Beam hardening effects in grating‐based x‐ray phase‐contrast imaging

Chabior, Michael; Donath, Tilman; Dávid, Christian; Bunk, Oliver; Schuster, M.; Schroer, Christian G.; Pfeiffer, Franz

doi:10.1118/1.3553408

Cited by 57 publications

(57 citation statements)

References 33 publications

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“…The spectrum impinging on these soldering point is hardened by the resistors in the upper layer, resulting in lower absorption contrast. Due to the weaker energy dependence of phase shifts (1/ E compared to 1/ E 3 ), phase-contrast images are less sensitive to beam hardening30, which explains the lower contrast reduction of the soldering points under the resistors in the phase image of the chip. This example shows one of the potential benefits of phase contrast X-ray imaging at high energies, which may be useful to identify flaws in multilayered structures such as electronic chips.…”

Section: Resultsmentioning

confidence: 99%

X-ray phase-contrast imaging at 100 keV on a conventional source

Thüring

Abis

Wang

et al. 2014

Sci Rep

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X-ray grating interferometry is a promising imaging technique sensitive to attenuation, refraction and scattering of the radiation. Applications of this technique in the energy range between 80 and 150 keV pose severe technical challenges, and are still mostly unexplored. Phase-contrast X-ray imaging at such high energies is of relevant scientific and industrial interest, in particular for the investigation of strongly absorbing or thick materials as well as for medical imaging. Here we show the successful implementation of a Talbot-Lau interferometer operated at 100 keV using a conventional X-ray tube and a compact geometry, with a total length of 54 cm. We present the edge-on illumination of the gratings in order to overcome the current fabrication limits. Finally, the curved structures match the beam divergence and allow a large field of view on a short and efficient setup.

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Section: Resultsmentioning

confidence: 99%

X-ray phase-contrast imaging at 100 keV on a conventional source

Thüring

Abis

Wang

et al. 2014

Sci Rep

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show abstract

“…We have also shown, for reference, the theoretical refraction angle at the estimated mean energy of the spectrum (18keV). We do not expect the experimentally acquired results to match this profile due to beam hardening which results from absorption by the wire [25]. The main point of these plots is to show an experimental case where the full TC inversion formula is required for accuracy in order to account for large refraction angles.…”

Section: Examples and Analysismentioning

confidence: 98%

“…The expected refraction angle in Fig. 9 can only be calculated with accurate knowledge of the source and detector spectral responses and the sample absorption [25]. In light of this and in order to further demonstrate the advantages of the TC inversion method we now present some numerical simulations.…”

Section: Examples and Analysismentioning

confidence: 99%

“…When a polychromatic source is employed, the concept of phase is ambiguous since it implies an averaging of phase. Furthermore, any such measured phase will depend on the source, aperture, detector and sample spectral properties [25]. Figure 11(a) shows the calculated TC for the polychromatic case for aperture gold thicknesses of 10, 20, 40 and 80μm respectively.…”

Section: Examples and Analysismentioning

confidence: 99%

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A simplified approach to quantitative coded aperture X-ray phase imaging

et al. 2013

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Abstract:We recently demonstrated how quantitative X-ray phase contrast imaging may be performed with laboratory sources using the coded aperture technique. This technique required the knowledge of system parameters such as, for example, the source focal spot size and distances between elements of the imaging system. The method also assumes that the absorbing regions of the apertures are perfectly absorbing. In this paper we demonstrate how quantitative imaging can be performed without knowledge of individual system parameters and with partially absorbing apertures. We also show that this method is analogous to that employed in analyser based imaging which uses the rocking curve of an analyser crystal.

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“…It must be noted that beam-hardening artifacts might affect the quality of the CT reconstruction, especially for large and/or dense samples, similar to conventional absorption-based CT [28]; therefore, adaptation to XPCI of the correction methods developed for conventional CT might be necessary to correct for these effects.…”

Section: Theorymentioning

confidence: 99%

Single-Shot X-Ray Phase-Contrast Computed Tomography with Nonmicrofocal Laboratory Sources

Diémoz¹,

Hagen²,

Endrizzi³

et al. 2017

Phys. Rev. Applied

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We present a method that enables performing x-ray phase-contrast imaging (XPCI) computed tomography with a laboratory setup using a single image per projection angle, eliminating the need to move optical elements during acquisition. Theoretical derivation of the method is presented, and its validity conditions are provided. The object is assumed to be quasihomogeneous, i.e., to feature a ratio between the refractive index and the linear attenuation coefficient that is approximately constant across the field of view. The method is experimentally demonstrated on a plastics phantom and on biological samples using a continuous rotation acquisition scheme achieving scan times of a few minutes. Moreover, we show that such acquisition times can be further reduced with the use of a high-efficiency photon-counting detector. Thanks to its ability to substantially simplify the image-acquisition procedure and greatly reduce collection times, we believe this method represents a very important step towards the application of XPCI to real-world problems.

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Beam hardening effects in grating‐based x‐ray phase‐contrast imaging

Abstract: The evaluated correction algorithm is shown to yield good results for a number of simple test objects and can thus be advocated in medical imaging and nondestructive testing.

Cited by 57 publications

References 33 publications

X-ray phase-contrast imaging at 100 keV on a conventional source

X-ray phase-contrast imaging at 100 keV on a conventional source

A simplified approach to quantitative coded aperture X-ray phase imaging

Single-Shot X-Ray Phase-Contrast Computed Tomography with Nonmicrofocal Laboratory Sources

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