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Anikeeva M, Sangal M, Speck O, Norquay G, Zuhayra M, Lützen U, Peters J, Jansen O, Hövener JB. Nichtinvasive funktionelle Lungenbildgebung mit hyperpolarisiertem Xenon. ZEITSCHRIFT FÜR PNEUMOLOGIE 2022. [PMCID: PMC9387426 DOI: 10.1007/s10405-022-00462-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hintergrund Die Magnetresonanztomographie (MRT) ist ein nichtinvasives Verfahren mit hervorragendem Weichteilkontrast. Aufgrund der geringen Protonendichte und vielen Luft-Gewebe-Übergängen ist die Anwendung in der Lunge jedoch eingeschränkt, so dass hier häufig röntgenbasierte Methoden eingesetzt werden (mit den bekannten Nachteilen ionisierender Strahlung). Fragestellung In dieser Übersichtsarbeit wird die Lungen-MRT mit hyperpolarisiertem Xenon-129 (Xe-MRT) dargestellt. Die Xe-MRT erlaubt einzigartige wertvolle Einblicke in die Mikrostruktur und Funktion der Lunge, einschließlich des Gasaustauschs mit roten Blutkörperchen – Parameter, die mit klinischen Standardmethoden nicht zugänglich sind. Material und Methoden Durch die magnetische Markierung, die Hyperpolarisierung, wird das Signal von Xenon-129 um bis zu 100.000-fach verstärkt. Hierbei werden die Elektronen von Rubidium mittels Laserlicht zunächst auf 100 % polarisiert und dann durch Stöße auf Xenon übertragen. Danach wird das hyperpolarisierte Gas in einem Beutel zum Patienten gebracht und eingeatmet, kurz bevor die MRT-Aufnahmen beginnen. Ergebnisse Durch spezielle Programmierungen (Sequenzen) in der MRT kann die Ventilation, Mikrostruktur oder der Gasaustausch der Lunge in 3‑D dargestellt werden. Dies ermöglicht z. B. die quantitative Darstellung von Belüftungsdefekten, der Größe der Alveolen, der Gasaufnahme im Gewebe und des Gastransfers ins Blut. Schlussfolgerung Die Xe-MRT liefert einzigartige Informationen über den Zustand der Lunge – nichtinvasiv, in vivo und in weniger als einer Minute.
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Affiliation(s)
- Mariia Anikeeva
- Sektion Biomedizinische Bildgebung, Molecular Imaging North Competence Center (MOIN CC), Klinik für Radiologie und Neuroradiologie, Universtätsklinikum Schleswig-Holstein, Christian-Albrechts-Universität zu Kiel, Am Botanischen Garten 14, 24118 Kiel, Deutschland
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland
| | - Maitreyi Sangal
- Abteilung Biomedizinische Magnetresonanz, Otto-von-Guericke-Universität Magdeburg, Magdeburg, Deutschland
| | - Oliver Speck
- Abteilung Biomedizinische Magnetresonanz, Otto-von-Guericke-Universität Magdeburg, Magdeburg, Deutschland
| | - Graham Norquay
- POLARIS, Department of Infection, Immunity & Cardiovascular Disease, University of Sheffield, Sheffield, Großbritannien
| | - Maaz Zuhayra
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland
| | - Ulf Lützen
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland
| | - Josh Peters
- Sektion Biomedizinische Bildgebung, Molecular Imaging North Competence Center (MOIN CC), Klinik für Radiologie und Neuroradiologie, Universtätsklinikum Schleswig-Holstein, Christian-Albrechts-Universität zu Kiel, Am Botanischen Garten 14, 24118 Kiel, Deutschland
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland
| | - Olav Jansen
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland
| | - Jan-Bernd Hövener
- Sektion Biomedizinische Bildgebung, Molecular Imaging North Competence Center (MOIN CC), Klinik für Radiologie und Neuroradiologie, Universtätsklinikum Schleswig-Holstein, Christian-Albrechts-Universität zu Kiel, Am Botanischen Garten 14, 24118 Kiel, Deutschland
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland
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Anikeeva M, Sangal M, Speck O, Norquay G, Zuhayra M, Lützen U, Peters J, Jansen O, Hövener JB. Nichtinvasive funktionelle Lungenbildgebung mit hyperpolarisiertem Xenon. Radiologe 2022; 62:475-485. [PMID: 35403905 PMCID: PMC8996207 DOI: 10.1007/s00117-022-00993-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/22/2022] [Indexed: 11/25/2022]
Affiliation(s)
- Mariia Anikeeva
- Sektion Biomedizinische Bildgebung, Molecular Imaging North Competence Center (MOIN CC), Klinik für Radiologie und Neuroradiologie, Universtätsklinikum Schleswig-Holstein, Christian-Albrechts-Universität zu Kiel, Am Botanischen Garten 14, 24118, Kiel, Deutschland.
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland.
| | - Maitreyi Sangal
- Abteilung Biomedizinische Magnetresonanz, Otto-von-Guericke-Universität Magdeburg, Magdeburg, Deutschland
| | - Oliver Speck
- Abteilung Biomedizinische Magnetresonanz, Otto-von-Guericke-Universität Magdeburg, Magdeburg, Deutschland
| | - Graham Norquay
- POLARIS, Department of Infection, Immunity & Cardiovascular Disease, University of Sheffield, Sheffield, Großbritannien
| | - Maaz Zuhayra
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland
| | - Ulf Lützen
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland
| | - Josh Peters
- Sektion Biomedizinische Bildgebung, Molecular Imaging North Competence Center (MOIN CC), Klinik für Radiologie und Neuroradiologie, Universtätsklinikum Schleswig-Holstein, Christian-Albrechts-Universität zu Kiel, Am Botanischen Garten 14, 24118, Kiel, Deutschland
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland
| | - Olav Jansen
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland
| | - Jan-Bernd Hövener
- Sektion Biomedizinische Bildgebung, Molecular Imaging North Competence Center (MOIN CC), Klinik für Radiologie und Neuroradiologie, Universtätsklinikum Schleswig-Holstein, Christian-Albrechts-Universität zu Kiel, Am Botanischen Garten 14, 24118, Kiel, Deutschland.
- Klinik für Radiologie und Neuroradiologie, Universitätsklinikum Schleswig-Holstein (UKSH), Kiel, Deutschland.
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Pilot Quality-Assurance Study of a Third-Generation Batch-Mode Clinical-Scale Automated Xenon-129 Hyperpolarizer. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27041327. [PMID: 35209116 PMCID: PMC8879294 DOI: 10.3390/molecules27041327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 02/08/2022] [Accepted: 02/10/2022] [Indexed: 11/28/2022]
Abstract
We present a pilot quality assurance (QA) study of a clinical-scale, automated, third-generation (GEN-3) 129Xe hyperpolarizer employing batch-mode spin-exchange optical pumping (SEOP) with high-Xe densities (50% natural abundance Xe and 50% N2 in ~2.6 atm total pressure sourced from Nova Gas Technologies) and rapid temperature ramping enabled by an aluminum heating jacket surrounding the 0.5 L SEOP cell. 129Xe hyperpolarization was performed over the course of 700 gas loading cycles of the SEOP cell, simulating long-term hyperpolarized contrast agent production in a clinical lung imaging setting. High levels of 129Xe polarization (avg. %PXe = 51.0% with standard deviation σPXe = 3.0%) were recorded with fast 129Xe polarization build-up time constants (avg. Tb = 25.1 min with standard deviation σTb = 3.1 min) across the first 500 SEOP cell refills, using moderate temperatures of 75 °C. These results demonstrate a more than 2-fold increase in build-up rate relative to previously demonstrated results in a comparable QA study on a second-generation (GEN-2) 129Xe hyperpolarizer device, with only a minor reduction in maximum achievable %PXe and with greater consistency over a larger number of SEOP cell refill processes at a similar polarization lifetime duration (avg. T1 = 82.4 min, standard deviation σT1 = 10.8 min). Additionally, the effects of varying SEOP jacket temperatures, distribution of Rb metal, and preparation and operation of the fluid path are quantified in the context of device installation, performance optimization and maintenance to consistently produce high 129Xe polarization values, build-up rates (Tb as low as 6 min) and lifetimes over the course of a typical high-throughput 129Xe polarization SEOP cell life cycle. The results presented further demonstrate the significant potential for hyperpolarized 129Xe contrast agent in imaging and bio-sensing applications on a clinical scale.
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Khan AS, Harvey RL, Birchall JR, Irwin RK, Nikolaou P, Schrank G, Emami K, Dummer A, Barlow MJ, Goodson BM, Chekmenev EY. Enabling Clinical Technologies for Hyperpolarized 129 Xenon Magnetic Resonance Imaging and Spectroscopy. Angew Chem Int Ed Engl 2021; 60:22126-22147. [PMID: 34018297 PMCID: PMC8478785 DOI: 10.1002/anie.202015200] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Indexed: 11/06/2022]
Abstract
Hyperpolarization is a technique that can increase nuclear spin polarization with the corresponding gains in nuclear magnetic resonance (NMR) signals by 4-8 orders of magnitude. When this process is applied to biologically relevant samples, the hyperpolarized molecules can be used as exogenous magnetic resonance imaging (MRI) contrast agents. A technique called spin-exchange optical pumping (SEOP) can be applied to hyperpolarize noble gases such as 129 Xe. Techniques based on hyperpolarized 129 Xe are poised to revolutionize clinical lung imaging, offering a non-ionizing, high-contrast alternative to computed tomography (CT) imaging and conventional proton MRI. Moreover, CT and conventional proton MRI report on lung tissue structure but provide little functional information. On the other hand, when a subject breathes hyperpolarized 129 Xe gas, functional lung images reporting on lung ventilation, perfusion and diffusion with 3D readout can be obtained in seconds. In this Review, the physics of SEOP is discussed and the different production modalities are explained in the context of their clinical application. We also briefly compare SEOP to other hyperpolarization methods and conclude this paper with the outlook for biomedical applications of hyperpolarized 129 Xe to lung imaging and beyond.
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Affiliation(s)
- Alixander S Khan
- Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Rebecca L Harvey
- Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Jonathan R Birchall
- Intergrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), 5101 Cass Avenue, Detroit, MI, 48202, USA
| | - Robert K Irwin
- Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, NG7 2RD, UK
| | | | - Geoffry Schrank
- Northrup Grumman Space Systems, 45101 Warp Drive, Sterling, VA, 20166, USA
| | | | | | - Michael J Barlow
- Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, NG7 2RD, UK
| | - Boyd M Goodson
- Department of Chemistry and Biochemistry, Southern Illinois University, 1245 Lincoln Drive, Carbondale, IL, 62901, USA
- Materials Technology Center, Southern Illinois University, 1245 Lincoln Drive, Carbondale, IL, 62901, USA
| | - Eduard Y Chekmenev
- Intergrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), 5101 Cass Avenue, Detroit, MI, 48202, USA
- Russian Academy of Sciences, Leninskiy Prospekt 14, Moscow, 119991, Russia
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Khan AS, Harvey RL, Birchall JR, Irwin RK, Nikolaou P, Schrank G, Emami K, Dummer A, Barlow MJ, Goodson BM, Chekmenev EY. Enabling Clinical Technologies for Hyperpolarized
129
Xenon Magnetic Resonance Imaging and Spectroscopy. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202015200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Alixander S. Khan
- Sir Peter Mansfield Imaging Centre University of Nottingham Nottingham NG7 2RD UK
| | - Rebecca L. Harvey
- Sir Peter Mansfield Imaging Centre University of Nottingham Nottingham NG7 2RD UK
| | - Jonathan R. Birchall
- Intergrative Biosciences (Ibio) Wayne State University, Karmanos Cancer Institute (KCI) 5101 Cass Avenue Detroit MI 48202 USA
| | - Robert K. Irwin
- Sir Peter Mansfield Imaging Centre University of Nottingham Nottingham NG7 2RD UK
| | | | - Geoffry Schrank
- Northrup Grumman Space Systems 45101 Warp Drive Sterling VA 20166 USA
| | | | | | - Michael J. Barlow
- Sir Peter Mansfield Imaging Centre University of Nottingham Nottingham NG7 2RD UK
| | - Boyd M. Goodson
- Department of Chemistry and Biochemistry Southern Illinois University 1245 Lincoln Drive Carbondale IL 62901 USA
- Materials Technology Center Southern Illinois University 1245 Lincoln Drive Carbondale IL 62901 USA
| | - Eduard Y. Chekmenev
- Intergrative Biosciences (Ibio) Wayne State University, Karmanos Cancer Institute (KCI) 5101 Cass Avenue Detroit MI 48202 USA
- Russian Academy of Sciences Leninskiy Prospekt 14 Moscow 119991 Russia
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Birchall JR, Irwin RK, Chowdhury MRH, Nikolaou P, Goodson BM, Barlow MJ, Shcherbakov A, Chekmenev EY. Automated Low-Cost In Situ IR and NMR Spectroscopy Characterization of Clinical-Scale 129Xe Spin-Exchange Optical Pumping. Anal Chem 2021; 93:3883-3888. [PMID: 33591160 DOI: 10.1021/acs.analchem.0c04545] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present on the utility of in situ nuclear magnetic resonance (NMR) and near-infrared (NIR) spectroscopic techniques for automated advanced analysis of the 129Xe hyperpolarization process during spin-exchange optical pumping (SEOP). The developed software protocol, written in the MATLAB programming language, facilitates detailed characterization of hyperpolarized contrast agent production efficiency based on determination of key performance indicators, including the maximum achievable 129Xe polarization, steady-state Rb-129Xe spin-exchange and 129Xe polarization build-up rates, 129Xe spin-relaxation rates, and estimates of steady-state Rb electron polarization. Mapping the dynamics of 129Xe polarization and relaxation as a function of SEOP temperature enables systematic optimization of the batch-mode SEOP process. The automated analysis of a typical experimental data set, encompassing ∼300 raw NMR and NIR spectra combined across six different SEOP temperatures, can be performed in under 5 min on a laptop computer. The protocol is designed to be robust in operation on any batch-mode SEOP hyperpolarizer device. In particular, we demonstrate the implementation of a combination of low-cost NIR and low-frequency NMR spectrometers (∼$1,100 and ∼$300 respectively, ca. 2020) for use in the described protocols. The demonstrated methodology will aid in the characterization of NMR hyperpolarization hardware in the context of SEOP and other hyperpolarization techniques for more robust and less expensive clinical production of HP 129Xe and other contrast agents.
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Affiliation(s)
- Jonathan R Birchall
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, Michigan 48202, United States
| | - Robert K Irwin
- Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Md Raduanul H Chowdhury
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, Michigan 48202, United States
| | | | | | - Michael J Barlow
- Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Anton Shcherbakov
- Smart-A, Perm, Perm Region 614000, Russia.,Custom Medical Systems (CMS) LTD, Nicosia 2312, Cyprus
| | - Eduard Y Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, Michigan 48202, United States.,Russian Academy of Sciences, Leninskiy Prospekt 14, Moscow 119991, Russia
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Kunth M, Schröder L. Binding site exchange kinetics revealed through efficient spin-spin dephasing of hyperpolarized 129Xe. Chem Sci 2020; 12:158-169. [PMID: 34163587 PMCID: PMC8178811 DOI: 10.1039/d0sc04835f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Spin exchange between different chemical environments is an important observable for characterizing chemical exchange kinetics in various contexts, including protein folding, chelation chemistry, and host-guest interactions. Such spins experience effective spin-spin relaxation rate, R 2,eff, that typically shows a dispersive behavior which requires detailed analysis. Here, we describe a class of highly simplified R 2,eff behavior by relying on hyperpolarized 129Xe as a freely exchanging ligand reporter. It provides large chemical shift separations that yield reduced expressions of both the Swift-Connick and the Carver-Richards treatment of exchange-induced relaxation. Despite observing a diamagnetic system, R 2,eff is dominated by large Larmor frequency jumps and thus allows detection of otherwise inaccessible analyte concentrations with a single spin echo train (only 0.01% of the overall hyperpolarized spins need to be transiently bound to the molecule). The two Xe hosts cryptophane-A monoacid (CrA-ma) and cucurbit[6]uril (CB6) represent two exemplary families of container molecules (the latter one also serving as drug delivery vehicles) that act as highly efficient phase shifters for which we observed unprecedented exchange-induced relaxivity r 2 (up to 866 s-1 mM-1). By including methods of spatial encoding, multiple data points can be collected simultaneously to isolate the exchange contribution and determine the effective exchange rate in partially occupied binding sites with a single delivery of hyperpolarized nuclei. The relaxivity is directly related to the guest turnover in these systems and temperature-dependent measurements yield an activation energy of E A = 41 kJ mol-1 for Xe@CrA-ma from simple relaxometry analysis. The concept is transferable to many applications where Xe is known to exhibit large chemical shifts.
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Affiliation(s)
- Martin Kunth
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie im Forschungsverbund Berlin e.V. (FMP) Campus Berlin-Buch, Robert-Roessle-Str. 10 13125 Berlin Germany +49 30 94793 121
| | - Leif Schröder
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie im Forschungsverbund Berlin e.V. (FMP) Campus Berlin-Buch, Robert-Roessle-Str. 10 13125 Berlin Germany +49 30 94793 121
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Birchall JR, Irwin RK, Nikolaou P, Coffey AM, Kidd BE, Murphy M, Molway M, Bales LB, Ranta K, Barlow MJ, Goodson BM, Rosen MS, Chekmenev EY. XeUS: A second-generation automated open-source batch-mode clinical-scale hyperpolarizer. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2020; 319:106813. [PMID: 32932118 DOI: 10.1016/j.jmr.2020.106813] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 08/20/2020] [Accepted: 08/24/2020] [Indexed: 06/11/2023]
Abstract
We present a second-generation open-source automated batch-mode 129Xe hyperpolarizer (XeUS GEN-2), designed for clinical-scale hyperpolarized (HP) 129Xe production via spin-exchange optical pumping (SEOP) in the regimes of high Xe density (0.66-2.5 atm partial pressure) and resonant photon flux (~170 W, Δλ = 0.154 nm FWHM), without the need for cryo-collection typically employed by continuous-flow hyperpolarizers. An Arduino micro-controller was used for hyperpolarizer operation. Processing open-source software was employed to program a custom graphical user interface (GUI), capable of remote automation. The Arduino Integrated Development Environment (IDE) was used to design a variety of customized automation sequences such as temperature ramping, NMR signal acquisition, and SEOP cell refilling for increased reliability. A polycarbonate 3D-printed oven equipped with a thermo-electric cooler/heater provides thermal stability for SEOP for both binary (Xe/N2) and ternary (4He-containing) SEOP cell gas mixtures. Quantitative studies of the 129Xe hyperpolarization process demonstrate that near-unity polarization can be achieved in a 0.5 L SEOP cell. For example, %PXe of 93.2 ± 2.9% is achieved at 0.66 atm Xe pressure with polarization build-up rate constant γSEOP = 0.040 ± 0.005 min-1, giving a max dose equivalent ≈ 0.11 L/h 100% hyperpolarized, 100% enriched 129Xe; %PXe of 72.6 ± 1.4% is achieved at 1.75 atm Xe pressure with γSEOP of 0.041 ± 0.001 min-1, yielding a corresponding max dose equivalent of 0.27 L/h. Quality assurance studies on this device have demonstrated the potential to refill SEOP cells hundreds of times without significant losses in performance, with average %PXe = 71.7%, (standard deviation σP = 1.52%) and mean polarization lifetime T1 = 90.5 min, (standard deviation σT = 10.3 min) over the first ~200 gas mixture refills, with sufficient performance maintained across a further ~700 refills. These findings highlight numerous technological developments and have significant translational relevance for efficient production of gaseous HP 129Xe contrast agents for use in clinical imaging and bio-sensing techniques.
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Affiliation(s)
- Jonathan R Birchall
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, MI 48202, United States
| | - Robert K Irwin
- Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | | | - Aaron M Coffey
- Department of Radiology, Vanderbilt University Institute of Imaging Science (VUIIS), Nashville, TN 37232, United States
| | - Bryce E Kidd
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901, United States
| | - Megan Murphy
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901, United States
| | - Michael Molway
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901, United States
| | - Liana B Bales
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901, United States
| | - Kaili Ranta
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901, United States
| | - Michael J Barlow
- Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham NG7 2RD, United Kingdom
| | - Boyd M Goodson
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, IL 62901, United States; Materials Technology Center, Southern Illinois University, Carbondale, IL 62901, United States
| | - Matthew S Rosen
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, MA 02129, United States; Department of Physics, Harvard University, Cambridge, MA 02138, United States
| | - Eduard Y Chekmenev
- Department of Chemistry, Integrative Biosciences (Ibio), Wayne State University, Karmanos Cancer Institute (KCI), Detroit, MI 48202, United States; Russian Academy of Sciences, Leninskiy Prospekt 14, Moscow 119991, Russia.
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