MOGNO, the nano and microtomography beamline at Sirius, the Brazilian synchrotron light source

Archilha, Nathaly L.; Costa, GS R; Ferreira, G R B; Moreno, Gabriel; Rocha, A S; Meyer, Bernd; Pinto, A C; Miqueles, Eduardo X.; Cardoso, Mateus Borba; Westfahl, Harry

doi:10.1088/1742-6596/2380/1/012123

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…SXRCT was conducted at the MOGNO beamline of the Brazilian synchrotron light source (Sirius) (Archilha et al., 2022). Projection data were acquired under quasi‐monochromatic beam conditions (22 ± 1.4 keV), enabled by a set of multilayer mirrors, with a 0.5 μm Si filter to eliminate photon energies <10 keV.…”

Section: Methodsmentioning

confidence: 99%

A high‐throughput analysis of high‐resolution X‐ray CT images of stems of olive and citrus plants resistant and susceptible to Xylella fastidiosa

Walker,

Ruiz,

Ferreira

et al. 2023

Plant Pathology

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The bacterial plant pathogen Xylella fastidiosa causes disease in several globally important crops. However, some cultivars harbour reduced bacterial loads and express few symptoms. Evidence considering plant species in isolation suggests xylem structure influences cultivar susceptibility to X. fastidiosa. We test this theory more broadly by analysing high‐resolution synchrotron X‐ray computed tomography of healthy and infected plant vasculature from two taxonomic groups containing susceptible and resistant varieties: two citrus cultivars (sweet orange cv. Pera, tangor cv. Murcott) and two olive cultivars (Koroneiki, Leccino). Results found the susceptible plants had more vessels than resistant ones, which could promote within‐host pathogen spread. However, features associated with resistance were not shared by citrus and olive. While xylem vessels in resistant citrus stems had comparable diameters to those in susceptible plants, resistant olives had narrower vessels that could limit biofilm spread. And while differences among olive cultivars were not detected, results suggest greater vascular connectivity in resistant compared to susceptible citrus plants. We hypothesize that this provides alternate flow paths for sustaining hydraulic functionality under infection. In summary, this work elucidates different physiological resistance mechanisms between two taxonomic groups, while supporting the existence of an intertaxonomical metric that could speed up the identification of candidate‐resistant plants.

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Section: Methodsmentioning

confidence: 99%

A high‐throughput analysis of high‐resolution X‐ray CT images of stems of olive and citrus plants resistant and susceptible to Xylella fastidiosa

Walker,

Ruiz,

Ferreira

et al. 2023

Plant Pathology

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“…Radial increments from the center of a 2.9 mm diameter cylinder soil (mm) 0 -0.29 0.29 -0.58 0.58 -0.87 0.87 -1. 16 Absorbed dose rate (kGy/s/mA) 0° ↔ 180°4.9 ± 0.5 5.0 ± 0.5 5.2 ± 0.5 5.5 ± 0.6 45° → 225°4.9 ± 0.5 4.8 ± 0.5 4.7 ± 0.5 4.9 ± 0.5 90° → 270°4.8 ± 0.5 4.6 ± 0.5 4.5 ± 0.4 4.4 ± 0.4 225° → 45°5.2 ± 0.5 5.5 ± 0.6 6.0 ± 0.6 6.7 ± 0.7 270° → 90°5.3 ± 0.5 5.7 ± 0.6 6.2 ± 0. www.nature.com/scientificreports/ root is opposite the incoming beam. This angular dependence of dose rate varied by fivefold for the X-ray beam filtered through 0.36 mm of Si, which had a radiation profile skewed toward lower-energies (Fig.…”

Section: Rotation Angle*mentioning

confidence: 99%

Monte Carlo simulations of synchrotron X-ray dose affecting root growth during in vivo tomographic imaging

Moraes

Hesterberg

Neto

et al. 2023

Sci Rep

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Synchrotron X-ray computed tomography (XCT) has been increasingly applied to study the in vivo dynamics of root growth and rhizosphere processes. However, minimizing radiation-induced damage to root growth warrants further investigation. Our objective was to develop a robust approach for modeling and evaluating ways to reduce synchrotron X-ray dose effects on root growth during in vivo imaging. Wheat roots growing in soil were exposed to X-rays during XCT experiments resolved in space (3D) plus time (4D). The dose rate and cumulative absorbed dose in roots were modelled using the Monte Carlo code FLUKA for different experimental conditions of polychromatic and quasi-monochromatic X-ray beam configurations. The most impactful factors affecting damage to roots were incident X-ray energy spectrum, stored current in the accelerator machine, position of the root in the soil, and possibly the number of exposures during the 4D XCT experiments. Our results imply that radiation dose during in vivo imaging of plant roots can be diminished by using monochromatic radiation at the highest energy suitable for a given sample thickness and field of view, and by controlling the rotation axis of off-centered roots to increase attenuation of radiation by the soil matrix.

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“…It was required to push the boundaries of detector technology toward sensors capable of counting photons at higher rates and in a broader energy range. For that reason, materials with high atomic numbers Z, such as Gallium Arsenide (GaAs) [6], Cadmium Telluride (CdTe) [7,8], and Cadmium Zinc Telluride (CdZnTe) [9] were introduced to provide those features and enhance the experiment capabilities [10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Hybrid Pixel Detector With CdTe Sensor

Rosa¹,

Mendes²,

Oliveira³

et al. 2023

Proceedings of 10th International Workshop on Semiconductor Pixel Detectors for Particles and Imaging — PoS(Pixel2022)

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The X-ray techniques used in synchrotron sources have been an indispensable tool in studying the physical aspects of various fields, such as biology, chemistry, and materials science. The results of these experiments often depend on the performance of the detectors, especially when studying sample dynamics, which require fast and sensitive X-ray detectors. This work presents a description of the PIMEGA X-ray camera system based on 1 mm thick CdTe sensors with a 55 μm pixel pitch bump-bonded to Medipix3RX ASICs. It is also described the preliminary results of the system's prototype characterization and imaging capabilities, which were conducted in terms of spatial resolution, detective quantum efficiency, leakage current, full depletion, and equalization responses. The experiments were performed using the detector in super high gain mode, with a 12-bit configuration in Fine Pitch and Single-Pixel mode. The results show the high-quality imaging capabilities of the detector with excellent values of MTF and DQE.

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MOGNO, the nano and microtomography beamline at Sirius, the Brazilian synchrotron light source

Cited by 7 publications

References 4 publications

A high‐throughput analysis of high‐resolution X‐ray CT images of stems of olive and citrus plants resistant and susceptible to Xylella fastidiosa

A high‐throughput analysis of high‐resolution X‐ray CT images of stems of olive and citrus plants resistant and susceptible to Xylella fastidiosa

Monte Carlo simulations of synchrotron X-ray dose affecting root growth during in vivo tomographic imaging

Characterization of Hybrid Pixel Detector With CdTe Sensor

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