved, namely phase contrast and dark field contrast. Edge illumination X-ray phase contrast imaging (EI-XPCI) is a technique that is especially suited for laboratory application, because it has no strict coherence requirements for the source. While there is a wide variety of XCTscanners available on the market, a commercial EI-XPCI scanner does not yet exist. In this work, we present the procedure of outfitting an existing XCT-scanner with components to enable EI-XPCI scans and discuss the alignment procedure of these added components. Finally, phase contrast images are shown demonstrating the successful upgrade of a conventional XCT system with edge illumination based phase contrast possibilities.

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“…In Fig. 1.18 the edge illumination setup installed at the FleXCT system at the University of Antwerp is shown [3,72]. When an image is acquired using the setup shown in Fig.…”

Section: Edge Illumination Setupmentioning

confidence: 99%

Improved X-ray CT reconstruction techniques with non-linear imaging models

Six

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Augmenting a conventional x-ray scanner with edge illumination-based phase contrast imaging: how to design the gratings

Cited by 5 publications

References 13 publications

Fiber Orientation Estimation from X-ray Dark Field Images of Fiber Reinforced Polymers Using Constrained Spherical Deconvolution

Fiber Orientation Estimation from X-ray Dark Field Images of Fiber Reinforced Polymers Using Constrained Spherical Deconvolution

Adapting an XCT-scanner to enable edge illumination X-ray phase contrast imaging

Improved X-ray CT reconstruction techniques with non-linear imaging models

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