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Wen J, An Y, Shao L, Yin L, Peng Z, Liu Y, Tian J, Du Y. Dual-channel end-to-end network with prior knowledge embedding for improving spatial resolution of magnetic particle imaging. Comput Biol Med 2024; 178:108783. [PMID: 38909446 DOI: 10.1016/j.compbiomed.2024.108783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 05/21/2024] [Accepted: 06/15/2024] [Indexed: 06/25/2024]
Abstract
Magnetic particle imaging (MPI) is an emerging non-invasive medical imaging tomography technology based on magnetic particles, with excellent imaging depth penetration, high sensitivity and contrast. Spatial resolution and signal-to-noise ratio (SNR) are key performance metrics for evaluating MPI, which are directly influenced by the gradient of the selection field (SF). Increasing the SF gradient can improve the spatial resolution of MPI, but will lead to a decrease in SNR. Deep learning (DL) methods may enable obtaining high-resolution images from low-resolution images to improve the MPI resolution under low gradient conditions. However, existing DL methods overlook the physical procedures contributing to the blurring of MPI images, resulting in low interpretability and hindering breakthroughs in resolution. To address this issue, we propose a dual-channel end-to-end network with prior knowledge embedding for MPI (DENPK-MPI) to effectively establish a latent mapping between low-gradient and high-gradient images, thus improving MPI resolution without compromising SNR. By seamlessly integrating MPI PSF with DL paradigm, DENPK-MPI leads to a significant improvement in spatial resolution performance. Simulation, phantom, and in vivo MPI experiments have collectively confirmed that our method can improve the resolution of low-gradient MPI images without sacrificing SNR, resulting in a decrease in full width at half maximum by 14.8%-23.8 %, and the accuracy of image reconstruction is 18.2 %-27.3 % higher than other DL methods. In conclusion, we propose a DL method that incorporates MPI prior knowledge, which can improve the spatial resolution of MPI without compromising SNR and possess improved biomedical application.
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Affiliation(s)
- Jiaxuan Wen
- CAS Key Laboratory of Molecular Imaging, Institute of Automation, Beijing, China; School of Artificial Intelligence, The University of Chinese Academy of Sciences, Beijing, China
| | - Yu An
- School of Engineering Medicine, Beihang University, Beijing, China; The Key Laboratory of Big Data-Based Precision Medicine (Beihang University), Ministry of Industry and Information Technology, Beijing, China
| | - Lizhi Shao
- CAS Key Laboratory of Molecular Imaging, Institute of Automation, Beijing, China; School of Artificial Intelligence, The University of Chinese Academy of Sciences, Beijing, China
| | - Lin Yin
- CAS Key Laboratory of Molecular Imaging, Institute of Automation, Beijing, China; School of Artificial Intelligence, The University of Chinese Academy of Sciences, Beijing, China
| | - Zhengyao Peng
- CAS Key Laboratory of Molecular Imaging, Institute of Automation, Beijing, China; School of Artificial Intelligence, The University of Chinese Academy of Sciences, Beijing, China
| | - Yanjun Liu
- School of Engineering Medicine, Beihang University, Beijing, China; The Key Laboratory of Big Data-Based Precision Medicine (Beihang University), Ministry of Industry and Information Technology, Beijing, China
| | - Jie Tian
- CAS Key Laboratory of Molecular Imaging, Institute of Automation, Beijing, China; School of Engineering Medicine, Beihang University, Beijing, China; The Key Laboratory of Big Data-Based Precision Medicine (Beihang University), Ministry of Industry and Information Technology, Beijing, China
| | - Yang Du
- CAS Key Laboratory of Molecular Imaging, Institute of Automation, Beijing, China; School of Artificial Intelligence, The University of Chinese Academy of Sciences, Beijing, China.
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2
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Nguyen MD, Deng L, Lee JM, Resendez KM, Fuller M, Hoijang S, Robles-Hernandez F, Chu CW, Litvinov D, Hadjiev VG, Xu S, Phan MH, Lee TR. Magnetic Tunability via Control of Crystallinity and Size in Polycrystalline Iron Oxide Nanoparticles. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2402940. [PMID: 39004867 DOI: 10.1002/smll.202402940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 06/04/2024] [Indexed: 07/16/2024]
Abstract
Iron oxide nanoparticles (IONPs) are widely used for biomedical applications due to their unique magnetic properties and biocompatibility. However, the controlled synthesis of IONPs with tunable particle sizes and crystallite/grain sizes to achieve desired magnetic functionalities across single-domain and multi-domain size ranges remains an important challenge. Here, a facile synthetic method is used to produce iron oxide nanospheres (IONSs) with controllable size and crystallinity for magnetic tunability. First, highly crystalline Fe3O4 IONSs (crystallite sizes above 24 nm) having an average diameter of 50 to 400 nm are synthesized with enhanced ferrimagnetic properties. The magnetic properties of these highly crystalline IONSs are comparable to those of their nanocube counterparts, which typically possess superior magnetic properties. Second, the crystallite size can be widely tuned from 37 to 10 nm while maintaining the overall particle diameter, thereby allowing precise manipulation from the ferrimagnetic to the superparamagnetic state. In addition, demonstrations of reaction scale-up and the proposed growth mechanism of the IONSs are presented. This study highlights the pivotal role of crystal size in controlling the magnetic properties of IONSs and offers a viable means to produce IONSs with magnetic properties desirable for wider applications in sensors, electronics, energy, environmental remediation, and biomedicine.
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Affiliation(s)
- Minh Dang Nguyen
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003, USA
| | - Liangzi Deng
- Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003, USA
| | - Jong Moon Lee
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003, USA
| | - Karla M Resendez
- Department of Biomedical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003, USA
| | - Maggie Fuller
- Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003, USA
| | - Supawitch Hoijang
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003, USA
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
| | | | - Ching-Wu Chu
- Department of Physics and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003, USA
| | - Dmitri Litvinov
- Department of Electrical and Computer Engineering, University of Houston, Houston, TX, 77204-5003, USA
| | - Viktor G Hadjiev
- Department of Mechanical Engineering and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003, USA
| | - Shoujun Xu
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003, USA
| | - Manh-Huong Phan
- Department of Physics, University of South Florida, Tampa, FL, 33620, USA
| | - T Randall Lee
- Department of Chemistry and the Texas Center for Superconductivity, University of Houston, Houston, TX, 77204-5003, USA
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Mohn F, Scheffler K, Ackers J, Weimer A, Wegner F, Thieben F, Ahlborg M, Vogel P, Graeser M, Knopp T. Characterization of the clinically approved MRI tracer resotran for magnetic particle imaging in a comparison study. Phys Med Biol 2024; 69:135014. [PMID: 38870999 DOI: 10.1088/1361-6560/ad5828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 06/13/2024] [Indexed: 06/15/2024]
Abstract
Objective.The availability of magnetic nanoparticles (MNPs) with medical approval for human intervention is fundamental to the clinical translation of magnetic particle imaging (MPI). In this work, we thoroughly evaluate and compare the magnetic properties of an magnetic resonance imaging (MRI) approved tracer to validate its performance for MPI in future human trials.Approach.We analyze whether the recently approved MRI tracer Resotran is suitable for MPI. In addition, we compare Resotran with the previously approved and extensively studied tracer Resovist, with Ferrotran, which is currently in a clinical phase III study, and with the tailored MPI tracer Perimag.Main results.Initial magnetic particle spectroscopy (MPS) measurements indicate that Resotran exhibits performance characteristics akin to Resovist, but below Perimag. We provide data on four different tracers using dynamic light scattering, transmission electron microscopy, vibrating sample magnetometry measurements, MPS to derive hysteresis, point spread functions, and a serial dilution, as well as system matrix based MPI measurements on a preclinical scanner (Bruker 25/20 FF), including reconstructed images.Significance.Numerous approved MNPs used as tracers in MRI lack the necessary magnetic properties essential for robust signal generation in MPI. The process of obtaining medical approval for dedicated MPI tracers optimized for signal performance is an arduous and costly endeavor, often only justifiable for companies with a well-defined clinical business case. Resotran is an approved tracer that has become available in Europe for MRI. In this work, we study the eligibility of Resotran for MPI in an effort to pave the way for human MPI trials.
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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
| | - Konrad Scheffler
- Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Justin Ackers
- Fraunhofer IMTE, Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering, Lübeck, Germany
| | - Agnes Weimer
- Fraunhofer IMTE, Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering, Lübeck, Germany
- Institute of Physical Chemistry, University of Hamburg, Hamburg, Germany
| | - Franz Wegner
- Institute for Interventional Radiology, University of Lübeck, Lübeck, Germany
| | - Florian Thieben
- Institute for Biomedical Imaging, Hamburg University of Technology, Hamburg, Germany
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Mandy Ahlborg
- Fraunhofer IMTE, Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering, Lübeck, Germany
| | - Patrick Vogel
- Department of Experimental Physics 5 (Biophysics), University of Würzburg, Würzburg, Germany
| | - Matthias Graeser
- Fraunhofer IMTE, Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering, Lübeck, Germany
- Institute of Medical Engineering, University of Lübeck, Lübeck, 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 IMTE, Fraunhofer Research Institution for Individualized and Cell-based Medical Engineering, Lübeck, Germany
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Rezaei B, Tay ZW, Mostufa S, Manzari ON, Azizi E, Ciannella S, Moni HEJ, Li C, Zeng M, Gómez-Pastora J, Wu K. Magnetic nanoparticles for magnetic particle imaging (MPI): design and applications. NANOSCALE 2024; 16:11802-11824. [PMID: 38809214 DOI: 10.1039/d4nr01195c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Recent advancements in medical imaging have brought forth various techniques such as magnetic resonance imaging (MRI), computed tomography (CT), positron emission tomography (PET), and ultrasound, each contributing to improved diagnostic capabilities. Most recently, magnetic particle imaging (MPI) has become a rapidly advancing imaging modality with profound implications for medical diagnostics and therapeutics. By directly detecting the magnetization response of magnetic tracers, MPI surpasses conventional imaging modalities in sensitivity and quantifiability, particularly in stem cell tracking applications. Herein, this comprehensive review explores the fundamental principles, instrumentation, magnetic nanoparticle tracer design, and applications of MPI, offering insights into recent advancements and future directions. Novel tracer designs, such as zinc-doped iron oxide nanoparticles (Zn-IONPs), exhibit enhanced performance, broadening MPI's utility. Spatial encoding strategies, scanning trajectories, and instrumentation innovations are elucidated, illuminating the technical underpinnings of MPI's evolution. Moreover, integrating machine learning and deep learning methods enhances MPI's image processing capabilities, paving the way for more efficient segmentation, quantification, and reconstruction. The potential of superferromagnetic iron oxide nanoparticle chains (SFMIOs) as new MPI tracers further advanced the imaging quality and expanded clinical applications, underscoring the promising future of this emerging imaging modality.
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Affiliation(s)
- Bahareh Rezaei
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - Zhi Wei Tay
- National Institute of Advanced Industrial Science and Technology (AIST), Health and Medical Research Institute, Tsukuba, Ibaraki 305-8564, Japan
| | - Shahriar Mostufa
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - Omid Nejati Manzari
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - Ebrahim Azizi
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - Stefano Ciannella
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA
| | - Hur-E-Jannat Moni
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA
| | - Changzhi Li
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - Minxiang Zeng
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX 79409, USA
| | | | - Kai Wu
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
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5
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Toomajian V, Tundo A, Ural EE, Greeson EM, Contag CH, Makela AV. Magnetic Particle Imaging Reveals that Iron-Labeled Extracellular Vesicles Accumulate in Brains of Mice with Metastases. ACS APPLIED MATERIALS & INTERFACES 2024; 16:30860-30873. [PMID: 38860682 PMCID: PMC11194773 DOI: 10.1021/acsami.4c04920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 05/27/2024] [Accepted: 05/29/2024] [Indexed: 06/12/2024]
Abstract
The incidence of breast cancer remains high worldwide and is associated with a significant risk of metastasis to the brain that can be fatal; this is due, in part, to the inability of therapeutics to cross the blood-brain barrier (BBB). Extracellular vesicles (EVs) have been found to cross the BBB and further have been used to deliver drugs to tumors. EVs from different cell types appear to have different patterns of accumulation and retention as well as the efficiency of bioactive cargo delivery to recipient cells in the body. Engineering EVs as delivery tools to treat brain metastases, therefore, will require an understanding of the timing of EV accumulation and their localization relative to metastatic sites. Magnetic particle imaging (MPI) is a sensitive and quantitative imaging method that directly detects superparamagnetic iron. Here, we demonstrate MPI as a novel tool to characterize EV biodistribution in metastatic disease after labeling EVs with superparamagnetic iron oxide (SPIO) nanoparticles. Iron-labeled EVs (FeEVs) were collected from iron-labeled parental primary 4T1 tumor cells and brain-seeking 4T1BR5 cells, followed by injection into the mice with orthotopic tumors or brain metastases. MPI quantification revealed that FeEVs were retained for longer in orthotopic mammary carcinomas compared to SPIOs. MPI signal due to iron could only be detected in brains of mice bearing brain metastases after injection of FeEVs, but not SPIOs, or FeEVs when mice did not have brain metastases. These findings indicate the potential use of EVs as a therapeutic delivery tool in primary and metastatic tumors.
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Affiliation(s)
- Victoria
A. Toomajian
- Institute
for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States
- Department
of Biomedical Engineering, Michigan State
University, East Lansing, Michigan 48824, United States
| | - Anthony Tundo
- Institute
for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States
| | - Evran E. Ural
- Institute
for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States
- Department
of Biomedical Engineering, Michigan State
University, East Lansing, Michigan 48824, United States
| | - Emily M. Greeson
- Institute
for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States
- Department
of Microbiology, Genetics & Immunology, Michigan State University, East
Lansing, Michigan 48824, United States
| | - Christopher H. Contag
- Institute
for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States
- Department
of Biomedical Engineering, Michigan State
University, East Lansing, Michigan 48824, United States
- Department
of Microbiology, Genetics & Immunology, Michigan State University, East
Lansing, Michigan 48824, United States
| | - Ashley V. Makela
- Institute
for Quantitative Health Science and Engineering, Michigan State University, East Lansing, Michigan 48824, United States
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6
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Pacheco MO, Gerzenshtein IK, Stoppel WL, Rinaldi-Ramos CM. Advances in Vascular Diagnostics using Magnetic Particle Imaging (MPI) for Blood Circulation Assessment. Adv Healthc Mater 2024:e2400612. [PMID: 38879782 DOI: 10.1002/adhm.202400612] [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: 02/17/2024] [Revised: 05/11/2024] [Indexed: 06/29/2024]
Abstract
Rapid and accurate assessment of conditions characterized by altered blood flow, cardiac blood pooling, or internal bleeding is crucial for diagnosing and treating various clinical conditions. While widely used imaging modalities such as magnetic resonance imaging (MRI), computed tomography (CT), and ultrasound offer unique diagnostic advantages, they fall short for specific indications due to limited penetration depth and prolonged acquisition times. Magnetic particle imaging (MPI), an emerging tracer-based technique, holds promise for blood circulation assessments, potentially overcoming existing limitations with reduction in background signals and high temporal and spatial resolution, below the millimeter scale. Successful imaging of blood pooling and impaired flow necessitates tracers with diverse circulation half-lives optimized for MPI signal generation. Recent MPI tracers show potential in imaging cardiovascular complications, vascular perforations, ischemia, and stroke. The impressive temporal resolution and penetration depth also position MPI as an excellent modality for real-time vessel perfusion imaging via functional MPI (fMPI). This review summarizes advancements in optimized MPI tracers for imaging blood circulation and analyzes the current state of pre-clinical applications. This work discusses perspectives on standardization required to transition MPI from a research endeavor to clinical implementation and explore additional clinical indications that may benefit from the unique capabilities of MPI.
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Affiliation(s)
- Marisa O Pacheco
- Chemical Engineering, University of Florida, Gainesville, FL, 32611, USA
| | | | - Whitney L Stoppel
- Chemical Engineering, University of Florida, Gainesville, FL, 32611, USA
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA
| | - Carlos M Rinaldi-Ramos
- Chemical Engineering, University of Florida, Gainesville, FL, 32611, USA
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, 32611, USA
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7
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Wang M, Wang Y, Fu Q. Magneto-optical nanosystems for tumor multimodal imaging and therapy in-vivo. Mater Today Bio 2024; 26:101027. [PMID: 38525310 PMCID: PMC10959709 DOI: 10.1016/j.mtbio.2024.101027] [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: 01/19/2024] [Revised: 03/11/2024] [Accepted: 03/13/2024] [Indexed: 03/26/2024] Open
Abstract
Multimodal imaging, which combines the strengths of two or more imaging modalities to provide complementary anatomical and molecular information, has emerged as a robust technology for enhancing diagnostic sensitivity and accuracy, as well as improving treatment monitoring. Moreover, the application of multimodal imaging in guiding precision tumor treatment can prevent under- or over-treatment, thereby maximizing the benefits for tumor patients. In recent years, several intriguing magneto-optical nanosystems with both magnetic and optical properties have been developed, leading to significant breakthroughs in the field of multimodal imaging and image-guided tumor therapy. These advancements pave the way for precise tumor medicine. This review summarizes various types of magneto-optical nanosystems developed recently and describes their applications as probes for multimodal imaging and agents for image-guided therapeutic interventions. Finally, future research and development prospects of magneto-optical nanosystems are discussed along with an outlook on their further applications in the biomedical field.
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Affiliation(s)
- Mengzhen Wang
- Institute for Translational Medicine, College of Medicine, Qingdao University, Qingdao, 266021, China
| | - Yin Wang
- Key Laboratory of Birth Regulation and Control Technology of National Health Commission of China, Maternal and Child Health Care Hospital of Shandong Province Affiliated to Qingdao University, Qingdao University, Jinan, 250014, China
- Institute for Translational Medicine, College of Medicine, Qingdao University, Qingdao, 266021, China
| | - Qinrui Fu
- Key Laboratory of Birth Regulation and Control Technology of National Health Commission of China, Maternal and Child Health Care Hospital of Shandong Province Affiliated to Qingdao University, Qingdao University, Jinan, 250014, China
- Institute for Translational Medicine, College of Medicine, Qingdao University, Qingdao, 266021, China
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8
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Tay Z, Kim HJ, Ho JS, Olivo M. A Magnetic Particle Imaging Approach for Minimally Invasive Imaging and Sensing With Implantable Bioelectronic Circuits. IEEE TRANSACTIONS ON MEDICAL IMAGING 2024; 43:1740-1752. [PMID: 38157469 DOI: 10.1109/tmi.2023.3348149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Minimally-invasive and biocompatible implantable bioelectronic circuits are used for long-term monitoring of physiological processes in the body. However, there is a lack of methods that can cheaply and conveniently image the device within the body while simultaneously extracting sensor information. Magnetic Particle Imaging (MPI) with zero background signal, high contrast, and high sensitivity with quantitative images is ideal for this challenge because the magnetic signal is not absorbed with increasing tissue depth and incurs no radiation dose. We show how to easily modify common implantable devices to be imaged by MPI by encapsulating and magnetically-coupling magnetic nanoparticles (SPIOs) to the device circuit. These modified implantable devices not only provide spatial information via MPI, but also couple to our handheld MPI reader to transmit sensor information by modulating harmonic signals from magnetic nanoparticles via switching or frequency-shifting with resistive or capacitive sensors. This paper provides proof-of-concept of an optimized MPI imaging technique for implantable devices to extract spatial information as well as other information transmitted by the implanted circuit (such as biosensing) via encoding in the magnetic particle spectrum. The 4D images present 3D position and a changing color tone in response to a variable biometric. Biophysical sensing via bioelectronic circuits that take advantage of the unique imaging properties of MPI may enable a wide range of minimally invasive applications in biomedicine and diagnosis.
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9
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Xie X, Zhai J, Zhou X, Guo Z, Lo PC, Zhu G, Chan KWY, Yang M. Magnetic Particle Imaging: From Tracer Design to Biomedical Applications in Vasculature Abnormality. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2306450. [PMID: 37812831 DOI: 10.1002/adma.202306450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/14/2023] [Indexed: 10/11/2023]
Abstract
Magnetic particle imaging (MPI) is an emerging non-invasive tomographic technique based on the response of magnetic nanoparticles (MNPs) to oscillating drive fields at the center of a static magnetic gradient. In contrast to magnetic resonance imaging (MRI), which is driven by uniform magnetic fields and projects the anatomic information of the subjects, MPI directly tracks and quantifies MNPs in vivo without background signals. Moreover, it does not require radioactive tracers and has no limitations on imaging depth. This article first introduces the basic principles of MPI and important features of MNPs for imaging sensitivity, spatial resolution, and targeted biodistribution. The latest research aiming to optimize the performance of MPI tracers is reviewed based on their material composition, physical properties, and surface modifications. While the unique advantages of MPI have led to a series of promising biomedical applications, recent development of MPI in investigating vascular abnormalities in cardiovascular and cerebrovascular systems, and cancer are also discussed. Finally, recent progress and challenges in the clinical translation of MPI are discussed to provide possible directions for future research and development.
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Affiliation(s)
- Xulin Xie
- Department of Precision Diagnostic and Therapeutic Technology, City University of Hong Kong Shenzhen Futian Research Institute, Shenzhen, 518057, China
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
| | - Jiao Zhai
- Department of Precision Diagnostic and Therapeutic Technology, City University of Hong Kong Shenzhen Futian Research Institute, Shenzhen, 518057, China
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
| | - Xiaoyu Zhou
- Department of Precision Diagnostic and Therapeutic Technology, City University of Hong Kong Shenzhen Futian Research Institute, Shenzhen, 518057, China
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
| | - Zhengjun Guo
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
- Department of Oncology, the Second Affiliated Hospital of Chongqing Medical University, Chongqing, 400010, China
| | - Pui-Chi Lo
- Department of Precision Diagnostic and Therapeutic Technology, City University of Hong Kong Shenzhen Futian Research Institute, Shenzhen, 518057, China
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
| | - Guangyu Zhu
- Department of Chemistry, City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Kannie W Y Chan
- Department of Biomedical Engineering, City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Mengsu Yang
- Department of Precision Diagnostic and Therapeutic Technology, City University of Hong Kong Shenzhen Futian Research Institute, Shenzhen, 518057, China
- Department of Biomedical Sciences, and Tung Biomedical Sciences Centre, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, 999077, China
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10
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Ilg P. Nonequilibrium response of magnetic nanoparticles to time-varying magnetic fields: Contributions from Brownian and Néel processes. Phys Rev E 2024; 109:034603. [PMID: 38632745 DOI: 10.1103/physreve.109.034603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 02/07/2024] [Indexed: 04/19/2024]
Abstract
Many technical and biomedical applications of magnetic nanoparticles rely on their response to time-varying magnetic fields. While well-established models exist for either immobile or thermally blocked nanoparticles, the intermediate regime where Brownian as well as Néel relaxation occur at the same time is less well explored. Here, we use an efficient model that allows us to study the nonlinear dynamics of individual magnetic nanoparticles in response to different time-varying magnetic fields over a broad range of field parameters, taking into account both relaxation mechanisms. We provide quasiexact solutions for the longitudinal dynamics as well as approximate formulas from dynamic mean-field theory. Our results are relevant, e.g., for magnetorelaxometry, magnetic fluid hyperthermia, and magnetic particle imaging. For these example applications, we show that the ratio of characteristic Brownian to Néel relaxation time can have a profound impact on characteristic response quantities, especially at large field strengths.
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Affiliation(s)
- Patrick Ilg
- School of Mathematical, Physical, and Computational Sciences, University of Reading, Reading RG6 6AX, United Kingdom
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11
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Nigam S, Mohapatra J, Makela AV, Hayat H, Rodriguez JM, Sun A, Kenyon E, Redman NA, Spence D, Jabin G, Gu B, Ashry M, Sempere LF, Mitra A, Li J, Chen J, Wei GW, Bolin S, Etchebarne B, Liu JP, Contag CH, Wang P. Shape Anisotropy-Governed High-Performance Nanomagnetosol for In Vivo Magnetic Particle Imaging of Lungs. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2305300. [PMID: 37735143 PMCID: PMC10842459 DOI: 10.1002/smll.202305300] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 08/24/2023] [Indexed: 09/23/2023]
Abstract
Caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), coronavirus disease 2019 (COVID-19) has shown extensive lung manifestations in vulnerable individuals, putting lung imaging and monitoring at the forefront of early detection and treatment. Magnetic particle imaging (MPI) is an imaging modality, which can bring excellent contrast, sensitivity, and signal-to-noise ratios to lung imaging for the development of new theranostic approaches for respiratory diseases. Advances in MPI tracers would offer additional improvements and increase the potential for clinical translation of MPI. Here, a high-performance nanotracer based on shape anisotropy of magnetic nanoparticles is developed and its use in MPI imaging of the lung is demonstrated. Shape anisotropy proves to be a critical parameter for increasing signal intensity and resolution and exceeding those properties of conventional spherical nanoparticles. The 0D nanoparticles exhibit a 2-fold increase, while the 1D nanorods have a > 5-fold increase in signal intensity when compared to VivoTrax. Newly designed 1D nanorods displayed high signal intensities and excellent resolution in lung images. A spatiotemporal lung imaging study in mice revealed that this tracer offers new opportunities for monitoring disease and guiding intervention.
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Affiliation(s)
- Saumya Nigam
- Precision Health Program, Michigan State University, East Lansing, MI, 48824, USA
- Department of Radiology, College of Human Medicine, Michigan State University, East Lansing, MI, 48824, USA
| | - Jeotikanta Mohapatra
- Department of Physics, The University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Ashley V Makela
- Institute for Quantitative Health Science and Engineering (IQ), Michigan State University, East Lansing, MI, 48824, USA
- Department of Biomedical Engineering, College of Engineering, Michigan State University, East Lansing, MI, 48824, USA
| | - Hanaan Hayat
- Precision Health Program, Michigan State University, East Lansing, MI, 48824, USA
- Department of Radiology, College of Human Medicine, Michigan State University, East Lansing, MI, 48824, USA
| | - Jessi Mercedes Rodriguez
- Precision Health Program, Michigan State University, East Lansing, MI, 48824, USA
- Department of Radiology, College of Human Medicine, Michigan State University, East Lansing, MI, 48824, USA
- Human Biology Program, College of Natural Science, Michigan State University, East Lansing, MI, 48824, USA
| | - Aixia Sun
- Precision Health Program, Michigan State University, East Lansing, MI, 48824, USA
- Department of Radiology, College of Human Medicine, Michigan State University, East Lansing, MI, 48824, USA
| | - Elizabeth Kenyon
- Precision Health Program, Michigan State University, East Lansing, MI, 48824, USA
- Department of Radiology, College of Human Medicine, Michigan State University, East Lansing, MI, 48824, USA
| | - Nathan A Redman
- Institute for Quantitative Health Science and Engineering (IQ), Michigan State University, East Lansing, MI, 48824, USA
- Department of Biomedical Engineering, College of Engineering, Michigan State University, East Lansing, MI, 48824, USA
| | - Dana Spence
- Institute for Quantitative Health Science and Engineering (IQ), Michigan State University, East Lansing, MI, 48824, USA
- Department of Biomedical Engineering, College of Engineering, Michigan State University, East Lansing, MI, 48824, USA
| | - George Jabin
- Department of Physics, The University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Bin Gu
- Department of Obstetrics, Gynecology and Reproductive Sciences, College of Human Medicine, Michigan State University, East Lansing, MI, 48824, USA
| | - Mohamed Ashry
- Precision Health Program, Michigan State University, East Lansing, MI, 48824, USA
- Department of Radiology, College of Human Medicine, Michigan State University, East Lansing, MI, 48824, USA
| | - Lorenzo F Sempere
- Precision Health Program, Michigan State University, East Lansing, MI, 48824, USA
- Department of Radiology, College of Human Medicine, Michigan State University, East Lansing, MI, 48824, USA
| | - Arijit Mitra
- Department of Materials Science and Engineering, National Cheng Kung University, Tainan City, 701, Taiwan
| | - Jinxing Li
- Institute for Quantitative Health Science and Engineering (IQ), Michigan State University, East Lansing, MI, 48824, USA
- Department of Biomedical Engineering, College of Engineering, Michigan State University, East Lansing, MI, 48824, USA
| | - Jiahui Chen
- Department of Mathematics, College of Natural Science, Michigan State U, niversity, East Lansing, MI, 48824, USA
| | - Guo-Wei Wei
- Department of Mathematics, College of Natural Science, Michigan State U, niversity, East Lansing, MI, 48824, USA
- Department of Electrical and Computer Engineering, College of Engineering, Michigan State University, East Lansing, MI, 48824, USA
- Department of Biochemistry and Molecular Biology, College of Natural Science, Michigan State University, East Lansing, MI, 48824, USA
| | - Steven Bolin
- Department of Pathobiology and Diagnostic Investigation, College of Veterinary Medicine, Michigan State University, East Lansing, MI, 48824, USA
| | - Brett Etchebarne
- Osteopathic Medical Specialties, College of Osteopathic Medicine, Michigan State University, East Lansing, MI, 48824, USA
| | - J Ping Liu
- Department of Physics, The University of Texas at Arlington, Arlington, TX, 76019, USA
| | - Christopher H Contag
- Institute for Quantitative Health Science and Engineering (IQ), Michigan State University, East Lansing, MI, 48824, USA
- Department of Biomedical Engineering, College of Engineering, Michigan State University, East Lansing, MI, 48824, USA
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, 48824, USA
| | - Ping Wang
- Precision Health Program, Michigan State University, East Lansing, MI, 48824, USA
- Department of Radiology, College of Human Medicine, Michigan State University, East Lansing, MI, 48824, USA
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12
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Moya C, Escoda-Torroella M, Rodríguez-Álvarez J, Figueroa AI, García Í, Ferrer-Vidal IB, Gallo-Cordova A, Puerto Morales M, Aballe L, Fraile Rodríguez A, Labarta A, Batlle X. Unveiling the crystal and magnetic texture of iron oxide nanoflowers. NANOSCALE 2024; 16:1942-1951. [PMID: 38170857 DOI: 10.1039/d3nr04608g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Iron oxide nanoflowers (IONF) are densely packed multi-core aggregates known for their high saturation magnetization and initial susceptibility, as well as low remanence and coercive field. This study reports on how the local magnetic texture originating at the crystalline correlations among the cores determines the special magnetic properties of individual IONF over a wide size range from 40 to 400 nm. Regardless of this significant size variation in the aggregates, all samples exhibit a consistent crystalline correlation that extends well beyond the IONF cores. Furthermore, a nearly zero remnant magnetization, together with the presence of a persistently blocked state, and almost temperature-independent field-cooled magnetization, support the existence of a 3D magnetic texture throughout the IONF. This is confirmed by magnetic transmission X-ray microscopy images of tens of individual IONF, showing, in all cases, a nearly demagnetized state caused by the vorticity of the magnetic texture. Micromagnetic simulations agree well with these experimental findings, showing that the interplay between the inter-core direct exchange coupling and the demagnetizing field is responsible for the highly vortex-like spin configuration that stabilizes at low magnetic fields and appears to have partial topological protection. Overall, this comprehensive study provides valuable insights into the impact of crystalline texture on the magnetic properties of IONF over a wide size range, offering a deeper understanding of their potential applications in fields such as biomedicine and water remediation.
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Affiliation(s)
- Carlos Moya
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
- Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Mariona Escoda-Torroella
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
- Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Javier Rodríguez-Álvarez
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
- Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Adriana I Figueroa
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
- Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Íker García
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
| | - Inés Batalla Ferrer-Vidal
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
| | - A Gallo-Cordova
- Department of Nanoscience and Nanotechnology, Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain
| | - M Puerto Morales
- Department of Nanoscience and Nanotechnology, Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain
| | - Lucía Aballe
- ALBA Synchrotron Light Facility, CELLS, 08290 Barcelona, Spain
| | - Arantxa Fraile Rodríguez
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
- Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Amílcar Labarta
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
- Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
| | - Xavier Batlle
- Departament de Física de la Matèria Condensada, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain.
- Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, 08028 Barcelona, Spain
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13
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Velazquez-Albino AC, Nozka A, Melnyk A, Good HJ, Rinaldi-Ramos CM. Post-synthesis Oxidation of Superparamagnetic Iron Oxide Nanoparticles to Enhance Magnetic Particle Imaging Performance. ACS APPLIED NANO MATERIALS 2024; 7:279-291. [PMID: 38606282 PMCID: PMC11008578 DOI: 10.1021/acsanm.3c04442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
This study investigates the impact of post-synthesis oxidation on the performance of superparamagnetic iron oxide nanoparticles (SPIONs) in magnetic particle imaging (MPI), an emerging technology with applications in diagnostic imaging and theranostics. SPIONs synthesized from iron oleate were subjected to a post-synthesis oxidation treatment with a 1% Oxygen in Argon mixture. MPI performance, gauged via signal intensity and resolution using a MOMENTUM™ scanner, was correlated to the nanoparticles' physical and magnetic properties. Post-synthesis oxidation did not alter physical attributes like size and shape, but significantly enhanced magnetic properties. Saturation magnetization increased from 52% to 93% of the bulk value for magnetite, leading to better MPI performance in terms of signal intensity and resolution. However, the observed MPI performance did not fully align with predictions based on the ideal Langevin model, indicating the need for considering factors like relaxation and shape anisotropy. The findings underscore the potential of post-synthesis oxidation as a method to fine-tune magnetic properties of SPIONs and improve MPI performance, and the need for reproducible synthesis methods that afford finely tuned control of nanoparticle size, shape, and magnetic properties.
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Affiliation(s)
| | - Aniela Nozka
- Department of Bioengineering, Clemson University, Clemson, SC 29634
| | - Andrii Melnyk
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611
| | - Hayden J Good
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611
| | - Carlos M Rinaldi-Ramos
- Department of Chemical Engineering, University of Florida, Gainesville, FL 32611
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL 32611-6131
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14
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Bui TQ, Henn MA, Tew WL, Catterton MA, Woods SI. Harmonic dependence of thermal magnetic particle imaging. Sci Rep 2023; 13:15762. [PMID: 37737290 PMCID: PMC10516919 DOI: 10.1038/s41598-023-42620-1] [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: 05/15/2023] [Accepted: 09/12/2023] [Indexed: 09/23/2023] Open
Abstract
Advances in instrumentation and tracer materials are still required to enable sensitive, accurate, and localized in situ 3D temperature monitoring by magnetic particle imaging (MPI). We have developed a high-resolution magnetic particle imaging instrument and implemented a low-noise multi-harmonic lock-in detection method to observe and quantify temperature variations in iron oxide nanoparticle tracers using the harmonic ratio method for determining temperature. Using isolated harmonics for MPI and temperature imaging revealed an apparent dependence of imaging resolution on harmonic number. Thus, we present experimental and simulation studies to quantify the imaging resolution dependence on temperature and harmonic number, and directly validate the fundamental origin of MPI imaging resolution on harmonic number based on the concept of a harmonic point-spread-function.
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Affiliation(s)
- Thinh Q Bui
- National Institute of Standards and Technology, Gaithersburg, MD, 20895, USA.
| | - Mark-Alexander Henn
- National Institute of Standards and Technology, Gaithersburg, MD, 20895, USA
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA
| | - Weston L Tew
- National Institute of Standards and Technology, Gaithersburg, MD, 20895, USA
| | - Megan A Catterton
- National Institute of Standards and Technology, Gaithersburg, MD, 20895, USA
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, 21287, USA
| | - Solomon I Woods
- National Institute of Standards and Technology, Gaithersburg, MD, 20895, USA
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15
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Mason EE, Mattingly E, Herb K, Cauley SF, Śliwiak M, Drago JM, Graeser M, Mandeville ET, Mandeville JB, Wald LL. Functional magnetic particle imaging (fMPI) of cerebrovascular changes in the rat brain during hypercapnia. Phys Med Biol 2023; 68:175032. [PMID: 37531961 PMCID: PMC10461175 DOI: 10.1088/1361-6560/acecd1] [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: 05/18/2023] [Revised: 07/09/2023] [Accepted: 08/01/2023] [Indexed: 08/04/2023]
Abstract
Objective.Non-invasive functional brain imaging modalities are limited in number, each with its own complex trade-offs between sensitivity, spatial and temporal resolution, and the directness with which the measured signals reflect neuronal activation. Magnetic particle imaging (MPI) directly maps the cerebral blood volume (CBV), and its high sensitivity derives from the nonlinear magnetization of the superparamagnetic iron oxide nanoparticle (SPION) tracer confined to the blood pool. Our work evaluates functional MPI (fMPI) as a new hemodynamic functional imaging modality by mapping the CBV response in a rodent model where CBV is modulated by hypercapnic breathing manipulation.Approach.The rodent fMPI time-series data were acquired with a mechanically rotating field-free line MPI scanner capable of 5 s temporal resolution and 3 mm spatial resolution. The rat's CBV was modulated for 30 min with alternating 5 min hyper-/hypocapnic states, and processed using conventional fMRI tools. We compare our results to fMRI responses undergoing similar hypercapnia protocols found in the literature, and reinforce this comparison in a study of one rat with 9.4T BOLD fMRI using the identical protocol.Main results.The initial image in the time-series showed mean resting brain voxel SNR values, averaged across rats, of 99.9 following the first 10 mg kg-1SPION injection and 134 following the second. The time-series fit a conventional General Linear Model with a 15%-40% CBV change and a peak pixel CNR between 12 and 29, 2-6× higher than found in fMRI.Significance.This work introduces a functional modality with high sensitivity, although currently limited spatial and temporal resolution. With future clinical-scale development, a large increase in sensitivity could supplement other modalities and help transition functional brain imaging from a neuroscience tool focusing on population averages to a clinically relevant modality capable of detecting differences in individual patients.
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Affiliation(s)
- Erica E Mason
- A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States of America
| | - Eli Mattingly
- A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States of America
- Harvard-MIT Division of Health Sciences & Technology, Cambridge, MA, United States of America
- Harvard Medical School, Boston, MA, United States of America
| | - Konstantin Herb
- A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States of America
- ETH Zurich, Department of Physics, Zurich, Switzerland
| | - Stephen F Cauley
- A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States of America
- Harvard Medical School, Boston, MA, United States of America
| | - Monika Śliwiak
- A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States of America
| | - John M Drago
- A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States of America
- Harvard Medical School, Boston, MA, United States of America
- Massachusetts Institute of Technology, Department of Electrical Engineering & Computer Science, Cambridge, MA, United States of America
| | - Matthias Graeser
- Fraunhofer Research Institution for Individualized and Cell-Based Medical Engineering, IMTE, Lübeck, Germany
| | - Emiri T Mandeville
- A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States of America
- Harvard Medical School, Boston, MA, United States of America
| | - Joseph B Mandeville
- A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States of America
- Harvard Medical School, Boston, MA, United States of America
| | - Lawrence L Wald
- A. A. Martinos Center for Biomedical Imaging, Dept. of Radiology, Massachusetts General Hospital, Charlestown, MA, United States of America
- Harvard-MIT Division of Health Sciences & Technology, Cambridge, MA, United States of America
- Harvard Medical School, Boston, MA, United States of America
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16
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Charvátová H, Plichta Z, Hromádková J, Herynek V, Babič M. Hydrophilic Copolymers with Hydroxamic Acid Groups as a Protective Biocompatible Coating of Maghemite Nanoparticles: Synthesis, Physico-Chemical Characterization and MRI Biodistribution Study. Pharmaceutics 2023; 15:1982. [PMID: 37514168 PMCID: PMC10384990 DOI: 10.3390/pharmaceutics15071982] [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: 06/12/2023] [Accepted: 07/05/2023] [Indexed: 07/30/2023] Open
Abstract
Superparamagnetic iron oxide nanoparticles (SPION) with a "non-fouling" surface represent a versatile group of biocompatible nanomaterials valuable for medical diagnostics, including oncology. In our study we present a synthesis of novel maghemite (γ-Fe2O3) nanoparticles with positive and negative overall surface charge and their coating by copolymer P(HPMA-co-HAO) prepared by RAFT (reversible addition-fragmentation chain-transfer) copolymerization of N-(2-hydroxypropyl)methacrylamide (HPMA) with N-[2-(hydroxyamino)-2-oxo-ethyl]-2-methyl-prop-2-enamide (HAO). Coating was realized via hydroxamic acid groups of the HAO comonomer units with a strong affinity to maghemite. Dynamic light scattering (DLS) demonstrated high colloidal stability of the coated particles in a wide pH range, high ionic strength, and the presence of phosphate buffer (PBS) and serum albumin (BSE). Transmission electron microscopy (TEM) images show a narrow size distribution and spheroid shape. Alternative coatings were prepared by copolymerization of HPMA with methyl 2-(2-methylprop-2-enoylamino)acetate (MMA) and further post-polymerization modification with hydroxamic acid groups, carboxylic acid and primary-amino functionalities. Nevertheless, their colloidal stability was worse in comparison with P(HPMA-co-HAO). Additionally, P(HPMA-co-HAO)-coated nanoparticles were subjected to a bio-distribution study in mice. They were cleared from the blood stream by the liver relatively slowly, and their half-life in the liver depended on their charge; nevertheless, both cationic and anionic particles revealed a much shorter metabolic clearance rate than that of commercially available ferucarbotran.
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Affiliation(s)
- Hana Charvátová
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského Náměstí 2, 162 06 Prague, Czech Republic
| | - Zdeněk Plichta
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského Náměstí 2, 162 06 Prague, Czech Republic
| | - Jiřina Hromádková
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského Náměstí 2, 162 06 Prague, Czech Republic
| | - Vít Herynek
- Center for Advanced Preclinical Imaging (CAPI), First Faculty of Medicine, Charles University, Salmovská 3, 120 00 Prague, Czech Republic
| | - Michal Babič
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského Náměstí 2, 162 06 Prague, Czech Republic
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17
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Vogel P, Rückert MA, Greiner C, Günther J, Reichl T, Kampf T, Bley TA, Behr VC, Herz S. iMPI: portable human-sized magnetic particle imaging scanner for real-time endovascular interventions. Sci Rep 2023; 13:10472. [PMID: 37380707 DOI: 10.1038/s41598-023-37351-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Accepted: 06/20/2023] [Indexed: 06/30/2023] Open
Abstract
Minimally invasive endovascular interventions have become an important tool for the treatment of cardiovascular diseases such as ischemic heart disease, peripheral artery disease, and stroke. X-ray fluoroscopy and digital subtraction angiography are used to precisely guide these procedures, but they are associated with radiation exposure for patients and clinical staff. Magnetic Particle Imaging (MPI) is an emerging imaging technology using time-varying magnetic fields combined with magnetic nanoparticle tracers for fast and highly sensitive imaging. In recent years, basic experiments have shown that MPI has great potential for cardiovascular applications. However, commercially available MPI scanners were too large and expensive and had a small field of view (FOV) designed for rodents, which limited further translational research. The first human-sized MPI scanner designed specifically for brain imaging showed promising results but had limitations in gradient strength, acquisition time and portability. Here, we present a portable interventional MPI (iMPI) system dedicated for real-time endovascular interventions free of ionizing radiation. It uses a novel field generator approach with a very large FOV and an application-oriented open design enabling hybrid approaches with conventional X-ray-based angiography. The feasibility of a real-time iMPI-guided percutaneous transluminal angioplasty (PTA) is shown in a realistic dynamic human-sized leg model.
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Affiliation(s)
- P Vogel
- Department of Experimental Physics 5 (Biophysics), Julius-Maximilians-University Würzburg, Würzburg, Germany.
| | - M A Rückert
- Department of Experimental Physics 5 (Biophysics), Julius-Maximilians-University Würzburg, Würzburg, Germany
| | - C Greiner
- Department of Experimental Physics 5 (Biophysics), Julius-Maximilians-University Würzburg, Würzburg, Germany
| | - J Günther
- Department of Experimental Physics 5 (Biophysics), Julius-Maximilians-University Würzburg, Würzburg, Germany
| | - T Reichl
- Department of Experimental Physics 5 (Biophysics), Julius-Maximilians-University Würzburg, Würzburg, Germany
| | - T Kampf
- Department of Experimental Physics 5 (Biophysics), Julius-Maximilians-University Würzburg, Würzburg, Germany
- Department of Diagnostic and Interventional Neuroradiology, University Hospital Würzburg, Würzburg, Germany
| | - T A Bley
- Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Würzburg, Germany
| | - V C Behr
- Department of Experimental Physics 5 (Biophysics), Julius-Maximilians-University Würzburg, Würzburg, Germany
| | - S Herz
- Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Würzburg, Germany
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18
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Zheng X, Wu Y, Zuo H, Chen W, Wang K. Metal Nanoparticles as Novel Agents for Lung Cancer Diagnosis and Therapy. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2206624. [PMID: 36732908 DOI: 10.1002/smll.202206624] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 12/31/2022] [Indexed: 05/04/2023]
Abstract
Lung cancer is one of the most common malignancies worldwide and contributes to most cancer-related morbidity and mortality cases. During the past decades, the rapid development of nanotechnology has provided opportunities and challenges for lung cancer diagnosis and therapeutics. As one of the most extensively studied nanostructures, metal nanoparticles obtain higher satisfaction in biomedical applications associated with lung cancer. Metal nanoparticles have enhanced almost all major imaging strategies and proved great potential as sensor for detecting cancer-specific biomarkers. Moreover, metal nanoparticles could also improve therapeutic efficiency via better drug delivery, improved radiotherapy, enhanced gene silencing, and facilitated photo-driven treatment. Herein, the recently advanced metal nanoparticles applied in lung cancer therapy and diagnosis are summarized. Future perspective on the direction of metal-based nanomedicine is also discussed. Stimulating more research interests to promote the development of metal nanoparticles in lung cancer is devoted.
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Affiliation(s)
- Xinjie Zheng
- Department of Respiratory Medicine, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, 322000, China
| | - Yuan Wu
- Department of Respiratory Medicine, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, 322000, China
| | - Huali Zuo
- Department of Respiratory Medicine, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, 322000, China
| | - Weiyu Chen
- Department of Respiratory Medicine, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, 322000, China
- International Institutes of Medicine, The Fourth Affiliated Hospital of Zhejiang University School of Medicine, Yiwu, Zhejiang, 322000, China
| | - Kai Wang
- Department of Respiratory Medicine, The Fourth Affiliated Hospital, Zhejiang University School of Medicine, Yiwu, Zhejiang, 322000, China
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19
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Magnetic Particle Imaging in Vascular Imaging, Immunotherapy, Cell Tracking, and Noninvasive Diagnosis. Mol Imaging 2023. [DOI: 10.1155/2023/4131117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023] Open
Abstract
Magnetic particle imaging (MPI) is a new tracer-based imaging modality that is useful in diagnosing various pathophysiology related to the vascular system and for sensitive tracking of cytotherapies. MPI uses nonradioactive and easily assimilated nanometer-sized iron oxide particles as tracers. MPI images the nonlinear Langevin behavior of the iron oxide particles and has allowed for the sensitive detection of iron oxide-labeled therapeutic cells in the body. This review will provide an overview of MPI technology, the tracer, and its use in vascular imaging and cytotherapies using molecular targets.
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20
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Fung KLB, Colson C, Bryan J, Saayujya C, Mokkarala-Lopez J, Hartley A, Yousuf K, Kuo R, Lu Y, Fellows BD, Chandrasekharan P, Conolly SM. First Superferromagnetic Remanence Characterization and Scan Optimization for Super-Resolution Magnetic Particle Imaging. NANO LETTERS 2023; 23:1717-1725. [PMID: 36821385 PMCID: PMC10790312 DOI: 10.1021/acs.nanolett.2c04404] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Magnetic particle imaging (MPI) is a sensitive, high-contrast tracer modality that images superparamagnetic iron oxide nanoparticles, enabling radiation-free theranostic imaging. MPI resolution is currently limited by scanner and particle constraints. Recent tracers have experimentally shown 10× resolution and signal improvements with dramatically sharper M-H curves. Experiments show a dependence on interparticle interactions, conforming to literature definitions of superferromagnetism. We thus call our tracers superferromagnetic iron oxide nanoparticles (SFMIOs). While SFMIOs provide excellent signal and resolution, they exhibit hysteresis with non-negligible remanence and coercivity. We provide the first quantitative measurements of SFMIO remanence decay and reformation using a novel multiecho pulse sequence. We characterize MPI scanning with remanence decay and coercivity and describe an SNR-optimized pulse sequence for SFMIOs under human electromagnetic safety limitations. The resolution from SFMIOs could enable clinical MPI with 10× reduced scanner selection fields, reducing hardware costs by up to 100×.
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Affiliation(s)
- K L Barry Fung
- UC Berkeley-UCSF Graduate Group in Bioengineering, University of California Berkeley and University of California San Francisco, https://bioegrad.berkeley.edu/
| | - Caylin Colson
- UC Berkeley-UCSF Graduate Group in Bioengineering, University of California Berkeley and University of California San Francisco, https://bioegrad.berkeley.edu/
| | - Jacob Bryan
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Chinmoy Saayujya
- Department of Electrical Engineering and Computer Sciences, University of California Berkeley, Berkeley, California 94720, United States
| | - Javier Mokkarala-Lopez
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Allison Hartley
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Khadija Yousuf
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Renesmee Kuo
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Yao Lu
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Benjamin D Fellows
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Prashant Chandrasekharan
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
| | - Steven M Conolly
- Department of Bioengineering, University of California Berkeley, Berkeley, California 94720, United States
- Department of Electrical Engineering and Computer Sciences, University of California Berkeley, Berkeley, California 94720, United States
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21
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Khorasani A, Shahbazi-Gahrouei D, Safari A. Recent Metal Nanotheranostics for Cancer Diagnosis and Therapy: A Review. Diagnostics (Basel) 2023; 13:diagnostics13050833. [PMID: 36899980 PMCID: PMC10000685 DOI: 10.3390/diagnostics13050833] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 02/17/2023] [Accepted: 02/20/2023] [Indexed: 02/24/2023] Open
Abstract
In recent years, there has been an increasing interest in using nanoparticles in the medical sciences. Today, metal nanoparticles have many applications in medicine for tumor visualization, drug delivery, and early diagnosis, with different modalities such as X-ray imaging, computed tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET), etc., and treatment with radiation. This paper reviews recent findings of recent metal nanotheranostics in medical imaging and therapy. The study offers some critical insights into using different types of metal nanoparticles in medicine for cancer detection and treatment purposes. The data of this review study were gathered from multiple scientific citation websites such as Google Scholar, PubMed, Scopus, and Web of Science up through the end of January 2023. In the literature, many metal nanoparticles are used for medical applications. However, due to their high abundance, low price, and high performance for visualization and treatment, nanoparticles such as gold, bismuth, tungsten, tantalum, ytterbium, gadolinium, silver, iron, platinum, and lead have been investigated in this review study. This paper has highlighted the importance of gold, gadolinium, and iron-based metal nanoparticles in different forms for tumor visualization and treatment in medical applications due to their ease of functionalization, low toxicity, and superior biocompatibility.
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Affiliation(s)
- Amir Khorasani
- Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran
| | - Daryoush Shahbazi-Gahrouei
- Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran
- Correspondence: ; Tel.: +98-31-37929095
| | - Arash Safari
- Department of Radiology, Ionizing and Non-Ionizing Radiation Protection Research Center (INIRPRC), School of Paramedical Sciences, Shiraz University of Medical Sciences, Shiraz 71439-14693, Iran
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22
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Vedarethinam V, Jeevanandam J, Acquah C, Danquah MK. Magnetic Nanoparticles for Protein Separation and Purification. Methods Mol Biol 2023; 2699:125-159. [PMID: 37646997 DOI: 10.1007/978-1-0716-3362-5_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Proteins are essential for various functions such as brain activity and muscle contraction in humans. Even though food is a source of proteins, the bioavailability of proteins in most foods is usually limited due to matrix interaction with other biomolecules. Thus, it is essential to extract these proteins and provide them as a nutraceutical supplement to maintain protein levels and avoid protein deficiency. Hence, protein purification and extraction from natural sources are highly significant in biomedical applications. Chromatography, crude mechanical disruption, use of extractive chemicals, and electrophoresis are some of the methods applied to isolate specific proteins. Even though these methods possess several advantages, they are unable to extract specific proteins with high purity. A suitable alternative is the use of nanoparticles, which can be beneficial in protein purification and extraction. Notably, magnetic iron and iron-based nanoparticles have been employed in protein extraction processes and can be reused via demagnetization due to their magnetic property, smaller size, morphology, high surface-to-volume ratio, and surface charge-mediated property. This chapter is a summary of various magnetic nanoparticles (MNPs) that can be used for the biomolecular separation of proteins.
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Affiliation(s)
- Vadanasundari Vedarethinam
- Med-X Research Institute, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Jaison Jeevanandam
- CQM - Centro de Química da Madeira, MMRG, Universidade da Madeira, Campus da Penteada, Funchal, Portugal
| | - Caleb Acquah
- Faculty of Health Sciences, University of Ottawa, Ottawa, ON, Canada
| | - Michael K Danquah
- Chemical Engineering Department, University of Tennessee, Chattanooga, TN, USA.
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23
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Jia G, Huang L, Wang Z, Liang X, Zhang Y, Zhang Y, Miao Q, Hu K, Li T, Wang Y, Xi L, Feng X, Hui H, Tian J. Gradient-Based Pulsed Excitation and Relaxation Encoding in Magnetic Particle Imaging. IEEE TRANSACTIONS ON MEDICAL IMAGING 2022; 41:3725-3733. [PMID: 35862339 DOI: 10.1109/tmi.2022.3193219] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Magnetic particle imaging (MPI) is a radiation-free vessel- and target-imaging modality that can sensitively detect nanoparticles. A static magnetic gradient field, referred to as a selection field, is required in MPI to provide a field-free region (FFR) for spatial encoding. The image resolution of MPI is closely related to the size of the FFR, which is determined by the selection field gradient amplitude. Because of the limitations of existing gradient coil hardware, the image resolution of MPI cannot satisfy the clinical requirements of human in vivo imaging. Pulsed excitation has been confirmed to improve the image resolution of MPI by breaking down the 'relaxation wall.' This work proposes the use of a pulsed waveform magnetic gradient from magnetic resonance imaging to further improve the image resolution of MPI. Through alignment of the gradient direction along the field-free line (FFL), each location on the FFL is able to have a unique excitation field strength that generates a specific relaxation-induced decay signal. Through excitation of nanoparticles on the FFL with many gradient profiles, a high-resolution, one-dimensional (1D) image can be reconstructed on the FFL. For larger magnetic nanoparticles, simulation results revealed that a pulsed excitation field with a greater flat portion generates a 1D bar pattern phantom image with a higher correlation and spatial resolution. With parallel FFL and gradient coil movements, high-resolution, two-dimensional (2D) Shepp-Logan phantom and brain vessel maps were reconstructed through repetition of the spatially resolved measurement of magnetic nanoparticles on the FFL.
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24
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Xu W, Li X, Chen R, Lin W, Yuan D, Geng D, Luo T, Zhang J, Wu L, Zhou W. Ordered Magnetic Cilia Array Induced by the Micro-cavity Effect for the In Situ Adjustable Pressure Sensor. ACS APPLIED MATERIALS & INTERFACES 2022; 14:38291-38301. [PMID: 35971645 DOI: 10.1021/acsami.2c08124] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Cilia are fundamental functional structures in natural biology. As the primary option of artificial cilia, magnetic cilia have been drawing extensive attention due to their excellent biocompatibility, sensitive response, and contactless actuation. However, most of the ordered magnetic cilia are fabricated by molds, suffering from high cost and low efficiency. In this paper, an ultrafast fabrication method of ordered cilia array using the micro-cavity inducing effect was proposed. With the impact of static and dynamic magnetic fields, the fine cilia were first formed in out-cavity area and then converged above cavities forming complete cilia structures. The mechanism of the micro-cavity inducing effect was further revealed. Finally, the ordered cilia array was used to develop the pressure sensor with variable stiffness, making the in situ adjustment of the sensor performance possible. The ordered cilia array was applied as a micro-mixer and largely improved the mixing efficiency for different mediums. The ordered cilia array also successfully served as the info carrier for rapid sub-encryption. This method allows the fast and controlled forming of ordered cilia arrays within 30 s, and the cilia structure can be adjusted in a large range of aspect ratios (1-9), providing an approach to large-scale producing the magnetic cilia for different applications.
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Affiliation(s)
- Wenjun Xu
- Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361101, P. R. China
| | - Xinying Li
- Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361101, P. R. China
| | - Rui Chen
- Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361101, P. R. China
| | - Weiming Lin
- Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361101, P. R. China
| | - Ding Yuan
- Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361101, P. R. China
| | - Da Geng
- Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361101, P. R. China
| | - Tao Luo
- Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361101, P. R. China
| | - Jinhui Zhang
- Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361101, P. R. China
| | - Linjing Wu
- Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361101, P. R. China
| | - Wei Zhou
- Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361101, P. R. China
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25
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Sharma A, Cressman E, Attaluri A, Kraitchman DL, Ivkov R. Current Challenges in Image-Guided Magnetic Hyperthermia Therapy for Liver Cancer. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2768. [PMID: 36014633 PMCID: PMC9414548 DOI: 10.3390/nano12162768] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 08/03/2022] [Accepted: 08/06/2022] [Indexed: 05/09/2023]
Abstract
For patients diagnosed with advanced and unresectable hepatocellular carcinoma (HCC), liver transplantation remains the best option to extend life. Challenges with organ supply often preclude liver transplantation, making palliative non-surgical options the default front-line treatments for many patients. Even with imaging guidance, success following treatment remains inconsistent and below expectations, so new approaches are needed. Imaging-guided thermal therapy interventions have emerged as attractive procedures that offer individualized tumor targeting with the potential for the selective targeting of tumor nodules without impairing liver function. Furthermore, imaging-guided thermal therapy with added standard-of-care chemotherapies targeted to the liver tumor can directly reduce the overall dose and limit toxicities commonly seen with systemic administration. Effectiveness of non-ablative thermal therapy (hyperthermia) depends on the achieved thermal dose, defined as time-at-temperature, and leads to molecular dysfunction, cellular disruption, and eventual tissue destruction with vascular collapse. Hyperthermia therapy requires controlled heat transfer to the target either by in situ generation of the energy or its on-target conversion from an external radiative source. Magnetic hyperthermia (MHT) is a nanotechnology-based thermal therapy that exploits energy dissipation (heat) from the forced magnetic hysteresis of a magnetic colloid. MHT with magnetic nanoparticles (MNPs) and alternating magnetic fields (AMFs) requires the targeted deposition of MNPs into the tumor, followed by exposure of the region to an AMF. Emerging modalities such as magnetic particle imaging (MPI) offer additional prospects to develop fully integrated (theranostic) systems that are capable of providing diagnostic imaging, treatment planning, therapy execution, and post-treatment follow-up on a single platform. In this review, we focus on recent advances in image-guided MHT applications specific to liver cancer.
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Affiliation(s)
- Anirudh Sharma
- Department of Radiation Oncology and Molecular Radiation Sciences, The Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
| | - Erik Cressman
- Department of Interventional Radiology, Division of Diagnostic Imaging, MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Anilchandra Attaluri
- Department of Mechanical Engineering, School of Science, Engineering, and Technology, The Pennsylvania State University, Middletown, PA 17057, USA
| | - Dara L. Kraitchman
- Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Robert Ivkov
- Department of Radiation Oncology and Molecular Radiation Sciences, The Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA
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26
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Yang X, Shao G, Zhang Y, Wang W, Qi Y, Han S, Li H. Applications of Magnetic Particle Imaging in Biomedicine: Advancements and Prospects. Front Physiol 2022; 13:898426. [PMID: 35846005 PMCID: PMC9285659 DOI: 10.3389/fphys.2022.898426] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Accepted: 05/16/2022] [Indexed: 01/09/2023] Open
Abstract
Magnetic particle imaging (MPI) is a novel emerging noninvasive and radiation-free imaging modality that can quantify superparamagnetic iron oxide nanoparticles tracers. The zero endogenous tissue background signal and short image scanning times ensure high spatial and temporal resolution of MPI. In the context of precision medicine, the advantages of MPI provide a new strategy for the integration of the diagnosis and treatment of diseases. In this review, after a brief explanation of the simplified theory and imaging system, we focus on recent advances in the biomedical application of MPI, including vascular structure and perfusion imaging, cancer imaging, the MPI guidance of magnetic fluid hyperthermia, the visual monitoring of cell and drug treatments, and intraoperative navigation. We finally optimize MPI in terms of the system and tracers, and present future potential biomedical applications of MPI.
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Affiliation(s)
- Xue Yang
- Beijing You’an Hospital, Capital Medical University, Beijing, China
| | | | - Yanyan Zhang
- Beijing You’an Hospital, Capital Medical University, Beijing, China
| | - Wei Wang
- Beijing You’an Hospital, Capital Medical University, Beijing, China
| | - Yu Qi
- Beijing You’an Hospital, Capital Medical University, Beijing, China
| | - Shuai Han
- Beijing You’an Hospital, Capital Medical University, Beijing, China
| | - Hongjun Li
- Beijing You’an Hospital, Capital Medical University, Beijing, China,*Correspondence: Hongjun Li,
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27
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Makela AV, Schott MA, Madsen CS, Greeson EM, Contag CH. Magnetic Particle Imaging of Magnetotactic Bacteria as Living Contrast Agents Is Improved by Altering Magnetosome Arrangement. NANO LETTERS 2022; 22:4630-4639. [PMID: 35686930 DOI: 10.1021/acs.nanolett.1c05042] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Superparamagnetic iron oxide nanoparticles (SPIONs) can be used as imaging agents to differentiate between normal and diseased tissue or track cell movement. Magnetic particle imaging (MPI) detects the magnetic properties of SPIONs, providing quantitative and sensitive image data. MPI performance depends on the size, structure, and composition of nanoparticles. Magnetotactic bacteria produce magnetosomes with properties similar to those of synthetic nanoparticles, and these can be modified by mutating biosynthetic genes. The use of Magnetospirillum gryphiswaldense, MSR-1 with a mamJ deletion, containing clustered magnetosomes instead of typical linear chains, resulted in improved MPI signal and resolution. Bioluminescent MSR-1 with the mamJ deletion were administered into tumor-bearing and healthy mice. In vivo bioluminescence imaging revealed the viability of MSR-1, and MPI detected signals in livers and tumors. The development of living contrast agents offers opportunities for imaging and therapy with multimodality imaging guiding development of these agents by tracking the location, viability, and resulting biological effects.
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Affiliation(s)
- Ashley V Makela
- Institute for Quantitative Health Science and Engineering, Michigan State University, 775 Woodlot Drive, East Lansing, Michigan 48824, United States
| | - Melissa A Schott
- Institute for Quantitative Health Science and Engineering, Michigan State University, 775 Woodlot Drive, East Lansing, Michigan 48824, United States
| | - Cody S Madsen
- Institute for Quantitative Health Science and Engineering, Michigan State University, 775 Woodlot Drive, East Lansing, Michigan 48824, United States
- Department of Biomedical Engineering, Michigan State University, East Lansing, Michigan 48824, United States
| | - Emily M Greeson
- Institute for Quantitative Health Science and Engineering, Michigan State University, 775 Woodlot Drive, East Lansing, Michigan 48824, United States
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan 48824, United States
| | - Christopher H Contag
- Institute for Quantitative Health Science and Engineering, Michigan State University, 775 Woodlot Drive, East Lansing, Michigan 48824, United States
- Department of Biomedical Engineering, Michigan State University, East Lansing, Michigan 48824, United States
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan 48824, United States
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28
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Shang Y, Liu J, Zhang L, Wu X, Zhang P, Yin L, Hui H, Tian J. Deep learning for improving the spatial resolution of magnetic particle imaging. Phys Med Biol 2022; 67. [PMID: 35533677 DOI: 10.1088/1361-6560/ac6e24] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Accepted: 05/09/2022] [Indexed: 11/11/2022]
Abstract
Objective.Magnetic particle imaging (MPI) is a new medical, non-destructive, imaging method for visualizing the spatial distribution of superparamagnetic iron oxide nanoparticles. In MPI, spatial resolution is an important indicator of efficiency; traditional techniques for improving the spatial resolution may result in higher costs, lower sensitivity, or reduced contrast.Approach.Therefore, we propose a deep-learning approach to improve the spatial resolution of MPI by fusing a dual-sampling convolutional neural network (FDS-MPI). An end-to-end model is established to generate high-spatial-resolution images from low-spatial-resolution images, avoiding the aforementioned shortcomings.Main results.We evaluate the performance of the proposed FDS-MPI model through simulation and phantom experiments. The results demonstrate that the FDS-MPI model can improve the spatial resolution by a factor of two.Significance.This significant improvement in MPI could facilitate the preclinical application of medical imaging modalities in the future.
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Affiliation(s)
- Yaxin Shang
- School of Computer and Information Technology, Beijing Jiaotong University, Beijing, 100069, People's Republic of China.,Beijing Key Laboratory of Molecular Imaging, Beijing, 100190, People's Republic of China.,CAS Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
| | - Jie Liu
- School of Computer and Information Technology, Beijing Jiaotong University, Beijing, 100069, People's Republic of China
| | - Liwen Zhang
- Beijing Key Laboratory of Molecular Imaging, Beijing, 100190, People's Republic of China.,CAS Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
| | - Xiangjun Wu
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Engineering Medicine, Beihang University, Beijing, 100083, People's Republic of China
| | - Peng Zhang
- School of Computer and Information Technology, Beijing Jiaotong University, Beijing, 100069, People's Republic of China
| | - Lin Yin
- Beijing Key Laboratory of Molecular Imaging, Beijing, 100190, People's Republic of China.,CAS Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China
| | - Hui Hui
- Beijing Key Laboratory of Molecular Imaging, Beijing, 100190, People's Republic of China.,CAS Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.,University of Chinese Academy of Sciences, Beijing, 100080, People's Republic of China
| | - Jie Tian
- Beijing Key Laboratory of Molecular Imaging, Beijing, 100190, People's Republic of China.,CAS Key Laboratory of Molecular Imaging, Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.,Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Engineering Medicine, Beihang University, Beijing, 100083, People's Republic of China.,Zhuhai Precision Medical Center, Zhuhai People's Hospital affiliated with Jinan University, Zhuhai, 519000, People's Republic of China
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29
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In silico assessment of electrophysiological neuronal recordings mediated by magnetoelectric nanoparticles. Sci Rep 2022; 12:8386. [PMID: 35589877 PMCID: PMC9120189 DOI: 10.1038/s41598-022-12303-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Accepted: 05/09/2022] [Indexed: 11/14/2022] Open
Abstract
Magnetoelectric materials hold untapped potential to revolutionize biomedical technologies. Sensing of biophysical processes in the brain is a particularly attractive application, with the prospect of using magnetoelectric nanoparticles (MENPs) as injectable agents for rapid brain-wide modulation and recording. Recent studies have demonstrated wireless brain stimulation in vivo using MENPs synthesized from cobalt ferrite (CFO) cores coated with piezoelectric barium titanate (BTO) shells. CFO–BTO core–shell MENPs have a relatively high magnetoelectric coefficient and have been proposed for direct magnetic particle imaging (MPI) of brain electrophysiology. However, the feasibility of acquiring such readouts has not been demonstrated or methodically quantified. Here we present the results of implementing a strain-based finite element magnetoelectric model of CFO–BTO core–shell MENPs and apply the model to quantify magnetization in response to neural electric fields. We use the model to determine optimal MENPs-mediated electrophysiological readouts both at the single neuron level and for MENPs diffusing in bulk neural tissue for in vivo scenarios. Our results lay the groundwork for MENP recording of electrophysiological signals and provide a broad analytical infrastructure to validate MENPs for biomedical applications.
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30
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Moor L, Scheibler S, Gerken L, Scheffler K, Thieben F, Knopp T, Herrmann IK, Starsich FHL. Particle interactions and their effect on magnetic particle spectroscopy and imaging. NANOSCALE 2022; 14:7163-7173. [PMID: 35343985 PMCID: PMC9119029 DOI: 10.1039/d1nr08402j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 03/19/2022] [Indexed: 06/14/2023]
Abstract
Signal stability is crucial for an accurate diagnosis via magnetic particle imaging (MPI). However, MPI-tracer nanoparticles frequently agglomerate during their in vivo applications leading to particle interactions altering the signal. Here, we investigate the influence of such magnetic coupling phenomena on the MPI signal. We prepared Zn0.4Fe2.6O4 nanoparticles by flame spray synthesis and controlled their inter-particle distance by varying SiO2 coating thickness. The silica shell affected the magnetic properties indicating stronger particle interactions for a smaller inter-particle distance. The SiO2-coated Zn0.4Fe2.6O4 outperformed the bare sample in magnetic particle spectroscopy (MPS) in terms of signal/noise, however, the shell thickness itself only weakly influenced the MPS signal. To investigate the importance of magnetic coupling effects in more detail, we benchmarked the MPS signal of the bare and SiO2-coated Zn-ferrites against commercially available PVP-coated Fe3O4 nanoparticles in water and PBS. PBS is known to destabilize nanoparticle colloids mimicking in vivo-like agglomeration. The bare and coated Zn-ferrites showed excellent signal stability, despite their agglomeration in PBS. We attribute this to their process-intrinsic aggregated morphology formed during their flame-synthesis, which generates an MPS signal only little affected by PBS. On the other hand, the MPS signal of commercial PVP-coated Fe3O4 strongly decreased in PBS compared to water, indicating strongly changed particle interactions. The relevance of this effect was further investigated in a human cell model. For PVP-coated Fe3O4, we detected a strong discrepancy between the particle concentration obtained from the MPS signal and the actual concentration determined via ICP-MS. The same trend was observed during their MPI analysis; while SiO2-coated Zn-ferrites could be precisely located in water and PBS, PVP-coated Fe3O4 could not be detected in PBS at all. This drastically limits the sensitivity and also general applicability of these commercial tracers for MPI and illustrates the advantages of our flame-made Zn-ferrites concerning signal stability and ultimately diagnostic accuracy.
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Affiliation(s)
- Lorena Moor
- Nanoparticle Systems Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zurich, Switzerland.
| | - Subas Scheibler
- Nanoparticle Systems Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zurich, Switzerland.
- Particles-Biology Interactions, Department Materials Meet Life, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Lukas Gerken
- Nanoparticle Systems Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zurich, Switzerland.
- Particles-Biology Interactions, Department Materials Meet Life, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Konrad Scheffler
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Lottestraße 55, 22529 Hamburg, Germany
- Institute for Biomedical Imaging, Hamburg University of Technology, Am Schwarzenberg-Campus 3, 21073 Hamburg, Germany
| | - Florian Thieben
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Lottestraße 55, 22529 Hamburg, Germany
- Institute for Biomedical Imaging, Hamburg University of Technology, Am Schwarzenberg-Campus 3, 21073 Hamburg, Germany
| | - Tobias Knopp
- Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, Lottestraße 55, 22529 Hamburg, Germany
- Institute for Biomedical Imaging, Hamburg University of Technology, Am Schwarzenberg-Campus 3, 21073 Hamburg, Germany
| | - Inge K Herrmann
- Nanoparticle Systems Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zurich, Switzerland.
- Particles-Biology Interactions, Department Materials Meet Life, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
| | - Fabian H L Starsich
- Nanoparticle Systems Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, 8092 Zurich, Switzerland.
- Particles-Biology Interactions, Department Materials Meet Life, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland
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31
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Harvell-Smith S, Tung LD, Thanh NTK. Magnetic particle imaging: tracer development and the biomedical applications of a radiation-free, sensitive, and quantitative imaging modality. NANOSCALE 2022; 14:3658-3697. [PMID: 35080544 DOI: 10.1039/d1nr05670k] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Magnetic particle imaging (MPI) is an emerging tracer-based modality that enables real-time three-dimensional imaging of the non-linear magnetisation produced by superparamagnetic iron oxide nanoparticles (SPIONs), in the presence of an external oscillating magnetic field. As a technique, it produces highly sensitive radiation-free tomographic images with absolute quantitation. Coupled with a high contrast, as well as zero signal attenuation at-depth, there are essentially no limitations to where that can be imaged within the body. These characteristics enable various biomedical applications of clinical interest. In the opening sections of this review, the principles of image generation are introduced, along with a detailed comparison of the fundamental properties of this technique with other common imaging modalities. The main feature is a presentation on the up-to-date literature for the development of SPIONs tailored for improved imaging performance, and developments in the current and promising biomedical applications of this emerging technique, with a specific focus on theranostics, cell tracking and perfusion imaging. Finally, we will discuss recent progress in the clinical translation of MPI. As signal detection in MPI is almost entirely dependent on the properties of the SPION employed, this work emphasises the importance of tailoring the synthetic process to produce SPIONs demonstrating specific properties and how this impacts imaging in particular applications and MPI's overall performance.
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Affiliation(s)
- Stanley Harvell-Smith
- Biophysics Group, Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK.
- UCL Healthcare Biomagnetic and Nanomaterials Laboratories, University College London, 21 Albemarle Street, London W1S 4BS, UK
| | - Le Duc Tung
- Biophysics Group, Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK.
- UCL Healthcare Biomagnetic and Nanomaterials Laboratories, University College London, 21 Albemarle Street, London W1S 4BS, UK
| | - Nguyen Thi Kim Thanh
- Biophysics Group, Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK.
- UCL Healthcare Biomagnetic and Nanomaterials Laboratories, University College London, 21 Albemarle Street, London W1S 4BS, UK
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Schier P, Liebl M, Steinhoff U, Wiekhorst F, Baumgarten D. Experimental demonstration of improved magnetorelaxometry imaging performance using optimized coil configurations. Med Phys 2022; 49:3361-3374. [PMID: 35253916 PMCID: PMC9311073 DOI: 10.1002/mp.15594] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Revised: 02/02/2022] [Accepted: 02/26/2022] [Indexed: 11/29/2022] Open
Abstract
Background Magnetorelaxometry imaging is an experimental imaging technique capable of reconstructing magnetic nanoparticle distributions inside a volume noninvasively and with high specificity. Thus, magnetorelaxometry imaging is a promising candidate for monitoring a number of therapeutical approaches that employ magnetic nanoparticles, such as magnetic drug targeting and magnetic hyperthermia, to guarantee their safety and efficacy. Prior to a potential clinical application of this imaging modality, it is necessary to optimize magnetorelaxometry imaging systems to produce reliable imaging results and to maximize the reconstruction accuracy of the magnetic nanoparticle distributions. Multiple optimization approaches were already applied throughout a number of simulation studies, all of which yielded increased imaging qualities compared to intuitively designed measurement setups. Purpose None of these simulative approaches was conducted in practice such that it still remains unclear if the theoretical results are achievable in an experimental setting. In this study, we demonstrate the technical feasibility and the increased reconstruction accuracy of optimized coil configurations in two distinct magnetorelaxometry setups. Methods The electromagnetic coil positions and radii of a cuboidal as well as a cylindrical magnetorelaxometry imaging setup are optimized by minimizing the system matrix condition numbers of their corresponding linear forward models. The optimized coil configurations are manufactured alongside with two regular coil grids. Magnetorelaxometry measurements of three cuboidal and four cylindrical magnetic nanoparticle phantoms are conducted, and the resulting reconstruction qualities of the optimized and the regular coil configurations are compared. Results The computed condition numbers of the optimized coil configurations are approximately one order of magnitude lower compared to the regular coil grids. The reconstruction results show that for both setups, every phantom is recovered more accurately by the optimized coil configurations compared to the regular coil grids. Additionally, the optimized coil configurations yield better signal qualities. Conclusions The presented experimental study provides a proof of the practicality and the efficacy of optimizing magnetorelaxometry imaging systems with respect to the condition numbers of their system matrices, previously only demonstrated in simulations. From the promising results of our study, we infer that the minimization of the system matrix condition number will also enable the practical optimization of other design parameters of magnetorelaxometry imaging setups (e.g., sensor configuration, coil currents, etc.) in order to improve the achievable reconstruction qualities even further, eventually paving the way towards clinical application of this imaging modality.
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Affiliation(s)
- Peter Schier
- Institute of Electrical and Biomedical Engineering UMIT ‐ Private University for Health Sciences Medical Informatics and Technology Hall in Tirol 6060 Austria
| | - Maik Liebl
- Physikalisch‐Technische Bundesanstalt (PTB) 10587 Berlin and 38116 Braunschweig Germany
| | - Uwe Steinhoff
- Physikalisch‐Technische Bundesanstalt (PTB) 10587 Berlin and 38116 Braunschweig Germany
| | - Frank Wiekhorst
- Physikalisch‐Technische Bundesanstalt (PTB) 10587 Berlin and 38116 Braunschweig Germany
| | - Daniel Baumgarten
- Institute of Electrical and Biomedical Engineering UMIT ‐ Private University for Health Sciences Medical Informatics and Technology Hall in Tirol 6060 Austria
- Institute of Biomedical Engineering and Informatics Technische Universität Ilmenau Ilmenau 98693 Germany
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Oberdick SD, Borchers JA, Krycka KL. Magnetic correlations of iron oxide nanoparticles as probed by polarized SANS in stretched magnetic nanoparticle-elastomer composites. APPLIED PHYSICS LETTERS 2022; 120:10.1063/5.0081922. [PMID: 36620127 PMCID: PMC9813909 DOI: 10.1063/5.0081922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 01/17/2022] [Indexed: 06/17/2023]
Abstract
We have investigated the magnetic correlations among 7 nm iron oxide nanoparticles embedded in stretched silicone elastomers using polarized Small Angle Neutron Scattering (SANS). The magnetic nanoparticle (MNP)-elastomer composite can be stretched during experiments, and macroscopic deformations cause rearrangement of the iron oxide particles on the nanoscale. Polarized neutrons can be used to nondestructively probe the arrangement of magnetic nanoparticles before and after stretching, so that the relationship between applied stress and nanoscale magnetization can be interrogated. We find that stretching the MNP-elastomer composite past a certain threshold dramatically changes the structural and magnetic morphology of the system. The unstretched sample is modeled well by ~40 nm clusters of ~7 nm particles arranged in a hard sphere packing with a "volume fraction" parameter of 0.3. After the sample is stretched 3× its original size, however, the scattering data can be modeled by smaller, 16 nm clusters with a higher volume fraction of 0.4. We suggest that the effect can be understood by considering a stretching transformation on FCC-like crystallites of iron oxide nanoparticles embedded in an elastomeric medium.
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Affiliation(s)
- S. D. Oberdick
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
- National Institute of Standards and Technology, Boulder, Colorado 80305, USA
| | - J. A. Borchers
- National Institute of Standards and Technology, NIST Center for Neutron Research, Gaithersburg, Maryland 20899, USA
| | - K. L. Krycka
- National Institute of Standards and Technology, NIST Center for Neutron Research, Gaithersburg, Maryland 20899, USA
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Bui TQ, Biacchi AJ, Dennis CL, Tew WL, Walker ARH, Woods SI. Advanced characterization of magnetization dynamics in iron oxide magnetic nanoparticle tracers. APPLIED PHYSICS LETTERS 2022; 120:10.1063/5.0077016. [PMID: 36590240 PMCID: PMC9805320 DOI: 10.1063/5.0077016] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 12/07/2021] [Indexed: 06/17/2023]
Abstract
Characterization of the magnetization dynamics of single-domain magnetic nanoparticles (MNPs) is important for magnetic particle imaging (MPI), magnetic resonance imaging (MRI), and emerging medical diagnostic/therapeutic technologies. Depending on particle size and temperature, nanoparticle magnetization relaxation time constants span from nanoseconds to seconds. In solution, relaxation occurs via coupled Brownian and Néel relaxation mechanisms. Even though their coexistence complicates analysis, the presence of two timescales presents opportunities for more direct control of magnetization behavior if the two processes can be understood, isolated, and tuned. Using high frequency coils and sample temperature tunability, we demonstrate unambiguous determination of the specific relaxation processes for iron oxide nanoparticles using both time and frequency domain techniques. Furthermore, we study the evolution of the fast dynamics at ≈ 10 nanosecond timescales, for magnetic field amplitudes relevant to MPI.
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Affiliation(s)
- Thinh Q. Bui
- Author to whom correspondence should be addressed:
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Anderson NR, Davidson J, Louie DR, Serantes D, Livesey KL. Simulating the Self-Assembly and Hysteresis Loops of Ferromagnetic Nanoparticles with Sticking of Ligands. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2870. [PMID: 34835635 PMCID: PMC8621003 DOI: 10.3390/nano11112870] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/21/2021] [Accepted: 10/26/2021] [Indexed: 01/26/2023]
Abstract
The agglomeration of ferromagnetic nanoparticles in a fluid is studied using nanoparticle-level Langevin dynamics simulations. The simulations have interdigitation and bridging between ligand coatings included using a computationally-cheap, phenomenological sticking parameter c. The interactions between ligand coatings are shown in this preliminary study to be important in determining the shapes of agglomerates that form. A critical size for the sticking parameter is estimated analytically and via the simulations and indicates where particle agglomerates transition from well-ordered (c is small) to disordered (c is large) shapes. Results are also presented for the hysteresis loops (magnetization versus applied field) for these particle systems in an oscillating magnetic field appropriate for hyperthermia applications. The results show that the clumping of particles has a significant effect on their macroscopic properties, with important consequences on applications. In particular, the work done by an oscillating field on the system has a nonmonotonic dependence on c.
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Affiliation(s)
- Nicholas R. Anderson
- UCCS Biofrontiers Center, University of Colorado at Colorado Springs, 1420 Austin Bluffs Parkway, Colorado Springs, CO 80918, USA; (N.R.A.); (J.D.); (D.R.L.); (D.S.)
| | - Jonathon Davidson
- UCCS Biofrontiers Center, University of Colorado at Colorado Springs, 1420 Austin Bluffs Parkway, Colorado Springs, CO 80918, USA; (N.R.A.); (J.D.); (D.R.L.); (D.S.)
| | - Dana R. Louie
- UCCS Biofrontiers Center, University of Colorado at Colorado Springs, 1420 Austin Bluffs Parkway, Colorado Springs, CO 80918, USA; (N.R.A.); (J.D.); (D.R.L.); (D.S.)
| | - David Serantes
- UCCS Biofrontiers Center, University of Colorado at Colorado Springs, 1420 Austin Bluffs Parkway, Colorado Springs, CO 80918, USA; (N.R.A.); (J.D.); (D.R.L.); (D.S.)
- Instituto de Investigacións Tecnolóxicas and Applied Physics Department, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
- Department of Physics, University of York, York YO10 5DD, UK
| | - Karen L. Livesey
- UCCS Biofrontiers Center, University of Colorado at Colorado Springs, 1420 Austin Bluffs Parkway, Colorado Springs, CO 80918, USA; (N.R.A.); (J.D.); (D.R.L.); (D.S.)
- School of Information and Physical Sciences, University of Newcastle, Callaghan, NSW 2308, Australia
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