Virtual subpixel approach for single-mask phase-contrast imaging using Timepix3

Abstract

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Single-shot, omni-directional x-ray scattering imaging with a laboratory source and single-photon localization

“…The use of the virtual subpixels for BT is described in details in Ref. [21], where it was used for directional DPC imaging. The absorption mask is aligned such that the beamlets hit in the corners between pixels to increase the photon localization precision [21], making our setup similar to the single-mask edge-illumination technique [22].…”

“…The size at the detector means that the beamlets can be sufficiently resolved using a rebinning of 2 × 2 virtual pixels per physical pixel. 2 × 2 virtual pixels has been shown to be the most accurate rebinning for DPC retrieval [21].…”

“…The omni-directional DPC is found by the method presented in Ref. [21]. To optimize the image contrast of the thin butterfly (thickest part is ∼ 2 mm), the Timepix3's spectral sensitivity was used to include only photons around the tungsten L α emission line (E γ ∈ [5, 12.2] keV).…”

Laser ablation of high-aspect-ratio hole arrays in tungsten for X-ray applications

“…A series of samples were imaged using a single mask phase contrast imaging setup, as illustrated in Fig. 1 and described in [20] using a tungsten X-ray source operating at 50 kV. The technique uses the single absorption tungsten mask to cut the X-ray beam into multiple beam-lets (micron size X-ray beams).…”

“…The beam-lets intensity distribution is analyzed at the X-ray detector, by using single photon counting techniques described in ref. [20]. An example of an imaged moth is shown in Fig.…”