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Seret A, Gao W, Juul Jensen D, Godfrey A, Zhang Y. Indexing of superimposed Laue diffraction patterns using a dictionary-branch-bound approach. J Appl Crystallogr 2022; 55:1085-1096. [PMID: 36249500 PMCID: PMC9533744 DOI: 10.1107/s1600576722006021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 06/06/2022] [Indexed: 11/10/2022] Open
Abstract
X-ray Laue diffraction is an important method for characterizing the local crystallographic orientation and elastic strain in polycrystalline materials. Existing analysis methods are designed mainly to index a single or a few Laue diffraction pattern(s) recorded in a detector image. In this work, a novel method called dictionary-branch-bound (DBB) is presented to determine the crystallographic orientations of multiple crystals simultaneously illuminated by a parallel X-ray incident beam, using only the spot positions in a detector image. DBB is validated for simulated X-ray Laue diffraction data. In the simulation, up to 100 crystals with random crystallographic orientations are simultaneously illuminated. Fake spots are randomly added to the detector image to test the robustness of DBB. Additionally, spots are randomly removed to test the resilience of DBB against true spots that are undetected due to background noise and/or spot overlap. Poisson noise is also added to test the sensitivity of DBB to less accurate positions of detected spots. In all cases except the most challenging one, a perfect indexing with a mean angular error below 0.08° is obtained. To demonstrate the potential of DBB further, it is applied to synchrotron microdiffraction data. Finally, guidelines for using DBB in experimental data are provided.
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Affiliation(s)
- Anthony Seret
- Department of Civil and Mechanical Engineering, Technical University of Denmark, Kongens Lyngby, 2800, Denmark
| | - Wenqiang Gao
- Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China
| | - Dorte Juul Jensen
- Department of Civil and Mechanical Engineering, Technical University of Denmark, Kongens Lyngby, 2800, Denmark
| | - Andy Godfrey
- Key Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China
| | - Yubin Zhang
- Department of Civil and Mechanical Engineering, Technical University of Denmark, Kongens Lyngby, 2800, Denmark
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Jiang Y, Qin H, Wan H, Yang J, Yu Q, Jiang M, Yu B. Asprin-loaded strontium-containing α-calcium sulphate hemihydrate/nano-hydroxyapatite composite promotes regeneration of critical bone defects. J Cell Mol Med 2020; 24:13690-13702. [PMID: 33159499 PMCID: PMC7754043 DOI: 10.1111/jcmm.15918] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Revised: 08/01/2020] [Accepted: 09/08/2020] [Indexed: 12/20/2022] Open
Abstract
Our laboratory originally synthesized strontium(Sr)‐containing α‐calcium sulphate hemihydrate/nano‐hydroxyapatite composite (Sr‐α‐CSH/n‐HA) and demonstrated its ability to repair critical bone defects. This study attempted to incorporate aspirin into it to produce a better bone graft material for critical bone defects. After 5% Sr‐α‐CSH was prepared by coprecipitation and hydrothermal methods, it was mixed with aspirin solution of different concentrations (50 μg/ml, 200 μg/ml, 800 μg/ml and 3200 μg/ml) at a fixed liquid‐solid ratio (0.54 v/w) to obtain aspirin‐loaded Sr‐α‐CSH/n‐HA composite. In vitro experiments were performed on the composite extracts. The tibial defects (3 mm*5 mm) in SD rat model were filled with the composite for 4 weeks and 12 weeks to evaluate its osteogenic capacity in vivo. Our results showed its capability of proliferation, migration and osteogenesis of BMSCs in vitro got improved. In vivo treatment with 800 μg/ml aspirin–loaded Sr‐α‐CSH/n‐HA composite led to significantly more new bone formation in the defects compared with Sr‐α‐CSH/n‐HA composite and significantly promoted the expression of osteogenic‐related genes and inhibited osteoclast activity. In general, our research suggests that aspirin‐loaded Sr‐α‐CSH/n‐HA composite may have a greater capacity of repairing tibial defects in SD rats than simple Sr‐α‐CSH/n‐HA composite.
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Affiliation(s)
- Yi Jiang
- Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Key Laboratory of Bone and Cartilage Regeneration Medicine, Southern Medical University, Guangzhou, Guangdong, China.,Department of Orthopaedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Hanjun Qin
- Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Key Laboratory of Bone and Cartilage Regeneration Medicine, Southern Medical University, Guangzhou, Guangdong, China
| | - Haoyang Wan
- Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Key Laboratory of Bone and Cartilage Regeneration Medicine, Southern Medical University, Guangzhou, Guangdong, China
| | - Jun Yang
- Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Key Laboratory of Bone and Cartilage Regeneration Medicine, Southern Medical University, Guangzhou, Guangdong, China
| | - Qi Yu
- Department of Orthopaedics, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, China
| | - Mo Jiang
- Department of Orthopaedics, Affiliated Hospital of Jiangxi University of Traditional Chinese Medicine, Yingtan, Jiangxi, China
| | - Bin Yu
- Department of Orthopaedics, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China.,Key Laboratory of Bone and Cartilage Regeneration Medicine, Southern Medical University, Guangzhou, Guangdong, China
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Arnaud A, Guediche W, Remacha C, Romero E, Proudhon H. A laboratory transmission diffraction Laue setup to evaluate single-crystal quality. J Appl Crystallogr 2020. [DOI: 10.1107/s1600576720006317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
A scanning laboratory Laue transmission setup is developed to probe extended quasi-monocrystalline samples. Orientation mapping is achieved by controlling the collimation of the incident beam and scanning the position of the specimen. An automated indexing algorithm for transmission Laue patterns is presented, together with a forward simulation model adapted for a laboratory setup. The effect of the main parameters of the system is studied with the aim of achieving exposure times of the order of one second. Applications are presented to probe the orientation of an extended part and detect disoriented regions within the bulk. Finally, the analysis of diffraction spot shapes shows that the misorientation within the illuminated volume can be measured, and a new method is proposed to evaluate its complete mean lattice rotation tensor.
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Shokr M, Tosson A, Abboud A, Algashi A, Schlosser D, Hartmann R, Klaus M, Genzel C, Strüder L, Pietsch U. Energy-dispersive Laue diffraction by means of a pnCCD detector coupled to a CsI(Tl) scintillator using ultra-hard X-ray synchrotron radiation. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:1612-1620. [PMID: 31490151 DOI: 10.1107/s160057751900626x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 05/03/2019] [Indexed: 06/10/2023]
Abstract
The lattice parameters and unit-cell orientation of an SrLaAlO4 crystal have been determined by means of energy-dispersive X-ray Laue diffraction (EDLD) using a pnCCD detector coupled to a columnar structure CsI(Tl) scintillator in the energy range between 40 and 130 keV. By exploiting the high quantum efficiency (QE) achieved by this combined detection system for hard X-rays, a large number of Bragg reflections could be recorded by the relatively small detector area, allowing accurate and fast determination of the lattice parameters and the moduli of the structure factors. The experiment was performed on the energy-dispersive diffraction (EDDI) beamline at the BESSY II synchrotron using a pnCCD detector with 128 × 128 pixels. Since the energies and positions of the Laue peaks can be recorded simultaneously by the pnCCD system, the tetragonal structure of the investigated specimen was determined without any prior information. The unit-cell parameters and the angles between the lattice vectors were evaluated with an accuracy of better than 0.7%, while the structure-factor moduli of the reflections were determined with a mean deviation of 2.5% relative to the theoretical values.
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Affiliation(s)
- Mohammad Shokr
- Universität Siegen, Walter-Flex Strasse 3, 57062 Siegen, Germany
| | - Amir Tosson
- Universität Siegen, Walter-Flex Strasse 3, 57062 Siegen, Germany
| | - Ali Abboud
- Universität Siegen, Walter-Flex Strasse 3, 57062 Siegen, Germany
| | - Alaa Algashi
- Universität Siegen, Walter-Flex Strasse 3, 57062 Siegen, Germany
| | | | | | - Manuela Klaus
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein Strasse 15, 12489 Berlin, Germany
| | - Christoph Genzel
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein Strasse 15, 12489 Berlin, Germany
| | - Lothar Strüder
- Universität Siegen, Walter-Flex Strasse 3, 57062 Siegen, Germany
| | - Ullrich Pietsch
- Universität Siegen, Walter-Flex Strasse 3, 57062 Siegen, Germany
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Bachmann F, Bale H, Gueninchault N, Holzner C, Lauridsen EM. 3D grain reconstruction from laboratory diffraction contrast tomography. J Appl Crystallogr 2019; 52:643-651. [PMID: 31236094 PMCID: PMC6557177 DOI: 10.1107/s1600576719005442] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 04/21/2019] [Indexed: 11/21/2022] Open
Abstract
A novel reconstruction method to retrieve grain structure from laboratory diffraction contrast tomography is presented and evaluated. A method for reconstructing the three-dimensional grain structure from data collected with a recently introduced laboratory-based X-ray diffraction contrast tomography system is presented. Diffraction contrast patterns are recorded in Laue-focusing geometry. The diffraction geometry exposes shape information within recorded diffraction spots. In order to yield the three-dimensional crystallographic microstructure, diffraction spots are extracted and fed into a reconstruction scheme. The scheme successively traverses and refines solution space until a reasonable reconstruction is reached. This unique reconstruction approach produces results efficiently and fast for well suited samples.
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Affiliation(s)
- Florian Bachmann
- Xnovo Technology ApS, Theilgaards Alle 9, 1th., Køoge, 4600, Denmark
| | - Hrishikesh Bale
- Carl Zeiss X-ray Microscopy, 4385 Hopyard Road, Pleasanton, CA 94588, USA
| | | | - Christian Holzner
- Xnovo Technology ApS, Theilgaards Alle 9, 1th., Køoge, 4600, Denmark.,Carl Zeiss X-ray Microscopy, 4385 Hopyard Road, Pleasanton, CA 94588, USA
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Send S, Abboud A, Wiesner N, Shokr M, Klaus M, Genzel C, Conka-Nurdan T, Schlosser D, Huth M, Hartmann R, Strüder L, Pietsch U. Application of a pnCCD for energy-dispersive Laue diffraction with ultra-hard X-rays. J Appl Crystallogr 2016. [DOI: 10.1107/s1600576715023997] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
In this work the spectroscopic performance of a pnCCD detector in the ultra-hard energy range between 40 and 140 keV is tested by means of an energy-dispersive Laue diffraction experiment on a GaAs crystal. About 100 Bragg peaks were collected in a single-shot exposure of the arbitrarily oriented sample to white synchrotron radiation provided by a wiggler at BESSY II and resolved in a large reciprocal-space volume. The positions and energies of individual Laue spots could be determined with a spatial accuracy of less than one pixel and a relative energy resolution better than 1%. In this way the unit-cell parameters of GaAs were extracted with an accuracy of 0.5%, allowing for a complete indexing of the recorded Laue pattern. Despite the low quantum efficiency of the pnCCD (below 7%), experimental structure factors could be obtained from the three-dimensional data sets, taking into account photoelectric absorption as well as Compton scattering processes inside the detector. The agreement between measured and theoretical kinematical structure factors calculated from the known crystal structure is of the order of 10%. The results of this experiment demonstrate the potential of pnCCD detectors for applications in X-ray structure analysis using the complete energy spectrum of synchrotron radiation.
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