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Mattingly E, Barksdale AC, Śliwiak M, Chacon-Caldera J, Mason EE, Wald LL. Open-source device for high sensitivity magnetic particle spectroscopy, relaxometry, and hysteresis loop tracing. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:063706. [PMID: 38921057 PMCID: PMC11210977 DOI: 10.1063/5.0191946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Accepted: 06/10/2024] [Indexed: 06/27/2024]
Abstract
Magnetic nanoparticles (MNPs) are used extensively across numerous disciples, with applications including Magnetic Particle Imaging (MPI), targeted hyperthermia, deep brain stimulation, immunoassays, and thermometry. The assessment of MNPs, especially those being designed for MPI, is performed with magnetic particle spectrometers, relaxometers, loop tracers, or similar devices. Despite the many applications and the need for particle assessment, there are few consolidated resources for designing or building such a MNP assessment system. Here, we describe the design and performance of an open-source device capable of spectroscopy, relaxometry, and loop tracing. We show example measurements from the device and quantify the detection sensitivity by measuring a dilution series of Synomag-D 70 nm (from 0.5 mg Fe/ml to 7 ng Fe/ml) with a 10 mT drive field at 23.8 kHz. The device measures 260 pg Fe with SNR = 1 and 1.3 ng at SNR = 5 in spectroscopy mode in under one second of measurement time. The system has a dynamic range of 60 μg to 260 pg Fe without changing the hardware configuration. As an example application, we characterize Synomag-D's relaxation time constant for drive fields 2-18 mT and compare the magnetization responses of two commonly used MNPs.
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Affiliation(s)
- E. Mattingly
- Massachusetts Institute of Technology, Health Sciences and Technology, Cambridge, Massachusetts 02139, USA
| | - A. C. Barksdale
- Massachusetts Institute of Technology, Electrical Engineering and Computer Science, Cambidge, Massachusetts 02139, USA
| | - M. Śliwiak
- Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, Massachusetts 02129, USA
| | - J. Chacon-Caldera
- Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, Massachusetts 02129, USA
| | - E. E. Mason
- Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, Massachusetts 02129, USA
| | - L. L. Wald
- Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, Massachusetts 02129, USA
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Mohn F, Förger F, Thieben F, Möddel M, Schmale I, Knopp T, Graeser M. Resonant inductive coupling network for human-sized magnetic particle imaging. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:044701. [PMID: 38557882 DOI: 10.1063/5.0192784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 03/07/2024] [Indexed: 04/04/2024]
Abstract
In magnetic particle imaging, a field-free region is maneuvered throughout the field of view using a time-varying magnetic field known as the drive-field. Human-sized systems operate the drive-field in the kHz range and generate it by utilizing strong currents that can rise to the kA range within a coil called the drive field generator. Matching and tuning between a power amplifier, a band-pass filter, and the drive-field generator is required. Here, for reasons of safety in future human scanners, a symmetrical topology and a transformer called an inductive coupling network are used. Our primary objectives are to achieve floating potentials to ensure patient safety while attaining high linearity and high gain for the resonant transformer. We present a novel systematic approach to the design of a loss-optimized resonant toroid with a D-shaped cross section, employing segmentation to adjust the inductance-to-resistance ratio while maintaining a constant quality factor. Simultaneously, we derive a specific matching condition for a symmetric transmit-receive circuit for magnetic particle imaging. The chosen setup filters the fundamental frequency and allows simultaneous signal transmission and reception. In addition, the decoupling of multiple drive field channels is discussed, and the primary side of the transformer is evaluated for maximum coupling and minimum stray field. Two prototypes were constructed, measured, decoupled, and compared to the derived theory and method-of-moment based simulations.
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Affiliation(s)
- Fabian Mohn
- Institute for Biomedical Imaging, Hamburg University of Technology, 21073 Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Fynn Förger
- Institute for Biomedical Imaging, Hamburg University of Technology, 21073 Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Florian Thieben
- Institute for Biomedical Imaging, Hamburg University of Technology, 21073 Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Martin Möddel
- Institute for Biomedical Imaging, Hamburg University of Technology, 21073 Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Ingo Schmale
- Philips GmbH Innovative Technologies, Research Laboratories, 22335 Hamburg, Germany
| | - Tobias Knopp
- Institute for Biomedical Imaging, Hamburg University of Technology, 21073 Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
- Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering, IMTE, 23562 Lübeck, Germany
| | - Matthias Graeser
- Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering, IMTE, 23562 Lübeck, Germany
- Institute of Medical Engineering, University of Lübeck, 23562 Lübeck, Germany
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3
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Mohn F, Exner M, Szwargulski P, Möddel M, Knopp T, Graeser M. Saline bolus for negative contrast perfusion imaging in magnetic particle imaging. Phys Med Biol 2023; 68:175026. [PMID: 37609892 DOI: 10.1088/1361-6560/ace309] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 06/29/2023] [Indexed: 08/24/2023]
Abstract
Objective.Magnetic particle imaging (MPI) is capable of high temporal resolution measurements of the spatial distribution of magnetic nanoparticles and therefore well suited for perfusion imaging, which is an important tool in medical diagnosis. Perfusion imaging in MPI usually requires a fresh bolus of tracer material to capture the key signal dynamics. Here, we propose a method to decouple the imaging sequence from the injection of additional tracer material, without further increasing the administered iron dose in the body with each image.Approach.A bolus of physiological saline solution without any particles (negative contrast) diminishes the steady-state concentration of a long-circulating tracer during passage. This depression in the measured concentration contributes to the required contrast dynamics. The presence of a long-circulating tracer is therefore a prerequisite to obtain the negative contrast. As a quantitative tracer based imaging method, the signal is linear in the tracer concentration for any location that contains nanoparticles and zero in the surrounding tissue which does not provide any intrinsic signal. After tracer injection, the concentration over time (positive contrast) can be utilized to calculate dynamic diagnostic parameters like perfusion parameters in vessels and organs. Every acquired perfusion image thus requires a new bolus of tracer with a sufficiently large iron dose to be visible above the background.Main results.Perfusion parameters are calculated based on the time response of the proposed negative bolus and compared to a positive bolus. Results from phantom experiments show that normalized signals from positive and negative boli are concurrent and deviations of calculated perfusion maps are low.Significance.Our method opens up the possibility to increase the total monitoring time of a future patient by utilizing a positive-negative contrast sequence, while minimizing the iron dose per acquired image.
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Affiliation(s)
- Fabian Mohn
- Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Miriam Exner
- Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany
| | - Patryk Szwargulski
- Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany
| | - Martin Möddel
- Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Tobias Knopp
- Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Fraunhofer Research Institution for Individualized and Cell-based Medicine, IMTE, Lübeck, Germany
| | - Matthias Graeser
- Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
- Fraunhofer Research Institution for Individualized and Cell-based Medicine, IMTE, Lübeck, Germany
- Institute for Medical Engineering, University of Lübeck, Lübeck, Germany
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4
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Soares G, Pinto L, Liebl M, Biasotti G, Prospero A, Stoppa E, Bakuzis A, Baffa O, Wiekhorst F, Miranda JRA. Quantitative imaging of magnetic nanoparticles in an unshielded environment using a large AC susceptibility array. J Biol Eng 2022; 16:25. [PMID: 36221096 PMCID: PMC9552418 DOI: 10.1186/s13036-022-00305-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2022] [Accepted: 09/26/2022] [Indexed: 11/29/2022] Open
Abstract
Background Non-invasive magnetic imaging techniques are necessary to assist magnetic nanoparticles in biomedical applications, mainly detecting their distribution inside the body. In Alternating Current Biosusceptometry (ACB), the magnetic nanoparticle's magnetization response under an oscillating magnetic field, which is applied through an excitation coil, is detected with a balanced detection coil system. Results We built a Multi-Channel ACB system (MC-ACB) containing nineteen pick-up coils and obtained 2D quantitative images of magnetic nanoparticle distributions by solving an inverse problem. We reconstructed the magnetic nanoparticles spatial distributions in a field of view of 14 × 14 cm2 with a spatial resolution of 2.0 cm and sensitivity in the milligram scale. A correlation coefficient between quantitative reconstructed and nominal magnetic nanoparticle distributions above 0.6 was found for all measurements. Conclusion Besides other interesting features such as sufficient large field of view dimension for mice and rat studies, portability, and the ability to assess the quantitative magnetic nanoparticles distributions in real-time, the MC-ACB system is a promising tool for quantitative imaging of magnetic nanoparticles distributions in real-time, offering an affordable setup for easy access in clinical or laboratory environments.
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Affiliation(s)
- Guilherme Soares
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587, Berlin, Germany. .,Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, 18618-689, Brazil.
| | - Leonardo Pinto
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, 18618-689, Brazil
| | - Maik Liebl
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587, Berlin, Germany
| | - Gabriel Biasotti
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, 18618-689, Brazil
| | - Andre Prospero
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, 18618-689, Brazil
| | - Erick Stoppa
- Biosciences Institute of Botucatu, São Paulo State University, Botucatu, São Paulo, 18618-689, Brazil
| | - Andris Bakuzis
- Institute of Physics, Federal University of Goiás, Goiânia, 74690-900, Brazil
| | - Oswaldo Baffa
- Faculty of Philosophy, Sciences and Letters at Ribeirão Preto, University of São Paulo, Ribeirão Preto, Sao Paulo, 14040-900, Brazil
| | - Frank Wiekhorst
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587, Berlin, Germany
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5
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Remmo A, Löwa N, Kosch O, Eberbeck D, Ludwig A, Kampen L, Grüttner C, Wiekhorst F. Cell Tracking by Magnetic Particle Imaging: Methodology for Labeling THP-1 Monocytes with Magnetic Nanoparticles for Cellular Imaging. Cells 2022; 11:cells11182892. [PMID: 36139467 PMCID: PMC9496715 DOI: 10.3390/cells11182892] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 09/12/2022] [Accepted: 09/14/2022] [Indexed: 11/16/2022] Open
Abstract
Magnetic particle imaging (MPI) is a noninvasive tomographic imaging modality for the quantitative visualization of magnetic nanoparticles (MNPs) with high temporal and spatial resolution. The general capability of MPI for cell tracking (e.g., monitoring living cells labeled with MNPs) has successfully been shown. MNPs in cell culture media are often subjected to structural and magnetic changes. In addition to the deteriorating reproducibility, this also complicates the systematic study of the relationship between the MNP properties and their cellular uptake for MPI. Here, we present a method for the preparation of magnetically labeled THP-1 (Tamm-Horsfall Protein-1) monocytes that are used in MPI cell tracking. The method development was performed using two different MPI tracers, which exhibited electrostatic and steric stabilizations, respectively. In the first step, the interaction between the MNPs and cell culture media was investigated and adjusted to ensure high structural and magnetic stability. Furthermore, the influences of the incubation time, MNP concentration used for cellular uptake, and individual preparation steps (e.g., the washing of cells) were systematically investigated. Finally, the success of the developed loading method was demonstrated by the MPI measurements. The presented systematic investigation of the factors that influence the MNP loading of cells will help to develop a reliable and reproducible method for MPI monocyte tracking for the early detection of inflammation in the future.
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Affiliation(s)
- Amani Remmo
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
- Correspondence:
| | - Norbert Löwa
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
| | - Olaf Kosch
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
| | - Dietmar Eberbeck
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
| | - Antje Ludwig
- Charité, Center for Cardiovascular Research (CCR), Berlin, Hessische Straße 3-4, 10115 Berlin, Germany
| | - Lena Kampen
- Charité, Center for Cardiovascular Research (CCR), Berlin, Hessische Straße 3-4, 10115 Berlin, Germany
| | - Cordula Grüttner
- Micromod Partikeltechnologie GmbH, Schillingallee 68, 18057 Rostock, Germany
| | - Frank Wiekhorst
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
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6
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Etemadi H, Buchanan JK, Kandile NG, Plieger PG. Iron Oxide Nanoparticles: Physicochemical Characteristics and Historical Developments to Commercialization for Potential Technological Applications. ACS Biomater Sci Eng 2021; 7:5432-5450. [PMID: 34786932 DOI: 10.1021/acsbiomaterials.1c00938] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Iron oxide nanoparticles (IONPs) have gained increasing attention in various biomedical and industrial sectors due to their physicochemical and magnetic properties. In the biomedical field, IONPs are being developed for enzyme/protein immobilization, magnetofection, cell labeling, DNA detection, and tissue engineering. However, in some established areas, such as magnetic resonance imaging (MRI), magnetic drug targeting (MDT), magnetic fluid hyperthermia (MFH), immunomagnetic separation (IMS), and magnetic particle imaging (MPI), IONPs have crossed from the research bench, received clinical approval, and have been commercialized. Additionally, in industrial sectors IONP-based fluids (ferrofluids) have been marketed in electronic and mechanical devices for some time. This review explores the historical evolution of IONPs to their current state in biomedical and industrial applications.
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Affiliation(s)
- Hossein Etemadi
- School of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North 4410, New Zealand
| | - Jenna K Buchanan
- School of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North 4410, New Zealand
| | - Nadia G Kandile
- Department of Chemistry, Faculty of Women, Ain Shams University, Heliopolis 11757, Cairo, Egypt
| | - Paul G Plieger
- School of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North 4410, New Zealand
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7
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2D Quantitative Imaging of Magnetic Nanoparticles by an AC Biosusceptometry Based Scanning Approach and Inverse Problem. SENSORS 2021; 21:s21217063. [PMID: 34770373 PMCID: PMC8587841 DOI: 10.3390/s21217063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/20/2021] [Accepted: 10/21/2021] [Indexed: 01/08/2023]
Abstract
The use of magnetic nanoparticles (MNPs) in biomedical applications requires the quantitative knowledge of their quantitative distribution within the body. AC Biosusceptometry (ACB) is a biomagnetic technique recently employed to detect MNPs in vivo by measuring the MNPs response when exposed to an alternate magnetic field. The ACB technique presents some interesting characteristics: non-invasiveness, low operational cost, high portability, and no need for magnetic shielding. ACB conventional methods until now provided only qualitative information about the MNPs’ mapping in small animals. We present a theoretical model and experimentally demonstrate the feasibility of ACB reconstructing 2D quantitative images of MNPs’ distributions. We employed an ACB single-channel scanning approach, measuring at 361 sensor positions, to reconstruct MNPs’ spatial distributions. For this, we established a discrete forward problem and solved the ACB system’s inverse problem. Thus, we were able to determine the positions and quantities of MNPs in a field of view of 5×5×1 cm3 with good precision and accuracy. The results show the ACB system’s capabilities to reconstruct the quantitative spatial distribution of MNPs with a spatial resolution better than 1 cm, and a sensitivity of 1.17 mg of MNPs fixed in gypsum. These results show the system’s potential for biomedical application of MNPs in several studies, for example, electrochemical-functionalized MNPs for cancer cell targeting, quantitative sensing, and possibly in vivo imaging.
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8
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Hildebrand S, Löwa N, Paysen H, Fratila RM, Reverte-Salisa L, Trakoolwilaiwan T, Niu Z, Kasparis G, Preuss SF, Kosch O, M de la Fuente J, Thanh NTK, Wiekhorst F, Pfeifer A. Quantification of Lipoprotein Uptake in Vivo Using Magnetic Particle Imaging and Spectroscopy. ACS NANO 2021; 15:434-446. [PMID: 33306343 DOI: 10.1021/acsnano.0c03229] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Lipids are a major source of energy for most tissues, and lipid uptake and storage is therefore crucial for energy homeostasis. So far, quantification of lipid uptake in vivo has primarily relied on radioactive isotope labeling, exposing human subjects or experimental animals to ionizing radiation. Here, we describe the quantification of in vivo uptake of chylomicrons, the primary carriers of dietary lipids, in metabolically active tissues using magnetic particle imaging (MPI) and magnetic particle spectroscopy (MPS). We show that loading artificial chylomicrons (ACM) with iron oxide nanoparticles (IONPs) enables rapid and highly sensitive post hoc detection of lipid uptake in situ using MPS. Importantly, by utilizing highly magnetic Zn-doped iron oxide nanoparticles (ZnMNPs), we generated ACM with MPI tracer properties superseding the current gold-standard, Resovist, enabling quantification of lipid uptake from whole-animal scans. We focused on brown adipose tissue (BAT), which dissipates heat and can consume a large part of nutrient lipids, as a model for tightly regulated and inducible lipid uptake. High BAT activity in humans correlates with leanness and improved cardiometabolic health. However, the lack of nonradioactive imaging techniques is an important hurdle for the development of BAT-centered therapies for metabolic diseases such as obesity and type 2 diabetes. Comparison of MPI measurements with iron quantification by inductively coupled plasma mass spectrometry revealed that MPI rivals the performance of this highly sensitive technique. Our results represent radioactivity-free quantification of lipid uptake in metabolically active tissues such as BAT.
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Affiliation(s)
- Staffan Hildebrand
- Institut für Pharmakologie und Toxikologie, Rheinische Friedrich-Wilhelms-Universität Bonn, Venusberg-Campus 1, 53127 Bonn, Germany
| | - Norbert Löwa
- 8.23 Metrology for Magnetic Nanoparticles, Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
| | - Hendrik Paysen
- 8.23 Metrology for Magnetic Nanoparticles, Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
| | - Raluca M Fratila
- INMA - Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
- Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Laia Reverte-Salisa
- Institut für Pharmakologie und Toxikologie, Rheinische Friedrich-Wilhelms-Universität Bonn, Venusberg-Campus 1, 53127 Bonn, Germany
| | - Thithawat Trakoolwilaiwan
- Biophysics Group, Department of Physics and Astronomy, University College London, London WC1E 6BT, U.K
- UCL Healthcare Biomagnetics Laboratories, 21 Albemarle Street, London W1S 4BS, U.K
| | - Zheming Niu
- Institut für Pharmakologie und Toxikologie, Rheinische Friedrich-Wilhelms-Universität Bonn, Venusberg-Campus 1, 53127 Bonn, Germany
| | - Georgios Kasparis
- Biophysics Group, Department of Physics and Astronomy, University College London, London WC1E 6BT, U.K
- UCL Healthcare Biomagnetics Laboratories, 21 Albemarle Street, London W1S 4BS, U.K
| | - Stephanie Franziska Preuss
- Institut für Pharmakologie und Toxikologie, Rheinische Friedrich-Wilhelms-Universität Bonn, Venusberg-Campus 1, 53127 Bonn, Germany
| | - Olaf Kosch
- 8.23 Metrology for Magnetic Nanoparticles, Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
| | - Jesus M de la Fuente
- INMA - Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
- Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Nguyen Thi Kim Thanh
- Biophysics Group, Department of Physics and Astronomy, University College London, London WC1E 6BT, U.K
- UCL Healthcare Biomagnetics Laboratories, 21 Albemarle Street, London W1S 4BS, U.K
| | - Frank Wiekhorst
- 8.23 Metrology for Magnetic Nanoparticles, Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
| | - Alexander Pfeifer
- Institut für Pharmakologie und Toxikologie, Rheinische Friedrich-Wilhelms-Universität Bonn, Venusberg-Campus 1, 53127 Bonn, Germany
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9
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Anik MI, Hossain MK, Hossain I, Mahfuz AMUB, Rahman MT, Ahmed I. Recent progress of magnetic nanoparticles in biomedical applications: A review. NANO SELECT 2021. [DOI: 10.1002/nano.202000162] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Muzahidul I. Anik
- Chemical Engineering University of Rhode Island Kingston Rhode Island 02881 USA
| | - M. Khalid Hossain
- Interdisciplinary Graduate School of Engineering Science Kyushu University Fukuoka 816–8580 Japan
- Atomic Energy Research Establishment Bangladesh Atomic Energy Commission Dhaka 1349 Bangladesh
| | - Imran Hossain
- Institute for Micromanufacturing Louisiana Tech University Ruston Louisiana 71270 USA
| | - A. M. U. B. Mahfuz
- Biotechnology and Genetic Engineering University of Development Alternative Dhaka 1209 Bangladesh
| | - M. Tayebur Rahman
- Materials Science and Engineering University of Rajshahi Rajshahi 6205 Bangladesh
| | - Isteaque Ahmed
- Chemical Engineering University of Cincinnati Cincinnati Ohio 45221 USA
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10
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Lu Y, Rivera-Rodriguez A, Tay ZW, Hensley D, Fung KLB, Colson C, Saayujya C, Huynh Q, Kabuli L, Fellows B, Chandrasekharan P, Rinaldi C, Conolly S. Combining magnetic particle imaging and magnetic fluid hyperthermia for localized and image-guided treatment. Int J Hyperthermia 2021; 37:141-154. [PMID: 33426994 DOI: 10.1080/02656736.2020.1853252] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Magnetic fluid hyperthermia (MFH) has been widely investigated as a treatment tool for cancer and other diseases. However, focusing traditional MFH to a tumor deep in the body is not feasible because the in vivo wavelength of 300 kHz very low frequency (VLF) excitation fields is longer than 100 m. Recently we demonstrated that millimeter-precision localized heating can be achieved by combining magnetic particle imaging (MPI) with MFH. In principle, real-time MPI imaging can also guide the location and dosing of MFH treatments. Hence, the combination of MPI imaging plus real time localized MPI-MFH could soon permit closed-loop high-resolution hyperthermia treatment. In this review, we will discuss the fundamentals of localized MFH (e.g. physics and biosafety limitations), hardware implementation, MPI real-time guidance, and new research directions on MPI-MFH. We will also discuss how the scale up to human-sized MPI-MFH scanners could proceed.
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Affiliation(s)
- Yao Lu
- Department of Bioengineering, University of California Berkeley, Berkeley, CA, USA
| | - Angelie Rivera-Rodriguez
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA
| | - Zhi Wei Tay
- Department of Bioengineering, University of California Berkeley, Berkeley, CA, USA
| | | | - K L Barry Fung
- Department of Bioengineering, University of California Berkeley, Berkeley, CA, USA
| | - Caylin Colson
- Department of Bioengineering, University of California Berkeley, Berkeley, CA, USA
| | - Chinmoy Saayujya
- Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA, USA
| | - Quincy Huynh
- Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA, USA
| | - Leyla Kabuli
- Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA, USA
| | - Benjamin Fellows
- Department of Bioengineering, University of California Berkeley, Berkeley, CA, USA
| | | | - Carlos Rinaldi
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA.,Department of Chemical Engineering, University of Florida, Gainesville, FL, USA
| | - Steven Conolly
- Department of Bioengineering, University of California Berkeley, Berkeley, CA, USA.,Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA, USA
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11
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Wu K, Saha R, Su D, Krishna VD, Liu J, Cheeran MCJ, Wang JP. Magnetic-Nanosensor-Based Virus and Pathogen Detection Strategies before and during COVID-19. ACS APPLIED NANO MATERIALS 2020; 3:9560-9580. [PMID: 37556271 PMCID: PMC7526334 DOI: 10.1021/acsanm.0c02048] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 09/22/2020] [Indexed: 05/02/2023]
Abstract
The novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which causes coronavirus disease 2019 (COVID-19), is a threat to the global healthcare system and economic security. As of July 2020, no specific drugs or vaccines are yet available for COVID-19; a fast and accurate diagnosis for SARS-CoV-2 is essential in slowing the spread of COVID-19 and for efficient implementation of control and containment strategies. Magnetic nanosensing is an emerging topic representing the frontiers of current biosensing and magnetic areas. The past decade has seen rapid growth in applying magnetic tools for biological and biomedical applications. Recent advances in magnetic nanomaterials and nanotechnologies have transformed current diagnostic methods to nanoscale and pushed the detection limit to early-stage disease diagnosis. Herein, this review covers the literature of magnetic nanosensors for virus and pathogen detection before COVID-19. We review popular magnetic nanosensing techniques including magnetoresistance, magnetic particle spectroscopy, and nuclear magnetic resonance. Magnetic point-of-care diagnostic kits are also reviewed aiming at developing plug-and-play diagnostics to manage the SARS-CoV-2 outbreak as well as preventing future epidemics. In addition, other platforms that use magnetic nanomaterials as auxiliary tools for enhanced pathogen and virus detection are also covered. The goal of this review is to inform the researchers of diagnostic and surveillance platforms for SARS-CoV-2 and their performances.
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Affiliation(s)
- Kai Wu
- Department of Electrical and Computer
Engineering, University of Minnesota,
Minneapolis, Minnesota 55455, United States
| | - Renata Saha
- Department of Electrical and Computer
Engineering, University of Minnesota,
Minneapolis, Minnesota 55455, United States
| | - Diqing Su
- Department of Chemical Engineering and
Material Science, University of Minnesota,
Minneapolis, Minnesota 55455, United States
| | - Venkatramana D. Krishna
- Department of Veterinary Population
Medicine, University of Minnesota, St.
Paul, Minnesota 55108, United States
| | - Jinming Liu
- Department of Electrical and Computer
Engineering, University of Minnesota,
Minneapolis, Minnesota 55455, United States
| | - Maxim C.-J. Cheeran
- Department of Veterinary Population
Medicine, University of Minnesota, St.
Paul, Minnesota 55108, United States
| | - Jian-Ping Wang
- Department of Electrical and Computer
Engineering, University of Minnesota,
Minneapolis, Minnesota 55455, United States
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12
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Paysen H, Kosch O, Wells J, Loewa N, Wiekhorst F. Characterization of noise and background signals in a magnetic particle imaging system. Phys Med Biol 2020; 65. [PMID: 33086200 DOI: 10.1088/1361-6560/abc364] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 10/21/2020] [Indexed: 11/11/2022]
Abstract
Magnetic Particle Imaging (MPI) is a novel technology, which opens new possibilities for promising biomedical applications. MPI uses magnetic fields to generate a specific response from magnetic nanoparticles (MNPs), to determine their spatial location non-invasively and without using ionizing radiation. One open challenge of MPI is to achieve further improvements in terms of sensitivity to translate the currently preclinical performed research into clinical applications. In this work, we study the noise and background signals of our preclinical MPI system, to identify and characterize disturbing signal contributions. The current limit of detection achieved with our device was determined previously to be 20 ng of iron. Based on the results presented in this work, we describe possible hardware and software improvements and estimate that the limit of detection could be lowered to about 200-400 pg. Additionally, a long-term analysis of the scanner performance over the last three years is presented, which proved to be an easy and effective way to monitor possible changes or damage of hardware components. All the presented results were obtained by analysing empty scanner measurements and the presented methodology can easily be adapted for different scanner types, to compare their performances.
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Affiliation(s)
- Hendrik Paysen
- 8.2 Biosignals, Physikalisch-Technische Bundesanstalt in Berlin, Berlin, GERMANY
| | - Olaf Kosch
- 8.2 Biosignals, Physikalisch-Technische Bundesanstalt in Berlin, Berlin, Berlin, GERMANY
| | - James Wells
- 8.2 Biosignals, Physikalisch-Technische Bundesanstalt, Berlin, Berlin, GERMANY
| | - Norbert Loewa
- 8.2 Biosignals, Physikalisch-Technische Bundesanstalt, Berlin, Berlin, GERMANY
| | - Frank Wiekhorst
- 8.2 Biosignals, Physikalisch - Technische Bundesanstalt, Berlin, GERMANY
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13
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In vivo magnetic particle imaging: angiography of inferior vena cava and aorta in rats using newly developed multicore particles. Sci Rep 2020; 10:17247. [PMID: 33057029 PMCID: PMC7560824 DOI: 10.1038/s41598-020-74151-4] [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] [Received: 05/13/2020] [Accepted: 09/28/2020] [Indexed: 11/08/2022] Open
Abstract
Magnetic Particle Imaging (MPI) is a new imaging modality, which maps the distribution of magnetic nanoparticles (MNP) in 3D with high temporal resolution. It thus may be suited for cardiovascular imaging. Its sensitivity and spatial resolution critically depend on the magnetic properties of MNP. Therefore, we used novel multicore nanoparticles (MCP 3) for in-vivo MPI in rats and analyzed dose requirements, sensitivity and detail resolution. 8 rats were examined using a preclinical MPI scanner (Bruker Biospin GmbH, Germany) equipped with a separate receive coil. MCP 3 and Resovist were administered intravenously (i.v.) into the rats' tail veins at doses of 0.1, 0.05 and 0.025 mmol Fe/kg followed by serial MPI acquisition with a temporal resolution of 46 volumes per second. Based on a qualitative visual scoring system MCP 3-MPI images showed a significantly (P ≤ 0.05) higher image quality than Resovist-MPI images. Morphological features such as vessel lumen diameters (DL) of the inferior vena cava (IVC) and abdominal aorta (AA) could be assessed along a 2-cm segment in mesenteric area only after administration of MCP 3 at dosages of 0.1, 0.05 mmol Fe/kg. The mean DL ± SD estimated was 2.7 ± 0.6 mm for IVC and 2.4 ± 0.7 mm for AA. Evaluation of DL of the IVC and AA was not possible in Resovist-MPI images. Our results show, that MCP 3 provide better image quality at a lower dosage than Resovist. MCP 3-MPI with a clinically acceptable dose of 0.05 mmol Fe/kg increased the visibility of vessel lumens compared to Resovist-based MPI towards possible detection of vascular abnormalities such as stenosis or aneurysms, in vivo.
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14
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Wells J, Twamley S, Sekar A, Ludwig A, Paysen H, Kosch O, Wiekhorst F. Lissajous scanning magnetic particle imaging as a multifunctional platform for magnetic hyperthermia therapy. NANOSCALE 2020; 12:18342-18355. [PMID: 32869808 DOI: 10.1039/d0nr00604a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The use of engineered nanoscale magnetic materials in healthcare and biomedical technologies is rapidly growing. Two examples which have recently attracted significant attention are magnetic particle imaging (MPI) for biological monitoring, and magnetic field hyperthermia (MFH) for cancer therapy. Here for the first time, the capability of a Lissajous scanning MPI device to act as a standalone platform to support the application of MFH cancer treatment is presented. The platform is shown to offer functionalities for nanoparticle localization, focused hyperthermia therapy application, and non-invasive tissue thermometry in one device. Combined, these capabilities have the potential to significantly enhance the accuracy, effectiveness and safety of MFH therapy. Measurements of nanoparticle hyperthermia during protracted exposure to the MPI scanner's 3D imaging field sequence revealed spatially focused heating, with a maximum that is significantly enhanced compared with a simple 1-dimensional sinusoidal excitation. The observed spatial heating behavior is qualitatively described based on a phenomenological model considering torques exerted in the Brownian regime. In vitro cell studies using a human acute monocytic leukemia cell line (THP-1) demonstrated strong suppression of both structural integrity and metabolic activity within 24 h following a 40 min MFH treatment actuated within the Lissajous MPI scanner. Furthermore, reconstructed MPI images of the nanoparticles distributed among the cells, and the temperature-sensitivity of the MPI imaging signal obtained during treatment are demonstrated. In summary, combined Lissajous MPI and MFH technologies are presented; demonstrating for the first time their potential for cancer treatment with maximum effectiveness, and minimal collateral damage to surrounding tissues.
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Affiliation(s)
- James Wells
- Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany.
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15
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Mangarova DB, Brangsch J, Mohtashamdolatshahi A, Kosch O, Paysen H, Wiekhorst F, Klopfleisch R, Buchholz R, Karst U, Taupitz M, Schnorr J, Hamm B, Makowski MR. Ex vivo magnetic particle imaging of vascular inflammation in abdominal aortic aneurysm in a murine model. Sci Rep 2020; 10:12410. [PMID: 32709967 PMCID: PMC7381631 DOI: 10.1038/s41598-020-69299-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 06/26/2020] [Indexed: 01/06/2023] Open
Abstract
Abdominal aortic aneurysms (AAAs) are currently one of the leading causes of death in developed countries. Inflammation is crucial in the disease progression, having a substantial impact on various determinants in AAAs development. Magnetic particle imaging (MPI) is an innovative imaging modality, enabling the highly sensitive detection of magnetic nanoparticles (MNPs), suitable as surrogate marker for molecular targeting of vascular inflammation. For this study, Apolipoprotein E-deficient-mice underwent surgical implantation of osmotic minipumps with constant Angiotensin II infusion. After 3 and 4 weeks respectively, in-vivo-magnetic resonance imaging (MRI), ex-vivo-MPI and ex-vivo-magnetic particle spectroscopy (MPS) were performed. The results were validated by histological analysis, immunohistology and laser ablation-inductively coupled plasma-mass spectrometry. MR-angiography enabled the visualization of aneurysmal development and dilatation in the experimental group. A close correlation (R = 0.87) with histological area assessment was measured. Ex-vivo-MPS revealed abundant iron deposits in AAA samples and ex-vivo histopathology measurements were in good agreement (R = 0.76). Ex-vivo-MPI and MPS results correlated greatly (R = 0.99). CD68-immunohistology stain and Perls’-Prussian-Blue-stain confirmed the colocalization of macrophages and MNPs. This study demonstrates the feasibility of ex-vivo-MPI for detecting inflammation in AAA. The quantitative ability for mapping MNPs establishes MPI as a promising tool for monitoring inflammatory progression in AAA in an experimental setting.
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Affiliation(s)
- Dilyana B Mangarova
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany. .,Department of Veterinary Medicine, Institute of Veterinary Pathology, Freie Universität Berlin, Robert-von-Ostertag-Str. 15, Building 12, 14163, Berlin, Germany.
| | - Julia Brangsch
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany.,Department of Veterinary Medicine, Institute of Animal Welfare, Animal Behavior and Laboratory Animal Science, Freie Universität Berlin, Königsweg 67, Building 21, 14163, Berlin, Germany
| | - Azadeh Mohtashamdolatshahi
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Olaf Kosch
- Department 8.2-Biosignals, Physikalisch-Technische Bundesanstalt Berlin, Abbestrasse 2-12, 10587, Berlin, Germany
| | - Hendrik Paysen
- Department 8.2-Biosignals, Physikalisch-Technische Bundesanstalt Berlin, Abbestrasse 2-12, 10587, Berlin, Germany
| | - Frank Wiekhorst
- Department 8.2-Biosignals, Physikalisch-Technische Bundesanstalt Berlin, Abbestrasse 2-12, 10587, Berlin, Germany
| | - Robert Klopfleisch
- Department of Veterinary Medicine, Institute of Veterinary Pathology, Freie Universität Berlin, Robert-von-Ostertag-Str. 15, Building 12, 14163, Berlin, Germany
| | - Rebecca Buchholz
- Institute of Inorganic and Analytical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstr. 30, 48149, Münster, Germany
| | - Uwe Karst
- Institute of Inorganic and Analytical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstr. 30, 48149, Münster, Germany
| | - Matthias Taupitz
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Jörg Schnorr
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Bernd Hamm
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - Marcus R Makowski
- Department of Radiology, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany.,Department of Diagnostic and Interventional Radiology, Technische Universität München, Ismaninger Str. 22, 81675, Munich, Germany
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16
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Paysen H, Loewa N, Stach A, Wells J, Kosch O, Twamley S, Makowski MR, Schaeffter T, Ludwig A, Wiekhorst F. Cellular uptake of magnetic nanoparticles imaged and quantified by magnetic particle imaging. Sci Rep 2020; 10:1922. [PMID: 32024926 PMCID: PMC7002802 DOI: 10.1038/s41598-020-58853-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 01/21/2020] [Indexed: 01/24/2023] Open
Abstract
Magnetic particle imaging (MPI) is a non-invasive, non-ionizing imaging technique for the visualization and quantification of magnetic nanoparticles (MNPs). The technique is especially suitable for cell imaging as it offers zero background contribution from the surrounding tissue, high sensitivity, and good spatial and temporal resolutions. Previous studies have demonstrated that the dynamic magnetic behaviour of MNPs changes during cellular binding and internalization. In this study, we demonstrate how this information is encoded in the MPI imaging signal. Through MPI imaging we are able to discriminate between free and cell-bound MNPs in reconstructed images. This technique was used to image and quantify the changes that occur in-vitro when free MNPs come into contact with cells and undergo cellular-uptake over time. The quantitative MPI results were verified by colorimetric measurements of the iron content. The results showed a mean relative difference between the MPI results and the reference method of 23.8% for the quantification of cell-bound MNPs. With this technique, the uptake of MNPs in cells can be imaged and quantified directly from the first MNP cell contact, providing information on the dynamics of cellular uptake.
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Affiliation(s)
| | - Norbert Loewa
- Physikalisch-Technische Bundesanstalt, Berlin, Germany
| | - Anke Stach
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Medizinische Klinik für Kardiologie und Angiologie, Campus Mitte, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Berlin, Berlin, Germany
| | - James Wells
- Physikalisch-Technische Bundesanstalt, Berlin, Germany
| | - Olaf Kosch
- Physikalisch-Technische Bundesanstalt, Berlin, Germany
| | - Shailey Twamley
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Medizinische Klinik für Kardiologie und Angiologie, Campus Mitte, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Berlin, Berlin, Germany
| | - Marcus R Makowski
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Medizinische Klinik für Kardiologie und Angiologie, Campus Mitte, Berlin, Germany
- Technical University Munich, Munich, Germany
| | | | - Antje Ludwig
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Medizinische Klinik für Kardiologie und Angiologie, Campus Mitte, Berlin, Germany
- DZHK (German Centre for Cardiovascular Research), partner site Berlin, Berlin, Germany
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, Berlin Institute of Health, Klinik für Radiologie, Berlin, Germany
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17
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Kratz H, Mohtashamdolatshahi A, Eberbeck D, Kosch O, Hauptmann R, Wiekhorst F, Taupitz M, Hamm B, Schnorr J. MPI Phantom Study with A High-Performing Multicore Tracer Made by Coprecipitation. NANOMATERIALS 2019; 9:nano9101466. [PMID: 31623127 PMCID: PMC6835925 DOI: 10.3390/nano9101466] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 10/08/2019] [Accepted: 10/14/2019] [Indexed: 12/23/2022]
Abstract
Magnetic particle imaging (MPI) is a new imaging technique that detects the spatial distribution of magnetic nanoparticles (MNP) with the option of high temporal resolution. MPI relies on particular MNP as tracers with tailored characteristics for improvement of sensitivity and image resolution. For this reason, we developed optimized multicore particles (MCP 3) made by coprecipitation via synthesis of green rust and subsequent oxidation to iron oxide cores consisting of a magnetite/maghemite mixed phase. MCP 3 shows high saturation magnetization close to that of bulk maghemite and provides excellent magnetic particle spectroscopy properties which are superior to Resovist® and any other up to now published MPI tracers made by coprecipitation. To evaluate the MPI characteristics of MCP 3 two kinds of tube phantoms were prepared and investigated to assess sensitivity, spatial resolution, artifact severity, and selectivity. Resovist® was used as standard of comparison. For image reconstruction, the regularization factor was optimized, and the resulting images were investigated in terms of quantifying of volumes and iron content. Our results demonstrate the superiority of MCP 3 over Resovist® for all investigated MPI characteristics and suggest that MCP 3 is promising for future experimental in vivo studies.
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Affiliation(s)
- Harald Kratz
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
| | - Azadeh Mohtashamdolatshahi
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
| | | | - Olaf Kosch
- Physikalisch-Technische Bundesanstalt, D-10587 Berlin, Germany.
| | - Ralf Hauptmann
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
| | - Frank Wiekhorst
- Physikalisch-Technische Bundesanstalt, D-10587 Berlin, Germany.
| | - Matthias Taupitz
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
| | - Bernd Hamm
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
| | - Jörg Schnorr
- Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Radiology, D-10117 Berlin, Germany.
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