Edge-subtraction X-ray ptychographic imaging with pink beam synchrotron radiation and a single photon-counting detector

Brun, Francesco; Trapani, Vittorio Di; Batey, Darren; Cipiccia, Silvia; Rau, Christoph

doi:10.1038/s41598-020-63161-x

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…The beamline is equipped with a triple-stripe mirror (Si, Pt, Ro), a metal filter box and a Si(111) double-crystal monochromator (DCM). The beamline can be operated either in monochromatic or pink beam mode by removing the DCM from the X-ray path (Batey et al, 2019;Brun, Di Trapani, Batey et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

“…In two-colours mode, Pixirad outputs two images in a single acquisition: one collects events with energy between thr 1 and thr 2 , the second collects events with energy above thr 2 . The detector has proved its effectiveness for single-shot K-edge subtraction computed tomography (KES-CT) with polychromatic laboratory sources (Brun, Di Trapani, Albers et al, 2020) and has been recently used as a harmonic selector for edge subtraction ptychographic imaging using synchrotron X-ray pink beam (Brun, Di Trapani, Batey et al, 2020).…”

Section: Pixirad Detectormentioning

confidence: 99%

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Dual energy X-ray beam ptycho-fluorescence imaging

Cipiccia

Brun

Trapani

et al. 2021

J Synchrotron Radiat

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X-ray ptychography and X-ray fluorescence are complementary nanoscale imaging techniques, providing structural and elemental information, respectively. Both methods acquire data by scanning a localized beam across the sample. X-ray ptychography processes the transmission signal of a coherent illumination interacting with the sample, to produce images with a resolution finer than the illumination spot and step size. By enlarging both the spot and the step size, the technique can cover extended regions efficiently. X-ray fluorescence records the emitted spectra as the sample is scanned through the localized beam and its spatial resolution is limited by the spot and step size. The requisites for fast ptychography and high-resolution fluorescence appear incompatible. Here, a novel scheme that mitigates the difference in requirements is proposed. The method makes use of two probes of different sizes at the sample, generated by using two different energies for the probes and chromatic focusing optics. The different probe sizes allow to reduce the number of acquisition steps for the joint fluorescence–ptychography scan compared with a standard single beam scan, while imaging the same field of view. The new method is demonstrated experimentally using two undulator harmonics, a Fresnel zone plate and an energy discriminating photon counting detector.

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Section: Methodsmentioning

confidence: 99%

Section: Pixirad Detectormentioning

confidence: 99%

Dual energy X-ray beam ptycho-fluorescence imaging

Cipiccia

Brun

Trapani

et al. 2021

J Synchrotron Radiat

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“…As a result, these detectors can distinguish between X-ray photons in lower flux and background photons, achieving outstanding signal-tonoise relations. These features are particularly interesting for synchrotron applications, such as diffractometry [2], ptychography [3], and X-ray tomography [4].…”

Section: Introductionmentioning

confidence: 99%

Large area hybrid detectors based on Medipix3RX: commissioning and characterization at Sirius beamlines

et al. 2023

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Hybrid pixel detectors are inherently modular and typically operate at relative low noise levels, while providing high spatial resolution, easing the assembling of large area detectors. This report summarizes the procedures and results regarding the characterization studies performed on the Medipix3RX ASIC based detector, known as PIMEGA, which was developed and is deployed at Sirius synchrotron facility at the Brazilian Synchrotron Light Laboratory. They consist of modular constructions that reach up to 170 × 170 mm2 of active area, with 300 µm thick silicon sensors, and pixel size of 55 × 55 µm2. We investigated the spatial and energy resolutions, structural noise properties, and count-rate linearity up to large fluxes from the synchrotron beamlines. The Modulation Transfer Function presents a considerably slow decay rate as a function of the spatial frequency, reaching 30% at 10.5 lp/mm, for an operation with a threshold setting equivalent to half of the incident energy. We have also found that the energy resolutions of the two highest gain modes are around 15% for 17.5 keV incident photons. In particular, we have found that, for a noise-suppressing set of configurations, the detector presents a dead time of 460 ± 10 ns. Additionally, the pile-up effect leads to a 10% loss of linearity at input fluxes of 2.3 × 105 photons/pixel.s. These results open the possibility for operating these devices with in-depth knowledge of their performance, allowing various scientific experiments, such as X-ray diffraction, computed controlled tomography, and ptychography.

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Pre- and post-reconstruction digital image processing solutions for computed tomography with spectral photon counting detectors

Trapani¹,

Brun²

2021

Nuclear Instruments and Methods in Physics Research Section A:

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Edge-subtraction X-ray ptychographic imaging with pink beam synchrotron radiation and a single photon-counting detector

Cited by 5 publications

References 29 publications

Dual energy X-ray beam ptycho-fluorescence imaging

Dual energy X-ray beam ptycho-fluorescence imaging

Large area hybrid detectors based on Medipix3RX: commissioning and characterization at Sirius beamlines

Pre- and post-reconstruction digital image processing solutions for computed tomography with spectral photon counting detectors

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