1
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Foylan S, Schniete JK, Kölln LS, Dempster J, Hansen CG, Shaw M, Bushell TJ, McConnell G. Mesoscale standing wave imaging. J Microsc 2024; 295:33-41. [PMID: 37156549 DOI: 10.1111/jmi.13189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 05/03/2023] [Accepted: 05/04/2023] [Indexed: 05/10/2023]
Abstract
Standing wave (SW) microscopy is a method that uses an interference pattern to excite fluorescence from labelled cellular structures and produces high-resolution images of three-dimensional objects in a two-dimensional dataset. SW microscopy is performed with high-magnification, high-numerical aperture objective lenses, and while this results in high-resolution images, the field of view is very small. Here we report upscaling of this interference imaging method from the microscale to the mesoscale using the Mesolens, which has the unusual combination of a low-magnification and high-numerical aperture. With this method, we produce SW images within a field of view of 4.4 mm × 3.0 mm that can readily accommodate over 16,000 cells in a single dataset. We demonstrate the method using both single-wavelength excitation and the multi-wavelength SW method TartanSW. We show application of the method for imaging of fixed and living cells specimens, with the first application of SW imaging to study cells under flow conditions.
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Affiliation(s)
- Shannan Foylan
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Jana Katharina Schniete
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Lisa Sophie Kölln
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - John Dempster
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Carsten Gram Hansen
- Institute for Regeneration and Repair, Queen's Medical Research Institute, University of Edinburgh Centre for Inflammation Research, Edinburgh, UK
| | - Michael Shaw
- Faculty of Engineering Sciences, Department of Computer Science, University College London, London, UK
- Biometrology Group, National Physical Laboratory, Teddington, UK
| | - Trevor John Bushell
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Gail McConnell
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
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2
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Zhdanov AV, Sen R, Devoy C, Li L, Tangney M, Papkovsky DB. Analysis of tumour oxygenation in model animals on a phosphorescence lifetime based macro-imager. Sci Rep 2023; 13:18732. [PMID: 37907625 PMCID: PMC10618169 DOI: 10.1038/s41598-023-46224-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 10/30/2023] [Indexed: 11/02/2023] Open
Abstract
Monitoring of tissue O2 is essential for cancer development and treatment, as hypoxic tumour regions develop resistance to radio- and chemotherapy. We describe a minimally invasive technique for the monitoring of tissue oxygenation in developing grafted tumours, which uses the new phosphorescence lifetime based Tpx3Cam imager. CT26 cells stained with a near-infrared emitting nanoparticulate O2 probe NanO2-IR were injected into mice to produce grafted tumours with characteristic phosphorescence. The tumours were allowed to develop for 3, 7, 10 and 17 days, with O2 imaging experiments performed on live and euthanised animals at different time points. Despite a marked trend towards decreased O2 in dead animals, their tumour areas produced phosphorescence lifetime values between 44 and 47 µs, which corresponded to hypoxic tissue with 5-20 μM O2. After the O2 imaging in animals, confocal Phosphorescence Lifetime Imaging Microscopy was conducted to examine the distribution of NanO2-IR probe in the tumours, which were excised, fixed and sliced for the purpose. The probe remained visible as bright and discrete 'islands' embedded in the tumour tissue until day 17 of tumour growth. Overall, this O2 macro-imaging method using NanO2-IR holds promise for long-term studies with grafted tumours in live animal models, providing quantitative 2D mapping of tissue O2.
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Affiliation(s)
- Alexander V Zhdanov
- School of Biochemistry and Cell Biology, University College Cork, Pharmacy Building, College Road, Cork, Ireland
| | - Rajannya Sen
- School of Biochemistry and Cell Biology, University College Cork, Pharmacy Building, College Road, Cork, Ireland
| | - Ciaran Devoy
- Cancer Research @UCC, University College Cork, Cork, Ireland
| | - Liang Li
- School of Biochemistry and Cell Biology, University College Cork, Pharmacy Building, College Road, Cork, Ireland
| | - Mark Tangney
- Cancer Research @UCC, University College Cork, Cork, Ireland
| | - Dmitri B Papkovsky
- School of Biochemistry and Cell Biology, University College Cork, Pharmacy Building, College Road, Cork, Ireland.
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3
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Mei X, Fang Q, Selvaganapathy PR. Three-dimensional oxygen concentration monitoring in hydrogels using low-cost phosphorescence lifetime imaging for tissue engineering. BIOMEDICAL OPTICS EXPRESS 2023; 14:4759-4774. [PMID: 37791279 PMCID: PMC10545174 DOI: 10.1364/boe.493340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 07/19/2023] [Accepted: 07/21/2023] [Indexed: 10/05/2023]
Abstract
Oxygen concentration measurement in 3D hydrogels is vital in 3D cell culture and tissue engineering. However, standard 3D imaging systems capable of measuring oxygen concentration with adequate precision are based on advanced microscopy platforms, which are not accessible in many laboratories due to the system's complexity and the high price. In this work, we present a fast and low-cost phosphorescence lifetime imaging design for measuring the lifetime of oxygen-quenched phosphorescence emission with 0.25 µs temporal precision and sub-millimeter spatial resolution in 3D. By combining light-sheet illumination and the frequency-domain lifetime measurement using a commercial rolling-shutter CMOS camera in the structure of a conventional optical microscope, this design is highly customizable to accommodate application-specific research needs while also being low-cost as compared to advanced instruments. As a demonstration, we made a fluidic device with a gas-permeable film to create an artificial oxygen gradient in the hydrogel sample. Dye-embedded beads were distributed in the hydrogel to conduct continuous emission lifetime monitoring when nitrogen was pumped through the fluidic channel and changed oxygen distribution in the sample. The dynamics of the changes in lifetime co-related with their location in the gel of size 0.5 mm×1.5 mm×700 µm demonstrate the ability of this design to measure the oxygen concentration stably and precisely in 3D samples.
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Affiliation(s)
- Xu Mei
- School of Biomedical Engineering, McMaster University, 1280 Main Street W, Hamilton, ON L8S 4L8, Canada
| | - Qiyin Fang
- School of Biomedical Engineering, McMaster University, 1280 Main Street W, Hamilton, ON L8S 4L8, Canada
- Department of Engineering Physics, McMaster University, 1280 Main Street W, Hamilton, ON L8S 4L8, Canada
| | - P. Ravi Selvaganapathy
- School of Biomedical Engineering, McMaster University, 1280 Main Street W, Hamilton, ON L8S 4L8, Canada
- Department of Mechanical Engineering, McMaster University, 1280 Main Street W, Hamilton, ON L8S 4L8, Canada
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4
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Mathew A, Giskes F, Lekkas A, Greisch JF, Eijkel GB, Anthony IGM, Fort K, Heck AJR, Papanastasiou D, Makarov AA, Ellis SR, Heeren RMA. An Orbitrap/Time-of-Flight Mass Spectrometer for Photofragment Ion Imaging and High-Resolution Mass Analysis of Native Macromolecular Assemblies. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023. [PMID: 37319176 DOI: 10.1021/jasms.3c00053] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
We discuss the design, development, and evaluation of an Orbitrap/time-of-flight (TOF) mass spectrometry (MS)-based instrument with integrated UV photodissociation (UVPD) and time/mass-to-charge ratio (m/z)-resolved imaging for the comprehensive study of the higher-order molecular structure of macromolecular assemblies (MMAs). A bespoke TOF analyzer has been coupled to the higher-energy collisional dissociation cell of an ultrahigh mass range hybrid quadrupole-Orbitrap MS. A 193 nm excimer laser was employed to photofragment MMA ions. A combination of microchannel plates (MCPs)-Timepix (TPX) quad and MCPs-phosphor screen-TPX3CAM assemblies have been used as axial and orthogonal imaging detectors, respectively. The instrument can operate in four different modes, where the UVPD-generated fragment ions from the native MMA ions can be measured with high-mass resolution or imaged in a mass-resolved manner to reveal the relative positions of the UVPD fragments postdissociation. This information is intended to be utilized for retrieving higher-order molecular structural details that include the conformation, subunit stoichiometry, and molecular interactions as well as to understand the dissociation dynamics of the MMAs in the gas phase.
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Affiliation(s)
- Anjusha Mathew
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Frans Giskes
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Alexandros Lekkas
- Fasmatech Science and Technology, Demokritos NCSR, 15310 Agia Paraskevi, Athens, Greece
| | - Jean-François Greisch
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Centre for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
- Netherlands Proteomics Center, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Gert B Eijkel
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Ian G M Anthony
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
| | - Kyle Fort
- Thermo Fisher Scientific (Bremen) GmbH, 28199 Bremen, Germany
| | - Albert J R Heck
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Centre for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
- Netherlands Proteomics Center, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | | | - Alexander A Makarov
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Centre for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
- Thermo Fisher Scientific (Bremen) GmbH, 28199 Bremen, Germany
| | - Shane R Ellis
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - Ron M A Heeren
- Maastricht MultiModal Molecular Imaging (M4i) Institute, Division of Imaging Mass Spectrometry (IMS), Maastricht University, 6229 ER Maastricht, The Netherlands
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5
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Liu X, Skripka A, Lai Y, Jiang C, Liu J, Vetrone F, Liang J. Fast wide-field upconversion luminescence lifetime thermometry enabled by single-shot compressed ultrahigh-speed imaging. Nat Commun 2021; 12:6401. [PMID: 34737314 PMCID: PMC8568918 DOI: 10.1038/s41467-021-26701-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 10/13/2021] [Indexed: 11/13/2022] Open
Abstract
Photoluminescence lifetime imaging of upconverting nanoparticles is increasingly featured in recent progress in optical thermometry. Despite remarkable advances in photoluminescent temperature indicators, existing optical instruments lack the ability of wide-field photoluminescence lifetime imaging in real time, thus falling short in dynamic temperature mapping. Here, we report video-rate upconversion temperature sensing in wide field using single-shot photoluminescence lifetime imaging thermometry (SPLIT). Developed from a compressed-sensing ultrahigh-speed imaging paradigm, SPLIT first records wide-field luminescence intensity decay compressively in two views in a single exposure. Then, an algorithm, built upon the plug-and-play alternating direction method of multipliers, is used to reconstruct the video, from which the extracted lifetime distribution is converted to a temperature map. Using the core/shell NaGdF4:Er3+,Yb3+/NaGdF4 upconverting nanoparticles as the lifetime-based temperature indicators, we apply SPLIT in longitudinal wide-field temperature monitoring beneath a thin scattering medium. SPLIT also enables video-rate temperature mapping of a moving biological sample at single-cell resolution.
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Affiliation(s)
- Xianglei Liu
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1S2, Canada
| | - Artiom Skripka
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1S2, Canada
- Nanomaterials for Bioimaging Group, Departamento de Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, Madrid, 28049, Spain and The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Yingming Lai
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1S2, Canada
| | - Cheng Jiang
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1S2, Canada
| | - Jingdan Liu
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1S2, Canada
| | - Fiorenzo Vetrone
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1S2, Canada.
| | - Jinyang Liang
- Centre Énergie Matériaux Télécommunications, Institut National de la Recherche Scientifique, 1650 boulevard Lionel-Boulet, Varennes, Québec, J3X1S2, Canada.
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6
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Losko AS, Han Y, Schillinger B, Tartaglione A, Morgano M, Strobl M, Long J, Tremsin AS, Schulz M. New perspectives for neutron imaging through advanced event-mode data acquisition. Sci Rep 2021; 11:21360. [PMID: 34725403 PMCID: PMC8560941 DOI: 10.1038/s41598-021-00822-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 10/15/2021] [Indexed: 11/09/2022] Open
Abstract
Imaging using scintillators is a widespread and cost-effective approach in radiography. While different types of scintillator and sensor configurations exist, it can be stated that the detection efficiency and resolution of a scintillator-based system strongly depend on the scintillator material and its thickness. Recently developed event-driven detectors are capable of registering spots of light emitted by the scintillator after a particle interaction, allowing to reconstruct the Center-of-Mass of the interaction within the scintillator. This results in a more precise location of the event and therefore provides a pathway to overcome the scintillator thickness limitation and increase the effective spatial resolution of the system. Utilizing this principle, we present a detector capable of Time-of-Flight imaging with an adjustable field-of-view, ad-hoc binning and re-binning of data based on the requirements of the experiment including the possibility of particle discrimination via the analysis of the event shape in space and time. It is considered that this novel concept might replace regular cameras in neutron imaging detectors as it provides superior detection capabilities with the most recent results providing an increase by a factor 3 in image resolution and an increase by up to a factor of 7.5 in signal-to-noise for thermal neutron imaging.
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Affiliation(s)
- A S Losko
- Forschungs-Neutronenquelle Heinz Maier-Leibnitz, 85748, Garching, Germany.
| | - Y Han
- Forschungs-Neutronenquelle Heinz Maier-Leibnitz, 85748, Garching, Germany
| | - B Schillinger
- Forschungs-Neutronenquelle Heinz Maier-Leibnitz, 85748, Garching, Germany
| | - A Tartaglione
- Forschungs-Neutronenquelle Heinz Maier-Leibnitz, 85748, Garching, Germany
| | - M Morgano
- Paul Scherrer Institute, 5232, Villigen, Switzerland
| | - M Strobl
- Paul Scherrer Institute, 5232, Villigen, Switzerland
| | - J Long
- Amsterdam Scientific Instruments, 1098XG, Amsterdam, The Netherlands
| | - A S Tremsin
- Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, 94720, USA
| | - M Schulz
- Forschungs-Neutronenquelle Heinz Maier-Leibnitz, 85748, Garching, Germany
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7
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Sen R, Zhdanov AV, Bastiaanssen TFS, Hirvonen LM, Svihra P, Fitzgerald P, Cryan JF, Andersson-Engels S, Nomerotski A, Papkovsky DB. Mapping O 2 concentration in ex-vivo tissue samples on a fast PLIM macro-imager. Sci Rep 2020; 10:19006. [PMID: 33149165 PMCID: PMC7642408 DOI: 10.1038/s41598-020-75928-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 10/08/2020] [Indexed: 12/27/2022] Open
Abstract
O2 PLIM microscopy was employed in various studies, however current platforms have limitations in sensitivity, image acquisition speed, accuracy and general usability. We describe a new PLIM imager based on the Timepix3 camera (Tpx3cam) and its application for imaging of O2 concentration in various tissue samples stained with a nanoparticle based probe, NanO2-IR. Upon passive staining of mouse brain, lung or intestinal tissue surface with minute quantities of NanO2-IR or by microinjecting the probe into the lumen of small or large intestine fragments, robust phosphorescence intensity and lifetime signals were produced, which allow mapping of O2 in the tissue within 20 s. Inhibition of tissue respiration or limitation of O2 diffusion to tissue produced the anticipated increases or decreases in O2 levels, respectively. The difference in O2 concentration between the colonic lumen and air-exposed serosal surface was around 140 µM. Furthermore, subcutaneous injection of 5 µg of the probe in intact organs (a paw or tail of sacrificed mice) enabled efficient O2 imaging at tissue depths of up to 0.5 mm. Overall, the PLIM imager holds promise for metabolic imaging studies with various ex vivo models of animal tissue, and also for use in live animals.
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Affiliation(s)
- Rajannya Sen
- School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland
| | - Alexander V Zhdanov
- School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland
| | - Thomaz F S Bastiaanssen
- APC Microbiome Ireland, University College Cork, Cork, Ireland
- Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland
| | - Liisa M Hirvonen
- Centre for Microscopy, Characterisation and Analysis (CMCA), The University of Western Australia, Crawley, WA, 6009, Australia
| | - Peter Svihra
- Department of Physics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, 115 19, Prague, Czech Republic
- Department of Physics and Astronomy, School of Natural Sciences, The University of Manchester, Manchester, M139PL, UK
| | | | - John F Cryan
- APC Microbiome Ireland, University College Cork, Cork, Ireland
- Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland
| | | | - Andrei Nomerotski
- Physics Department, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Dmitri B Papkovsky
- School of Biochemistry and Cell Biology, University College Cork, Cork, Ireland.
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8
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Nomerotski A, Keach M, Stankus P, Svihra P, Vintskevich S. Counting of Hong-Ou-Mandel Bunched Optical Photons Using a Fast Pixel Camera. SENSORS (BASEL, SWITZERLAND) 2020; 20:E3475. [PMID: 32575595 PMCID: PMC7349248 DOI: 10.3390/s20123475] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/14/2020] [Accepted: 06/17/2020] [Indexed: 11/16/2022]
Abstract
The uses of a silicon-pixel camera with very good time resolution (∼nanosecond) for detecting multiple, bunched optical photons is explored. We present characteristics of the camera and describe experiments proving its counting capabilities. We use a spontaneous parametric down-conversion source to generate correlated photon pairs, and exploit the Hong-Ou-Mandel (HOM) interference effect in a fiber-coupled beam splitter to bunch the pair onto the same output fiber. It is shown that the time and spatial resolution of the camera enables independent detection of two photons emerging simultaneously from a single spatial mode.
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Affiliation(s)
- Andrei Nomerotski
- Brookhaven National Laboratory, Upton, NY 11973, USA; (M.K.); (P.S.)
| | - Michael Keach
- Brookhaven National Laboratory, Upton, NY 11973, USA; (M.K.); (P.S.)
| | - Paul Stankus
- Brookhaven National Laboratory, Upton, NY 11973, USA; (M.K.); (P.S.)
| | - Peter Svihra
- Department of Physics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, 115 19 Prague, Czech Republic;
- Department of Physics and Astronomy, School of Natural Sciences, University of Manchester, Manchester M13 9PL, UK
| | - Stephen Vintskevich
- Moscow Institute of Physics and Technology, Institutskii Per. 9, Dolgoprudny, 141700 Moscow, Moscow Region, Russia;
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9
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Liu Y, Gu Y, Yuan W, Zhou X, Qiu X, Kong M, Wang Q, Feng W, Li F. Quantitative Mapping of Liver Hypoxia in Living Mice Using Time-Resolved Wide-Field Phosphorescence Lifetime Imaging. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:1902929. [PMID: 32537394 PMCID: PMC7284196 DOI: 10.1002/advs.201902929] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 01/31/2020] [Accepted: 02/13/2020] [Indexed: 05/28/2023]
Abstract
Hypoxia has been identified to contribute the pathogenesis of a wide range of liver diseases, and therefore, quantitative mapping of liver hypoxia is important for providing critical information in the diagnosis and treatment of hepatic diseases. However, the existing imaging methods are unsuitable to quantitatively assess liver hypoxia due to the need of liver-specific contrast agents and be easily affected by other imaging factors. Here, a time-resolved lifetime-based imaging method is established for quantitative mapping of the distribution of hypoxia in the livers of mice by combining a wide-field luminescence lifetime imaging system with an oxygen-sensitive nanoprobe. It is shown that the method is suitable for real-time quantification of the change of oxygen pressure in the process of hepatic ischemia-reperfusion of the mouse. Moreover, the developed lifetime imaging methodology is used to quantitatively map liver hypoxia regions in the mouse model of orthotopic liver tumor, where the average oxygen pressure in tumorous liver is far below the normal liver.
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Affiliation(s)
- Yawei Liu
- Department of Chemistry and State Key Laboratory of Molecular Engineering of PolymersFudan University220 Handan RoadShanghai200433P. R. China
| | - Yuyang Gu
- Department of Chemistry and State Key Laboratory of Molecular Engineering of PolymersFudan University220 Handan RoadShanghai200433P. R. China
| | - Wei Yuan
- Department of Chemistry and State Key Laboratory of Molecular Engineering of PolymersFudan University220 Handan RoadShanghai200433P. R. China
| | - Xiaobo Zhou
- Department of Chemistry and State Key Laboratory of Molecular Engineering of PolymersFudan University220 Handan RoadShanghai200433P. R. China
| | - Xiaochen Qiu
- Department of Chemistry and State Key Laboratory of Molecular Engineering of PolymersFudan University220 Handan RoadShanghai200433P. R. China
| | - Mengya Kong
- Department of Chemistry and State Key Laboratory of Molecular Engineering of PolymersFudan University220 Handan RoadShanghai200433P. R. China
| | - Qingbing Wang
- Department of Interventional RadiologyRuijin HospitalShanghai Jiao Tong University School of Medicine197 Rui Jin Er RoadShanghai200025China
| | - Wei Feng
- Department of Chemistry and State Key Laboratory of Molecular Engineering of PolymersFudan University220 Handan RoadShanghai200433P. R. China
| | - Fuyou Li
- Department of Chemistry and State Key Laboratory of Molecular Engineering of PolymersFudan University220 Handan RoadShanghai200433P. R. China
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