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Ford NL, Tan S, Deman P. An investigation of radiation damage in rat lungs following dual-energy micro-CT imaging. Biomed Phys Eng Express 2019. [DOI: 10.1088/2057-1976/aaf240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Thomlinson W, Elleaume H, Porra L, Suortti P. K-edge subtraction synchrotron X-ray imaging in bio-medical research. Phys Med 2018; 49:58-76. [DOI: 10.1016/j.ejmp.2018.04.389] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 04/12/2018] [Accepted: 04/16/2018] [Indexed: 11/26/2022] Open
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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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Deman P, Tan S, Belev G, Samadi N, Martinson M, Chapman D, Ford NL. Respiratory-gated KES imaging of a rat model of acute lung injury at the Canadian Light Source. JOURNAL OF SYNCHROTRON RADIATION 2017; 24:679-685. [PMID: 28452761 PMCID: PMC5477483 DOI: 10.1107/s160057751700193x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 02/06/2017] [Indexed: 05/13/2023]
Abstract
In this study, contrast-enhanced X-ray tomographic imaging for monitoring and quantifying respiratory disease in preclinical rodent models is proposed. A K-edge imaging method has been developed at the Canadian Light Source to very accurately obtain measurements of the concentration of iodinated contrast agent in the pulmonary vasculature and inhaled xenon in the airspaces of rats. To compare the iodine and xenon concentration maps, a scout projection image was acquired to define the region of interest within the thorax for imaging and to ensure the same locations were imaged in each K-edge subtraction (KES) acquisition. A method for triggering image acquisition based on the real-time measurements of respiration was also developed to obtain images during end expiration when the lungs are stationary, in contrast to other previously published studies that alter the respiration to accommodate the image acquisition. In this study, images were obtained in mechanically ventilated animals using physiological parameters at the iodine K-edge in vivo and at the xenon K-edge post mortem (but still under mechanical ventilation). The imaging techniques were performed in healthy Brown Norway rats and in age-matched littermates that had an induced lung injury to demonstrate feasibility of the imaging procedures and the ability to correlate the lung injury and the quantitative measurements of contrast agent concentrations between the two KES images. The respiratory-gated KES imaging protocol can be easily adapted to image during any respiratory phase and is feasible for imaging disease models with compromised lung function.
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Affiliation(s)
- P. Deman
- Department of Oral Biological and Medical Sciences, The University of British Columbia, Vancouver, BC, Canada V6T1Z3
| | - S. Tan
- Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada V6T1Z3
| | - G. Belev
- Canadian Light Source, Saskatoon, SK, Canada S7N2V3
| | - N. Samadi
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK, Canada S7N5A9
| | - M. Martinson
- Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK, Canada S7N5A9
| | - D. Chapman
- Canadian Light Source, Saskatoon, SK, Canada S7N2V3
- Division of Biomedical Engineering, and Department of Anatomy and Cell Biology, University of Saskatchewan, Saskatoon, SK, Canada S7N5A9
| | - N. L. Ford
- Department of Oral Biological and Medical Sciences, The University of British Columbia, Vancouver, BC, Canada V6T1Z3
- Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC, Canada V6T1Z3
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Modgil D, Rigie DS, Wang Y, Xiao X, Vargas PA, La Rivière PJ. Material identification in x-ray microscopy and micro CT using multi-layer, multi-color scintillation detectors. Phys Med Biol 2015; 60:8025-45. [PMID: 26422059 DOI: 10.1088/0031-9155/60/20/8025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We demonstrate that a dual-layer, dual-color scintillator construct for microscopic CT, originally proposed to increase sensitivity in synchrotron imaging, can also be used to perform material quantification and classification when coupled with polychromatic illumination. We consider two different approaches to data handling: (1) a data-domain material decomposition whose estimation performance can be characterized by the Cramer-Rao lower bound formalism but which requires careful calibration and (2) an image-domain material classification approach that is more robust to calibration errors. The data-domain analysis indicates that useful levels of SNR (>5) could be achieved in one second or less at typical bending magnet fluxes for relatively large amounts of contrast (several mm path length, such as in a fluid flow experiment) and at typical undulator fluxes for small amount of contrast (tens of microns path length, such as an angiography experiment). The tools introduced could of course be used to study and optimize parameters for a wider range of potential applications. The image domain approach was analyzed in terms of its ability to distinguish different elemental stains by characterizing the angle between the lines traced out in a two-dimensional space of effective attenuation coefficient in the front and back layer images. This approach was implemented at a synchrotron and the results were consistent with simulation predictions.
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Affiliation(s)
- Dimple Modgil
- Department of Radiology, University of Chicago, Chicago, IL 60637, USA
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Leong AFT, Fouras A, Islam MS, Wallace MJ, Hooper SB, Kitchen MJ. High spatiotemporal resolution measurement of regional lung air volumes from 2D phase contrast x-ray images. Med Phys 2013; 40:041909. [PMID: 23556903 DOI: 10.1118/1.4794926] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Described herein is a new technique for measuring regional lung air volumes from two-dimensional propagation-based phase contrast x-ray (PBI) images at very high spatial and temporal resolution. Phase contrast dramatically increases lung visibility and the outlined volumetric reconstruction technique quantifies dynamic changes in respiratory function. These methods can be used for assessing pulmonary disease and injury and for optimizing mechanical ventilation techniques for preterm infants using animal models. METHODS The volumetric reconstruction combines the algorithms of temporal subtraction and single image phase retrieval (SIPR) to isolate the image of the lungs from the thoracic cage in order to measure regional lung air volumes. The SIPR algorithm was used to recover the change in projected thickness of the lungs on a pixel-by-pixel basis (pixel dimensions ≈ 16.2 μm). The technique has been validated using numerical simulation and compared results of measuring regional lung air volumes with and without the use of temporal subtraction for removing the thoracic cage. To test this approach, a series of PBI images of newborn rabbit pups mechanically ventilated at different frequencies was employed. RESULTS Regional lung air volumes measured from PBI images of newborn rabbit pups showed on average an improvement of at least 20% in 16% of pixels within the lungs in comparison to that measured without the use of temporal subtraction. The majority of pixels that showed an improvement was found to be in regions occupied by bone. Applying the volumetric technique to sequences of PBI images of newborn rabbit pups, it is shown that lung aeration at birth can be highly heterogeneous. CONCLUSIONS This paper presents an image segmentation technique based on temporal subtraction that has successfully been used to isolate the lungs from PBI chest images, allowing the change in lung air volume to be measured over regions as small as the pixel size. Using this technique, it is possible to measure changes in regional lung volume at high spatial and temporal resolution during breathing at much lower x-ray dose than would be required using computed tomography.
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Shirai M, Schwenke DO, Tsuchimochi H, Umetani K, Yagi N, Pearson JT. Synchrotron radiation imaging for advancing our understanding of cardiovascular function. Circ Res 2013; 112:209-21. [PMID: 23287456 DOI: 10.1161/circresaha.111.300096] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Synchrotron radiation (SR) is increasingly being used for micro-level and nano-level functional imaging in in vivo animal experiments. This review focuses on the methodology that enables repeated and regional assessment of vessel internal diameter and flow in the resistance vessels of different organ systems. In particular, SR absorption microangiography approaches offer unique opportunities for real-time in vivo vascular imaging in small animals, even during dynamic motion of the heart and lungs. We also describe recent progress in the translation of multiple phase-contrast imaging techniques from ex vivo to in vivo small-animal studies. Furthermore, we also review the utility of SR for multiple pinpoint (dimensions 0.2×0.2 mm) assessments of myocardial function at the cross-bridge level in different regions of the heart using small-angle X-ray scattering, resulting from increases in SR flux at modern facilities. Finally, we present cases for the use of complementary SR approaches to study cardiovascular function, particularly the pathological changes associated with disease using small-animal models.
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Affiliation(s)
- Mikiyasu Shirai
- National Cerebral and Cardiovascular Center Research Institute, Suita, Japan.
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Fouras A, Allison BJ, Kitchen MJ, Dubsky S, Nguyen J, Hourigan K, Siu KKW, Lewis RA, Wallace MJ, Hooper SB. Altered Lung Motion is a Sensitive Indicator of Regional Lung Disease. Ann Biomed Eng 2011; 40:1160-9. [DOI: 10.1007/s10439-011-0493-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Accepted: 12/15/2011] [Indexed: 01/19/2023]
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Kitchen MJ, Paganin DM, Uesugi K, Allison BJ, Lewis RA, Hooper SB, Pavlov KM. Phase contrast image segmentation using a Laue analyser crystal. Phys Med Biol 2011; 56:515-34. [PMID: 21212473 DOI: 10.1088/0031-9155/56/3/001] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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