1
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Precise phase retrieval for propagation-based images using discrete mathematics. Sci Rep 2022; 12:18469. [PMID: 36323686 PMCID: PMC9630448 DOI: 10.1038/s41598-022-19940-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 09/06/2022] [Indexed: 11/17/2022] Open
Abstract
The ill-posed problem of phase retrieval in optics, using one or more intensity measurements, has a multitude of applications using electromagnetic or matter waves. Many phase retrieval algorithms are computed on pixel arrays using discrete Fourier transforms due to their high computational efficiency. However, the mathematics underpinning these algorithms is typically formulated using continuous mathematics, which can result in a loss of spatial resolution in the reconstructed images. Herein we investigate how phase retrieval algorithms for propagation-based phase-contrast X-ray imaging can be rederived using discrete mathematics and result in more precise retrieval for single- and multi-material objects and for spectral image decomposition. We validate this theory through experimental measurements of spatial resolution using computed tomography (CT) reconstructions of plastic phantoms and biological tissues, using detectors with a range of imaging system point spread functions (PSFs). We demonstrate that if the PSF substantially suppresses high spatial frequencies, the potential improvement from utilising the discrete derivation is limited. However, with detectors characterised by a single pixel PSF (e.g. direct, photon-counting X-ray detectors), a significant improvement in spatial resolution can be obtained, demonstrated here at up to 17%.
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2
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Zhang L, Zhao H, Zhou Z, Jia M, Zhang L, Jiang J, Gao F. Improving spatial resolution with an edge-enhancement model for low-dose propagation-based X-ray phase-contrast computed tomography. OPTICS EXPRESS 2021; 29:37399-37417. [PMID: 34808812 DOI: 10.1364/oe.440664] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 10/14/2021] [Indexed: 06/13/2023]
Abstract
Propagation-based X-ray phase-contrast computed tomography (PB-PCCT) has been increasingly popular for distinguishing low contrast tissues. Phase retrieval is an important step to quantitatively obtain the phase information before the tomographic reconstructions, while typical phase retrieval methods in PB-PCCT, such as homogenous transport of intensity equation (TIE-Hom), are essentially low-pass filters and thus improve the signal to noise ratio at the expense of the reduced spatial resolution of the reconstructed image. To improve the reconstructed spatial resolution, measured phase contrast projections with high edge enhancement and the phase projections retrieved by TIE-Hom were weighted summed and fed into an iterative tomographic algorithm within the framework of the adaptive steepest descent projections onto convex sets (ASD-POCS), which was employed for suppressing the image noise in low dose reconstructions because of the sparse-view scanning strategy or low exposure time for single phase contrast projection. The merging strategy decreases the accuracy of the linear model of PB-PCCT and would finally lead to the reconstruction failure in iterative reconstructions. Therefore, the additive median root prior is also introduced in the algorithm to partly increase the model accuracy. The reconstructed spatial resolution and noise performance can be flexibly balanced by a pair of antagonistic hyper-parameters. Validations were performed by the established phase-contrast Feldkamp-Davis-Kress, phase-retrieved Feldkamp-Davis-Kress, conventional ASD-POCS and the proposed enhanced ASD-POCS with a numerical phantom dataset and experimental biomaterial dataset. Simulation results show that the proposed algorithm outperforms the conventional ASD-POCS in spatial evaluation assessments such as root mean square error (a ratio of 9.78%), contrast to noise ratio (CNR) (a ratio of 7.46%), and also frequency evaluation assessments such as modulation transfer function (a ratio of 66.48% of MTF50% (50% MTF value)), noise power spectrum (a ratio of 35.25% of f50% (50% value of the Nyquist frequency)) and noise equivalent quanta (1-2 orders of magnitude at high frequencies). Experimental results again confirm the superiority of proposed strategy relative to the conventional one in terms of edge sharpness and CNR (an average increase of 67.35%).
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3
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Han S, Zhao Y, Li F, Ji D, Li Y, Zheng M, Lv W, Xin X, Zhao X, Qi B, Hu C. Dual-path deep learning reconstruction framework for propagation-based X-ray phase-contrast computed tomography with sparse-view projections. OPTICS LETTERS 2021; 46:3552-3555. [PMID: 34329222 DOI: 10.1364/ol.427547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 06/23/2021] [Indexed: 06/13/2023]
Abstract
Propagation-based X-ray phase-contrast computed tomography (PB-PCCT) can serve as an effective tool for studying organ function and pathologies. However, it usually suffers from a high radiation dose due to the long scan time. To alleviate this problem, we propose a deep learning reconstruction framework for PB-PCCT with sparse-view projections. The framework consists of dual-path deep neural networks, where the edge detection, edge guidance, and artifact removal models are incorporated into two subnetworks. It is worth noting that the framework has the ability to achieve excellent performance by exploiting the data-based knowledge of the sample material characteristics and the model-based knowledge of PB-PCCT. To evaluate the effectiveness and capability of the proposed framework, simulations and real experiments were performed. The results demonstrated that the proposed framework could significantly suppress streaking artifacts and produce high-contrast and high-resolution computed tomography images.
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4
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Hehn L, Gradl R, Voss A, Günther B, Dierolf M, Jud C, Willer K, Allner S, Hammel JU, Hessler R, Morgan KS, Herzen J, Hemmert W, Pfeiffer F. Propagation-based phase-contrast tomography of a guinea pig inner ear with cochlear implant using a model-based iterative reconstruction algorithm. BIOMEDICAL OPTICS EXPRESS 2018; 9:5330-5339. [PMID: 30460131 PMCID: PMC6238946 DOI: 10.1364/boe.9.005330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 08/17/2018] [Accepted: 09/08/2018] [Indexed: 06/09/2023]
Abstract
Propagation-based phase-contrast computed tomography has become a valuable tool for visualization of three-dimensional biological samples, due to its high contrast between materials with similar attenuation properties. However, one of the most-widely used phase-retrieval algorithms imposes a homogeneity assumption onto the sample, which leads to artifacts for numerous applications where this assumption is violated. Prominent examples are biological samples with highly-absorbing implants. Using synchrotron radiation, we demonstrate by the example of a guinea pig inner ear with a cochlear implant electrode, how a recently developed model-based iterative algorithm for propagation-based phase-contrast computed tomography yields distinct benefits for such a task. We find that the model-based approach improves the overall image quality, removes the detrimental influence of the implant and accurately visualizes the cochlea.
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Affiliation(s)
- Lorenz Hehn
- Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching,
Germany
- Department of Diagnostic and Interventional Radiology, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich,
Germany
| | - Regine Gradl
- Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching,
Germany
- Institute for Advanced Study, Technical University of Munich, 85748 Garching,
Germany
| | - Andrej Voss
- Bio-Inspired Information Processing, Munich School of BioEngineering, Munich School of Robotics and Machine Intelligence, Technical University of Munich, 85748 Garching,
Germany
| | - Benedikt Günther
- Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching,
Germany
- Max-Planck-Institute of Quantum Optics, 85748 Garching,
Germany
| | - Martin Dierolf
- Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching,
Germany
| | - Christoph Jud
- Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching,
Germany
| | - Konstantin Willer
- Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching,
Germany
- Department of Diagnostic and Interventional Radiology, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich,
Germany
| | - Sebastian Allner
- Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching,
Germany
| | - Jörg U. Hammel
- Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht,
Germany
- Institut für Zoologie und Evolutionsforschung mit Phyletischem Museum, Ernst-Haeckel-Haus und Biologiedidaktik, Friedrich-Schiller-Universität Jena, 07743 Jena,
Germany
| | | | - Kaye S. Morgan
- Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching,
Germany
- Institute for Advanced Study, Technical University of Munich, 85748 Garching,
Germany
- School of Physics and Astronomy, Monash University, Clayton VIC 3800,
Australia
| | - Julia Herzen
- Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching,
Germany
| | - Werner Hemmert
- Bio-Inspired Information Processing, Munich School of BioEngineering, Munich School of Robotics and Machine Intelligence, Technical University of Munich, 85748 Garching,
Germany
| | - Franz Pfeiffer
- Chair of Biomedical Physics, Department of Physics and Munich School of BioEngineering, Technical University of Munich, 85748 Garching,
Germany
- Department of Diagnostic and Interventional Radiology, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich,
Germany
- Institute for Advanced Study, Technical University of Munich, 85748 Garching,
Germany
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5
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Lovric G, Vogiatzis Oikonomidis I, Mokso R, Stampanoni M, Roth-Kleiner M, Schittny JC. Automated computer-assisted quantitative analysis of intact murine lungs at the alveolar scale. PLoS One 2017; 12:e0183979. [PMID: 28934236 PMCID: PMC5608210 DOI: 10.1371/journal.pone.0183979] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 08/15/2017] [Indexed: 12/13/2022] Open
Abstract
Using state-of-the-art X-ray tomographic microscopy we can image lung tissue in three dimensions in intact animals down to a micrometer precision. The structural complexity and hierarchical branching scheme of the lung at this level of details, however, renders the extraction of biologically relevant quantities particularly challenging. We have developed a methodology for a detailed description of lung inflation patterns by measuring the size and the local curvature of the parenchymal airspaces. These quantitative tools for morphological and topological analyses were applied to high-resolution murine 3D lung image data, inflated at different pressure levels under immediate post mortem conditions. We show for the first time direct indications of heterogeneous intra-lobar and inter-lobar distension patterns at the alveolar level. Furthermore, we did not find any indication that a cyclic opening-and-collapse (recruitment) of a large number of alveoli takes place.
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Affiliation(s)
- Goran Lovric
- Centre d’Imagerie BioMédicale, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
- Swiss Light Source, Paul Scherrer Institute, 5234 Villigen, Switzerland
- Institute for Biomedical Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Ioannis Vogiatzis Oikonomidis
- Swiss Light Source, Paul Scherrer Institute, 5234 Villigen, Switzerland
- Institute of Anatomy, University of Bern, 3012 Bern, Switzerland
| | - Rajmund Mokso
- Max IV Laboratory, Lund University, SE-221 00 Lund, Sweden
| | - Marco Stampanoni
- Swiss Light Source, Paul Scherrer Institute, 5234 Villigen, Switzerland
- Institute for Biomedical Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Matthias Roth-Kleiner
- Clinic of Neonatology, University Hospital of Lausanne (CHUV), 1011 Lausanne, Switzerland
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6
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Gradl R, Dierolf M, Hehn L, Günther B, Yildirim AÖ, Gleich B, Achterhold K, Pfeiffer F, Morgan KS. Propagation-based Phase-Contrast X-ray Imaging at a Compact Light Source. Sci Rep 2017; 7:4908. [PMID: 28687726 PMCID: PMC5501835 DOI: 10.1038/s41598-017-04739-w] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 05/18/2017] [Indexed: 11/09/2022] Open
Abstract
We demonstrate the applicability of propagation-based X-ray phase-contrast imaging at a laser-assisted compact light source with known phantoms and the lungs and airways of a mouse. The Munich Compact Light Source provides a quasi-monochromatic beam with partial spatial coherence, and high flux relative to other non-synchrotron sources (up to 1010 ph/s). In our study we observe significant edge-enhancement and quantitative phase-retrieval is successfully performed on the known phantom. Furthermore the images of a small animal show the potential for live bio-imaging research studies that capture biological function using short exposures.
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Affiliation(s)
- Regine Gradl
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, James-Franck-Str. 1, 85748, Garching, Germany. .,Munich School of BioEngineering, Technical University of Munich, Boltzmannstr. 11, 85748, Garching, Germany. .,Institute for Advanced Studies, Technical University of Munich, Lichtenbergstrasse 2 a, 85748, Garching, Germany.
| | - Martin Dierolf
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, James-Franck-Str. 1, 85748, Garching, Germany.,Munich School of BioEngineering, Technical University of Munich, Boltzmannstr. 11, 85748, Garching, Germany
| | - Lorenz Hehn
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, James-Franck-Str. 1, 85748, Garching, Germany.,Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, München, Germany
| | - Benedikt Günther
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, James-Franck-Str. 1, 85748, Garching, Germany.,Munich School of BioEngineering, Technical University of Munich, Boltzmannstr. 11, 85748, Garching, Germany.,Max-Plank-Institute for Quantum Optics, Hans-Kopfermannstr. 1, 85748, Garching, Germany
| | - Ali Önder Yildirim
- Comprehensive Pneumologie Center (CPC), Institute of Lung Biology and Disease, Helmholtz Zentrum München, Member of the German Lung Center for Lung Research (DZL), Ingolstädter Landstr. 1, 85764, Neuherberg, Germany
| | - Bernhard Gleich
- Munich School of BioEngineering, Technical University of Munich, Boltzmannstr. 11, 85748, Garching, Germany
| | - Klaus Achterhold
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, James-Franck-Str. 1, 85748, Garching, Germany.,Munich School of BioEngineering, Technical University of Munich, Boltzmannstr. 11, 85748, Garching, Germany
| | - Franz Pfeiffer
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, James-Franck-Str. 1, 85748, Garching, Germany.,Munich School of BioEngineering, Technical University of Munich, Boltzmannstr. 11, 85748, Garching, Germany.,Institute for Advanced Studies, Technical University of Munich, Lichtenbergstrasse 2 a, 85748, Garching, Germany.,Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, München, Germany
| | - Kaye Susannah Morgan
- Chair of Biomedical Physics, Department of Physics, Technical University of Munich, James-Franck-Str. 1, 85748, Garching, Germany.,Institute for Advanced Studies, Technical University of Munich, Lichtenbergstrasse 2 a, 85748, Garching, Germany.,School of Physics and Astronomy, Monash University, Clayton, Victoria, 3800, Australia
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7
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Brun F, Massimi L, Fratini M, Dreossi D, Billé F, Accardo A, Pugliese R, Cedola A. SYRMEP Tomo Project: a graphical user interface for customizing CT reconstruction workflows. ACTA ACUST UNITED AC 2017; 3:4. [PMID: 28261542 PMCID: PMC5313567 DOI: 10.1186/s40679-016-0036-8] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Accepted: 12/23/2016] [Indexed: 11/10/2022]
Abstract
When considering the acquisition of experimental synchrotron radiation (SR) X-ray CT data, the reconstruction workflow cannot be limited to the essential computational steps of flat fielding and filtered back projection (FBP). More refined image processing is often required, usually to compensate artifacts and enhance the quality of the reconstructed images. In principle, it would be desirable to optimize the reconstruction workflow at the facility during the experiment (beamtime). However, several practical factors affect the image reconstruction part of the experiment and users are likely to conclude the beamtime with sub-optimal reconstructed images. Through an example of application, this article presents SYRMEP Tomo Project (STP), an open-source software tool conceived to let users design custom CT reconstruction workflows. STP has been designed for post-beamtime (off-line use) and for a new reconstruction of past archived data at user's home institution where simple computing resources are available. Releases of the software can be downloaded at the Elettra Scientific Computing group GitHub repository https://github.com/ElettraSciComp/STP-Gui.
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Affiliation(s)
- Francesco Brun
- National Research Council-Institute of Nanotechnology (CNR-Nanotec), c/o University La Sapienza, P.le Aldo Moro, 5, 00185 Rome, Italy.,Department of Engineering and Architecture, University of Trieste, Via A. Valerio, 6/1, 34127 Trieste, Italy.,Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5 in Area Science Park, 34149 Basovizza, Trieste Italy
| | - Lorenzo Massimi
- National Research Council-Institute of Nanotechnology (CNR-Nanotec), c/o University La Sapienza, P.le Aldo Moro, 5, 00185 Rome, Italy
| | - Michela Fratini
- National Research Council-Institute of Nanotechnology (CNR-Nanotec), c/o University La Sapienza, P.le Aldo Moro, 5, 00185 Rome, Italy.,Fondazione Santa Lucia, Via Ardeatina, 306, 00179 Roma, Italy
| | - Diego Dreossi
- Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5 in Area Science Park, 34149 Basovizza, Trieste Italy
| | - Fulvio Billé
- Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5 in Area Science Park, 34149 Basovizza, Trieste Italy
| | - Agostino Accardo
- Department of Engineering and Architecture, University of Trieste, Via A. Valerio, 6/1, 34127 Trieste, Italy
| | - Roberto Pugliese
- Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5 in Area Science Park, 34149 Basovizza, Trieste Italy
| | - Alessia Cedola
- National Research Council-Institute of Nanotechnology (CNR-Nanotec), c/o University La Sapienza, P.le Aldo Moro, 5, 00185 Rome, Italy
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8
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The use of contrast enhancement techniques in X-ray imaging of lithium–ion battery electrodes. Chem Eng Sci 2016. [DOI: 10.1016/j.ces.2016.04.023] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Fatty acids for controlled release applications: A comparison between prilling and solid lipid extrusion as manufacturing techniques. Eur J Pharm Biopharm 2015; 97:173-84. [DOI: 10.1016/j.ejpb.2015.09.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 07/30/2015] [Accepted: 09/21/2015] [Indexed: 11/22/2022]
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10
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Yang F, Griffa M, Bonnin A, Mokso R, DI Bella C, Münch B, Kaufmann R, Lura P. Visualization of water drying in porous materials by X-ray phase contrast imaging. J Microsc 2015; 261:88-104. [PMID: 26469285 DOI: 10.1111/jmi.12319] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Accepted: 08/30/2015] [Indexed: 11/30/2022]
Abstract
We present in this study results from X-ray tomographic microscopy with synchrotron radiation performed both in attenuation and phase contrast modes on a limestone sample during two stages of water drying. No contrast agent was used in order to increase the X-ray attenuation by water. We show that only by using the phase contrast mode it is possible to achieve enough water content change resolution to investigate the drying process at the pore-scale. We performed 3D image analysis of the time-differential phase contrast tomogram. We show by the results of such analysis that it is possible to obtain a reliable characterization of the spatial redistribution of water in the resolved pore system in agreement with what expected from the theory of drying in porous media and from measurements performed with other approaches. We thus show the potential of X-ray phase contrast imaging for pore-scale investigations of reactive water transport processes which cannot be imaged by adding a contrast agent for exploiting the standard attenuation contrast imaging mode.
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Affiliation(s)
- F Yang
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland.,Institute for Building Materials (IfB), Swiss Federal Institute of Technology Zurich (ETHZ), Zürich, Switzerland
| | - M Griffa
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - A Bonnin
- Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland.,Center for Biomedical Imaging, Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland
| | - R Mokso
- Swiss Light Source, Paul Scherrer Institute, Villigen, Switzerland
| | - C DI Bella
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland.,Institute for Building Materials (IfB), Swiss Federal Institute of Technology Zurich (ETHZ), Zürich, Switzerland
| | - B Münch
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - R Kaufmann
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
| | - P Lura
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland.,Institute for Building Materials (IfB), Swiss Federal Institute of Technology Zurich (ETHZ), Zürich, Switzerland
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11
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Murrie RP, Morgan KS, Maksimenko A, Fouras A, Paganin DM, Hall C, Siu KKW, Parsons DW, Donnelley M. Live small-animal X-ray lung velocimetry and lung micro-tomography at the Australian Synchrotron Imaging and Medical Beamline. JOURNAL OF SYNCHROTRON RADIATION 2015; 22:1049-1055. [PMID: 26134810 DOI: 10.1107/s1600577515006001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Accepted: 03/24/2015] [Indexed: 06/04/2023]
Abstract
The high flux and coherence produced at long synchrotron beamlines makes them well suited to performing phase-contrast X-ray imaging of the airways and lungs of live small animals. Here, findings of the first live-animal imaging on the Imaging and Medical Beamline (IMBL) at the Australian Synchrotron are reported, demonstrating the feasibility of performing dynamic lung motion measurement and high-resolution micro-tomography. Live anaesthetized mice were imaged using 30 keV monochromatic X-rays at a range of sample-to-detector propagation distances. A frame rate of 100 frames s(-1) allowed lung motion to be determined using X-ray velocimetry. A separate group of humanely killed mice and rats were imaged by computed tomography at high resolution. Images were reconstructed and rendered to demonstrate the capacity for detailed, user-directed display of relevant respiratory anatomy. The ability to perform X-ray velocimetry on live mice at the IMBL was successfully demonstrated. High-quality renderings of the head and lungs visualized both large structures and fine details of the nasal and respiratory anatomy. The effect of sample-to-detector propagation distance on contrast and resolution was also investigated, demonstrating that soft tissue contrast increases, and resolution decreases, with increasing propagation distance. This new capability to perform live-animal imaging and high-resolution micro-tomography at the IMBL enhances the capability for investigation of respiratory diseases and the acceleration of treatment development in Australia.
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Affiliation(s)
- Rhiannon P Murrie
- School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia
| | - Kaye S Morgan
- School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia
| | - Anton Maksimenko
- Imaging and Medical Beamline, Australian Synchrotron, Clayton, VIC 3800, Australia
| | - Andreas Fouras
- Division of Biological Engineering, Monash University, Clayton, VIC 3800, Australia
| | - David M Paganin
- School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia
| | - Chris Hall
- Imaging and Medical Beamline, Australian Synchrotron, Clayton, VIC 3800, Australia
| | - Karen K W Siu
- School of Physics and Astronomy, Monash University, Clayton, VIC 3800, Australia
| | - David W Parsons
- Robinson Research Institute, University of Adelaide, SA 5001, Australia
| | - Martin Donnelley
- Robinson Research Institute, University of Adelaide, SA 5001, Australia
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