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Tavakkoli M, Svenningsen S, Friedlander Y, Konyer NB, Nair P, Noseworthy MD. Sampling pattern discrepancy in the application of compressed sensing hyperpolarized xenon-129 lung MRI. NMR IN BIOMEDICINE 2024; 37:e5121. [PMID: 38423986 DOI: 10.1002/nbm.5121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2023] [Revised: 01/14/2024] [Accepted: 01/23/2024] [Indexed: 03/02/2024]
Abstract
Although hyperpolarized (HP) 129Xe ventilation MRI can be carried out within a breath hold, it is still challenging for many sick patients. Compressed sensing (CS) is a viable alternative to accelerate this approach. However, undersampled images with identical sampling ratios differ from one another. Twenty subjects (n = 10 healthy and n = 10 patients with asthma) were scanned using a GE MR750 3 T scanner, acquiring fully sampled 2D multi-slice HP 129Xe lung ventilation images (10 s breath hold, 128 × 80 (FE × PE-frequency encoding × phase encoding) and 16 slices). Using fully sampled data, 500 variable-density Cartesian random undersampling patterns were generated, each at eight different sampling ratios from 10% to 80%. The parallel imaging and compressed sensing (PICS) command from BART was employed to reconstruct undersampled data. The signal to noise ratio (SNR), structural similarity index measurement (SSIM) and sidelobe to peak ratio of each were subsequently compared. There was a high degree of variation in both SNR and SSIM results from each of the 500 masks of each sampling rate. As the undersampling increases, there is more variation in the quantifying metrics, for both healthy and asthmatic individuals. Our study shows that random undersampling poses a significant challenge when applied at sampling ratios less than 60%, despite fulfilling CS's incoherency criteria. Such low sampling ratios will result in a large variety of undersampling patterns. Therefore, skipped segments of k-space cannot be allowed to happen randomly at low sampling rates. By optimizing the sampling pattern, CS will reach its full potential and be able to be applied to a highly undersampled 129Xe lung dataset.
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Affiliation(s)
- Mitra Tavakkoli
- Imaging Research Centre, St. Joseph's Healthcare Hamilton, Hamilton, Ontario, Canada
- Department of Electrical and Computer Engineering, McMaster University, Hamilton, Ontario, Canada
| | - Sarah Svenningsen
- Firestone Institute for Respiratory Health, St Joseph's Healthcare Hamilton, Hamilton, Ontario, Canada
- Department of Medicine, Division of Respirology, McMaster University, Hamilton, Ontario, Canada
- School of Biomedical Engineering, McMaster University, 1280 Main St W, Hamilton, Ontario, Canada
| | - Yonni Friedlander
- Firestone Institute for Respiratory Health, St Joseph's Healthcare Hamilton, Hamilton, Ontario, Canada
| | - Norman B Konyer
- Imaging Research Centre, St. Joseph's Healthcare Hamilton, Hamilton, Ontario, Canada
| | - Parameswaran Nair
- Firestone Institute for Respiratory Health, St Joseph's Healthcare Hamilton, Hamilton, Ontario, Canada
- Department of Medicine, Division of Respirology, McMaster University, Hamilton, Ontario, Canada
| | - Michael D Noseworthy
- Imaging Research Centre, St. Joseph's Healthcare Hamilton, Hamilton, Ontario, Canada
- Department of Electrical and Computer Engineering, McMaster University, Hamilton, Ontario, Canada
- School of Biomedical Engineering, McMaster University, 1280 Main St W, Hamilton, Ontario, Canada
- Department of Radiology, McMaster University, Hamilton, Ontario, Canada
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2
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Yildirim M, Kovalyk X, Scholtz P, Schütz M, Lindemeyer J, Lamerichs R, Grüll H, Isik EO. Fast 19 F spectroscopic imaging with pseudo-spiral k-space sampling. NMR IN BIOMEDICINE 2024; 37:e5086. [PMID: 38110293 DOI: 10.1002/nbm.5086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 10/30/2023] [Accepted: 11/19/2023] [Indexed: 12/20/2023]
Abstract
Fluorine MRI is finding wider acceptance in theranostics applications where imaging of 19 F hotspots of fluorinated contrast material is central. The essence of such applications is to capture ghosting-artifact-free images of the inherently low MR response under clinically viable conditions. To serve this purpose, this work introduces the balanced spiral spectroscopic imaging (BaSSI) sequence, which is implemented on a 3.0 T clinical scanner and is capable of generating 19 F hotspot images in an efficient manner. The sequence utilizes an all-phase-encoded pseudo-spiral k-space trajectory, enabling the acquisition of broadband (80 ppm) fluorine spectra free from chemical shift ghosting. BaSSI can acquire a 64 × 64 image with 1 mm × 1 mm voxels in just 14 s, significantly outperforming typical MRSI sequences used in 1 H or 31 P imaging. The study employed in silico characterization to verify essential design choices such as the excitation pulse, as well as to identify the boundaries of the parameter space explored for optimization. BaSSI's performance was further benchmarked against the 3D ultrashort-echo-time balanced steady-state free precession (3D UTE BSSFP) sequence, a well established method used in 19 F MRI, in vitro. Both sequences underwent extensive optimization through exploration of a wide parameter space on a small phantom containing 10 μL of non-diluted bulk perfluorooctylbromide (PFOB) prior to comparative experiments. Subsequent to optimization, BaSSI and 3D UTE BSSFP were employed to capture images of small non-diluted bulk PFOB samples (0.10 and 0.05 μL), with variations in the number of signal averages, and thus the total scan time, in order to assess the detection sensitivities of the sequences. In these experiments, the detection sensitivity was evaluated using the Rose criterion (Rc ), which provides a quantitative metric for assessing object visibility. The study further demonstrated BaSSI's utility as a (pre)clinical tool through postmortem imaging of polymer microspheres filled with PFOB in a BALB/c mouse. Anatomic localization of 19 F hotspots was achieved by denoising raw data obtained with BaSSI using a filter based on the Rose criterion. These data were then successfully registered to 1 H anatomical images. BaSSI demonstrated superior detection sensitivity in the benchmarking analysis, achieving Rc values approximately twice as high as those obtained with the 3D UTE BSSFP method. The technique successfully facilitated imaging and precise localization of 19 F hotspots in postmortem experiments. However, it is important to highlight that imaging 10 mM PFOB in small mice postmortem, utilizing a 48 × 48 × 48 3D scan, demanded a substantial scan time of 1 h and 45 min. Further studies will explore accelerated imaging techniques, such as compressed sensing, to enhance BaSSI's clinical utility.
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Affiliation(s)
- Muhammed Yildirim
- Institute of Biomedical Engineering, Bogazici University, Istanbul, Turkey
- Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany
| | - Xenia Kovalyk
- Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Cologne, Cologne, Germany
| | - Patrick Scholtz
- Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Cologne, Cologne, Germany
| | - Markus Schütz
- Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Cologne, Cologne, Germany
| | - Johannes Lindemeyer
- Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Cologne, Cologne, Germany
| | | | - Holger Grüll
- Institute of Diagnostic and Interventional Radiology, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Cologne, Cologne, Germany
| | - Esin Ozturk Isik
- Institute of Biomedical Engineering, Bogazici University, Istanbul, Turkey
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Maxouri O, Bodalal Z, Daal M, Rostami S, Rodriguez I, Akkari L, Srinivas M, Bernards R, Beets-Tan R. How to 19F MRI: applications, technique, and getting started. BJR Open 2023; 5:20230019. [PMID: 37953866 PMCID: PMC10636348 DOI: 10.1259/bjro.20230019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 07/26/2023] [Accepted: 08/01/2023] [Indexed: 11/14/2023] Open
Abstract
Magnetic resonance imaging (MRI) plays a significant role in the routine imaging workflow, providing both anatomical and functional information. 19F MRI is an evolving imaging modality where instead of 1H, 19F nuclei are excited. As the signal from endogenous 19F in the body is negligible, exogenous 19F signals obtained by 19F radiofrequency coils are exceptionally specific. Highly fluorinated agents targeting particular biological processes (i.e., the presence of immune cells) have been visualised using 19F MRI, highlighting its potential for non-invasive and longitudinal molecular imaging. This article aims to provide both a broad overview of the various applications of 19F MRI, with cancer imaging as a focus, as well as a practical guide to 19F imaging. We will discuss the essential elements of a 19F system and address common pitfalls during acquisition. Last but not least, we will highlight future perspectives that will enhance the role of this modality. While not an exhaustive exploration of all 19F literature, we endeavour to encapsulate the broad themes of the field and introduce the world of 19F molecular imaging to newcomers. 19F MRI bridges several domains, imaging, physics, chemistry, and biology, necessitating multidisciplinary teams to be able to harness this technology effectively. As further technical developments allow for greater sensitivity, we envision that 19F MRI can help unlock insight into biological processes non-invasively and longitudinally.
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Affiliation(s)
| | | | | | | | | | - Leila Akkari
- Division of Tumor Biology and Immunology, Oncode Institute, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | | | - René Bernards
- Division of Molecular Carcinogenesis, Oncode Institute, The Netherlands Cancer Institute, Amsterdam, The Netherlands
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Puskar A, Saadah B, Rauf A, Kasperek SR, Umair M. A primer on contrast agents for magnetic resonance imaging of post‐procedural and follow‐up imaging of islet cell transplant. NANO SELECT 2023. [DOI: 10.1002/nano.202200147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023] Open
Affiliation(s)
- Anessa Puskar
- Carle Illinois College of Medicine Urbana‐Champaign Urbana Illinois USA
| | - Bara Saadah
- Carle Illinois College of Medicine Urbana‐Champaign Urbana Illinois USA
| | - Asad Rauf
- Carle Illinois College of Medicine Urbana‐Champaign Urbana Illinois USA
| | | | - Muhammad Umair
- Department of Radiology Johns Hopkins Baltimore Maryland USA
- Department of Biomedical Engineering University of Illinois Urbana‐Champaign Urbana Illinois USA
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Bodalal Z, Katz S, Shi H, Beets-Tan R. "Advances in cancer imaging and technology"-special collection -introductory Editorial. BJR Open 2022; 4:20229003. [PMID: 38525165 PMCID: PMC10959000 DOI: 10.1259/bjro.20229003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
| | - Sharyn Katz
- Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, USA
| | - Haibin Shi
- Center for Molecular Imaging and Nuclear Medicine, School of Radiation Medicine and Protection, Medical College of Soochow University, Suzhou, China
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Magnetic Resonance Imaging Evaluation of Hemangioma Resection for Encephalofacial Angiomatosis (Sturge-Weber Syndrome) in Children under Intelligent Algorithm. CONTRAST MEDIA & MOLECULAR IMAGING 2022; 2022:7399255. [PMID: 35480081 PMCID: PMC9012624 DOI: 10.1155/2022/7399255] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 03/09/2022] [Indexed: 01/12/2023]
Abstract
This study was aimed to evaluate the clinical efficacy of hemangioma resection in the treatment of infantile encephalofacial angiomatosis (Sturge–Weber syndrome, SWS) through magnetic resonance imaging (MRI) images, and intelligent algorithms were employed to process MRI images. A retrospective study of 45 children diagnosed with facial hemangioma admitted to hospital was conducted. Then, MRS images were acquired, and a mathematical model for MRI image denoising and reconstruction was constructed based on nonlocal similar block low-rank prior algorithms. The processing effect was assessed regarding the peak signal-to-noise ratio (PSNR) and structural similarity (SSIM). Finally, MRI images were collected to analyze the difference between the metabolites of N-acetylaspartic acid (NAA), creatine (Cr), choline (Cho), and their ratios in the lesions of the children before and after treatment. The improvement rate was analyzed through a twelve-month follow-up. The algorithm test results showed that compared with the classic K-singular value decomposition (K-SVD) denoising algorithm and the Sparse MRI reconstruction algorithm, the proposed algorithm processed MRI images more clearly and had more detailed information. The quantitative results showed that the PSNR and SSIM in the image processed by the algorithm proposed were remarkably large. The clinical treatment results showed that compared with those before treatment, the nCho level after treatment, the ratio of Cho/Cr and Cho/NAA were remarkably reduced, and the difference was remarkable (P < 0.05). The follow-up results showed that the considerable improvement rate was 88.89%, the postoperative organ remodeling rate was 17.78%, and the probability of reoperation was only 6.67%. In summary, the introduction of intelligent algorithms for denoising and reconstruction of MRI images can remarkably improve image quality and help doctors use image information to diagnose diseases and evaluate treatment effects. The hemangioma resection for the treatment of pediatric SWS had a high treatment improvement rate and was worthy of clinical adoption.
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Saini S, Vanherwegen AS, Liang S, Verbeke R, Korf H, Lentacker I, De Smedt SC, Gysemans C, Himmelreich U. Fluorine MR Imaging Probes Dynamic Migratory Profiles of Perfluorocarbon-Loaded Dendritic Cells After Streptozotocin-Induced Inflammation. Mol Imaging Biol 2022; 24:321-332. [PMID: 35060024 DOI: 10.1007/s11307-021-01701-1] [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: 04/07/2020] [Revised: 12/27/2021] [Accepted: 12/28/2021] [Indexed: 10/19/2022]
Abstract
PURPOSE The pathogenesis of type 1 diabetes (T1D) involves presentation of islet-specific self-antigens by dendritic cells (DCs) to autoreactive T cells, resulting in the destruction of insulin-producing pancreatic beta cells. We aimed to study the dynamic homing of diabetes-prone DCs to the pancreas and nearby organs with and without induction of pancreatic stress in a T1D susceptible model of repeated streptozotocin (STZ) injection. PROCEDURES In vitro labeling of activated bone marrow-derived DCs (BMDCs) from NOD (Nonobese diabetes) mice was performed using zonyl perfluoro-15-crown-5-ether nanoparticles (ZPFCE-NPs). Internalization of particles was confirmed by confocal microscopy. Two groups of NOD.SCID (nonobese diabetic/severe combined immunodeficiency) mice with (induced by low dose STZ administration) or without pancreatic stress were compared. Diabetogenic BMDCs loaded with BDC2.5 mimotope were pre-labeled with ZPFCE-NPs and adoptively transferred into mice. Longitudinal in vivo fluorine MRI (19F MRI) was performed 24 h, 36 h and 48 h after transfer of BMDCs. For ex vivo quantification of labeled cells, 19F NMR and flow cytometry were performed on dissected tissues to validate in vivo 19F MRI data. RESULTS In vitro flow cytometry and confocal microscopy confirmed high uptake of nanoparticles in BMDCs during the process of maturation. Migration/homing of activated and ZPFCE-NP- labeled BMDCs to different organs was monitored and quantified longitudinally, showing highest cell density in pancreas at 48-h time-point. Based on 19F MRI, STZ induced mild inflammation in the pancreatic region, as indicated by high accumulation of ZPFCE-NP-labeled BMDCs in the pancreas when compared to the vehicle group. Pancreatic draining lymph nodes showed elevated homing of labeled BMDCs in the vehicle groups in contrast to the STZ group after 72 h. The effect of STZ was confirmed by increased blood glucose levels. CONCLUSION We showed the potential of 19F MRI for the non-invasive visualization and quantification of migrating immune cells in models for pancreatic inflammation after STZ administration. Without any intrinsic background signal, 19F MRI serves as a highly specific imaging tool to study the migration of diabetic-prone BMDCs in T1D models in vivo. This approach could particularly be of interest for the longitudinal assessment of established or novel anti-inflammatory therapeutic approaches in preclinical models.
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Affiliation(s)
- Shweta Saini
- Biomedical MRI/Molecular Small Animal Imaging Center (MoSAIC), KU Leuven, Leuven, Belgium
| | | | - Sayuan Liang
- Biomedical MRI/Molecular Small Animal Imaging Center (MoSAIC), KU Leuven, Leuven, Belgium
- Philips Research China, Shanghai, China
| | - Rein Verbeke
- General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, Belgium
| | - Hannelie Korf
- Laboratory of Hepatology, CHROMETA, KU Leuven, Leuven, Belgium
| | - Ine Lentacker
- General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, Belgium
| | - Stefaan C De Smedt
- General Biochemistry and Physical Pharmacy, University of Ghent, Ghent, Belgium
| | - Conny Gysemans
- Clinical and Experimental Endocrinology, CHROMETA, KU Leuven, Leuven, Belgium
| | - Uwe Himmelreich
- Biomedical MRI/Molecular Small Animal Imaging Center (MoSAIC), KU Leuven, Leuven, Belgium.
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Chapelin F, Gedaly R, Sweeney Z, Gossett LJ. Prognostic Value of Fluorine-19 MRI Oximetry Monitoring in cancer. Mol Imaging Biol 2022; 24:208-219. [PMID: 34708396 DOI: 10.1007/s11307-021-01648-3] [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: 06/10/2021] [Revised: 08/27/2021] [Accepted: 08/30/2021] [Indexed: 11/24/2022]
Abstract
Hypoxia is a key prognostic indicator in most solid tumors, as it is correlated to tumor angiogenesis, metastasis, recurrence, and response to therapy. Accurate measurement and mapping of tumor oxygenation profile and changes upon intervention could facilitate disease progression assessment and assist in treatment planning. Currently, no gold standard exists for non-invasive spatiotemporal measurement of hypoxia. Magnetic resonance imaging (MRI) represents an attractive option as it is a clinically available and non-ionizing imaging modality. Specifically, perfluorocarbon (PFC) beacons can be externally introduced into the tumor tissue and the linear dependence of their spin-lattice relaxation rate (R1) on the local partial pressure of oxygen (pO2) exploited for real-time tissue oxygenation monitoring in vivo. In this review, we will focus on early studies and recent developments of fluorine-19 MRI and spectroscopy (MRS) for evaluation of tumor oximetry and response to therapy.
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Affiliation(s)
- Fanny Chapelin
- F. Joseph Halcomb III, M.D. Department of Biomedical Engineering, University of Kentucky, 514F RMB, 143 Graham Avenue, Lexington, KY, USA.
- Lucille Parker Markey Cancer Center, University of Kentucky, Lexington, KY, USA.
| | - Roberto Gedaly
- Lucille Parker Markey Cancer Center, University of Kentucky, Lexington, KY, USA
- Department of Surgery, Transplant Division, University of Kentucky, Lexington, KY, USA
| | - Zachary Sweeney
- College of Medicine, University of Kentucky, Lexington, KY, USA
| | - Liza J Gossett
- F. Joseph Halcomb III, M.D. Department of Biomedical Engineering, University of Kentucky, 514F RMB, 143 Graham Avenue, Lexington, KY, USA
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Joseph JM, Gigliobianco MR, Firouzabadi BM, Censi R, Di Martino P. Nanotechnology as a Versatile Tool for 19F-MRI Agent's Formulation: A Glimpse into the Use of Perfluorinated and Fluorinated Compounds in Nanoparticles. Pharmaceutics 2022; 14:382. [PMID: 35214114 PMCID: PMC8874484 DOI: 10.3390/pharmaceutics14020382] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/28/2022] [Accepted: 02/02/2022] [Indexed: 02/04/2023] Open
Abstract
Simultaneously being a non-radiative and non-invasive technique makes magnetic resonance imaging (MRI) one of the highly sought imaging techniques for the early diagnosis and treatment of diseases. Despite more than four decades of research on finding a suitable imaging agent from fluorine for clinical applications, it still lingers as a challenge to get the regulatory approval compared to its hydrogen counterpart. The pertinent hurdle is the simultaneous intrinsic hydrophobicity and lipophobicity of fluorine and its derivatives that make them insoluble in any liquids, strongly limiting their application in areas such as targeted delivery. A blossoming technique to circumvent the unfavorable physicochemical characteristics of perfluorocarbon compounds (PFCs) and guarantee a high local concentration of fluorine in the desired body part is to encapsulate them in nanosystems. In this review, we will be emphasizing different types of nanocarrier systems studied to encapsulate various PFCs and fluorinated compounds, headway to be applied as a contrast agent (CA) in fluorine-19 MRI (19F MRI). We would also scrutinize, especially from studies over the last decade, the different types of PFCs and their specific applications and limitations concerning the nanoparticle (NP) system used to encapsulate them. A critical evaluation for future opportunities would be speculated.
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Affiliation(s)
- Joice Maria Joseph
- School of Pharmacy, University of Camerino, 62032 Camerino, Italy; (J.M.J.); (B.M.F.); (P.D.M.)
| | | | | | - Roberta Censi
- School of Pharmacy, University of Camerino, 62032 Camerino, Italy; (J.M.J.); (B.M.F.); (P.D.M.)
| | - Piera Di Martino
- School of Pharmacy, University of Camerino, 62032 Camerino, Italy; (J.M.J.); (B.M.F.); (P.D.M.)
- Dipartimento di Farmacia, Università “G. D’Annunzio” Chieti e Pescara, 66100 Chieti, Italy
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Modo M. 19F Magnetic Resonance Imaging and Spectroscopy in Neuroscience. Neuroscience 2021; 474:37-50. [PMID: 33766776 DOI: 10.1016/j.neuroscience.2021.03.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 03/11/2021] [Accepted: 03/12/2021] [Indexed: 12/23/2022]
Abstract
1H magnetic resonance imaging (MRI) has established itself as a key diagnostic technique, affording the visualization of brain anatomy, blood flow, activity and connectivity. The detection of other atoms (e.g. 19F, 23Na, 31P), so called hetero-nuclear MRI and spectroscopy (MRS), provides investigative avenues that complement and extend the richness of information that can be gained from 1H MRI. Especially 19F MRI is increasingly emerging as a multi-nuclear (1H/19F) technique that can be exploited to visualize cell migration and trafficking. The lack of a 19F background signal in the brain affords an unequivocal detection suitable for quantification. Fluorine-based contrast material can be engineered as nanoemulsions, nanocapsules, or nanoparticles to label cells in vitro or in vivo. Fluorinated blood substitutes, typically nanoemulsions, can also carry oxygen and serve as a theranostic in poorly perfused brain regions. Brain tissue concentrations of fluorinated pharmaceuticals, including inhalation anesthetics (e.g. isoflurane) and anti-depressants (e.g. fluoxetine), can also be measured using MRS. However, the low signal from these compounds provides a challenge for imaging. Further methodological advances that accelerate signal acquisition (e.g. compressed sensing, cryogenic coils) are required to expand the applications of 19F MR imaging to, for instance, determine the regional pharmacokinetics of novel fluorine-based drugs. Improvements in 19F signal detection and localization, combined with the development of novel sensitive probes, will increase the utility of these multi-nuclear studies. These advances will provide new insights into cellular and molecular processes involved in neurodegenerative disease, as well as the mode of action of pharmaceutical compounds.
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Affiliation(s)
- Michel Modo
- Department of Radiology, University of Pittsburgh, Pittsburgh, PA, USA; McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA.
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Darçot E, Yerly J, Hilbert T, Colotti R, Najdenovska E, Kober T, Stuber M, van Heeswijk RB. Compressed sensing with signal averaging for improved sensitivity and motion artifact reduction in fluorine-19 MRI. NMR IN BIOMEDICINE 2021; 34:e4418. [PMID: 33002268 DOI: 10.1002/nbm.4418] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 09/09/2020] [Accepted: 09/11/2020] [Indexed: 06/11/2023]
Abstract
Fluorine-19 (19 F) MRI of injected perfluorocarbon emulsions (PFCs) allows for the non-invasive quantification of inflammation and cell tracking, but suffers from a low signal-to-noise ratio and extended scan time. To address this limitation, we tested the hypotheses that a 19 F MRI pulse sequence that combines a specific undersampling regime with signal averaging has both increased sensitivity and robustness against motion artifacts compared with a non-averaged fully sampled pulse sequence, when both datasets are reconstructed with compressed sensing. As a proof of principle, numerical simulations and phantom experiments were performed on selected variable ranges to characterize the point spread function of undersampling patterns, as well as the vulnerability to noise of undersampling and reconstruction parameters with paired numbers of x signal averages and acceleration factor x (NAx-AFx). The numerical simulations demonstrated that a probability density function that uses 25% of the samples to fully sample the k-space central area allowed for an optimal balance between limited blurring and artifact incoherence. At all investigated noise levels, the Dice similarity coefficient (DSC) strongly depended on the regularization parameters and acceleration factor. In phantoms, the motion robustness of an NA8-AF8 undersampling pattern versus NA1-AF1 was evaluated with simulated and real motion patterns. Differences were assessed with the DSC, which was consistently higher for the NA8-AF8 compared with the NA1-AF1 strategy, for both simulated and real cyclic motion patterns (P < 0.001). Both strategies were validated in vivo in mice (n = 2) injected with perfluoropolyether. Here, the images displayed a sharper delineation of the liver with the NA8-AF8 strategy than with the NA1-AF1 strategy. In conclusion, we validated the hypotheses that in 19 F MRI the combination of undersampling and averaging improves both the sensitivity and the robustness against motion artifacts.
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Affiliation(s)
- Emeline Darçot
- Department of Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
| | - Jérôme Yerly
- Department of Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
- Lausanne and Geneva, Switzerland
| | - Tom Hilbert
- Department of Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
- Advanced Clinical Imaging Technology (HC CMEA SUI DI PI), Siemens Healthcare AG, Lausanne, Switzerland
- Signal Processing Laboratory 5 (LTS5), École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Roberto Colotti
- Department of Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
| | - Elena Najdenovska
- Department of Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
- Lausanne and Geneva, Switzerland
| | - Tobias Kober
- Department of Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
- Advanced Clinical Imaging Technology (HC CMEA SUI DI PI), Siemens Healthcare AG, Lausanne, Switzerland
- Signal Processing Laboratory 5 (LTS5), École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Matthias Stuber
- Department of Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
- Lausanne and Geneva, Switzerland
| | - Ruud B van Heeswijk
- Department of Radiology, University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
- Lausanne and Geneva, Switzerland
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Feng Z, Li Q, Wang W, Ni Q, Wang Y, Song H, Zhang C, Kong D, Liang XJ, Huang P. Superhydrophilic fluorinated polymer and nanogel for high-performance 19F magnetic resonance imaging. Biomaterials 2020; 256:120184. [DOI: 10.1016/j.biomaterials.2020.120184] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 05/27/2020] [Accepted: 06/07/2020] [Indexed: 12/12/2022]
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Darçot E, Colotti R, Brennan D, Deuchar GA, Santosh C, van Heeswijk RB. A characterization of ABL-101 as a potential tracer for clinical fluorine-19 MRI. NMR IN BIOMEDICINE 2020; 33:e4212. [PMID: 31724252 DOI: 10.1002/nbm.4212] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 10/10/2019] [Accepted: 10/18/2019] [Indexed: 06/10/2023]
Abstract
The two main challenges that prevent the translation of fluorine-19 (19 F) MRI for inflammation monitoring or cell tracking into clinical practice are (i) the relatively low signal-to-noise ratio generated by the injected perfluorocarbon (PFC), which necessitates long scan times, and (ii) the need for regulatory approval and a high biocompatibility of PFCs that are also suitable for MRI. ABL-101, an emulsion of perfluoro(t-butylcyclohexane), is a third-generation PFC that is already used in clinical trials, but has not yet been used for 19 F MRI. The objective of this study was therefore to assess the performance of ABL-101 as a 19 F MRI tracer. At magnetic field strengths of 3, 9.4 and 14.1 T, the CF3 groups of ABL-101 generated a large well-separated singlet with T2 /T1 ratios of >0.27, >0.14 and > 0.05, respectively. All relaxation times decreased with the increase in magnetic field strength. The detection limit of ABL-101 in a 0.25 mm3 voxel at 3 T, 37°C and with a 3-minute acquisition time was 7.21mM. After intravenous injection, the clearance half-lives of the ABL-101 19 F MR signal in mouse (n = 3) spleen and liver were 6.85 ± 0.45 and 3.20 ± 0.35 days, respectively. These results demonstrate that ABL-101 has 19 F MR characteristics that are similar to those of PFCs developed specifically for MRI, while it has clearance half-lives similar to PFCs that have previously been used in large doses in non-MRI clinical trials. Overall, ABL-101 is thus a very promising candidate tracer for future clinical trials that use 19 F MRI for cell tracking or the monitoring of inflammation.
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Affiliation(s)
- Emeline Darçot
- Department of Radiology, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
| | - Roberto Colotti
- Department of Radiology, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
| | - David Brennan
- Department of Neuroradiology, Institute of Neurological Sciences, Queen Elizabeth University Hospital, Glasgow, UK
- Aurum Biosciences Ltd, Glasgow, UK
| | | | - Celestine Santosh
- Department of Neuroradiology, Institute of Neurological Sciences, Queen Elizabeth University Hospital, Glasgow, UK
- Aurum Biosciences Ltd, Glasgow, UK
| | - Ruud B van Heeswijk
- Department of Radiology, Lausanne University Hospital (CHUV) and University of Lausanne (UNIL), Lausanne, Switzerland
- Center for Biomedical Imaging (CIBM), Lausanne and Geneva, Switzerland
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14
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Starke L, Pohlmann A, Prinz C, Niendorf T, Waiczies S. Performance of compressed sensing for fluorine-19 magnetic resonance imaging at low signal-to-noise ratio conditions. Magn Reson Med 2019; 84:592-608. [PMID: 31863516 DOI: 10.1002/mrm.28135] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 11/19/2019] [Accepted: 11/27/2019] [Indexed: 12/27/2022]
Abstract
PURPOSE To examine the performance of compressed sensing (CS) in reconstructing low signal-to-noise ratio (SNR) 19 F MR signals that are close to the detection threshold and originate from small signal sources with no a priori known location. METHODS Regularization strength was adjusted automatically based on noise level. As performance metrics, root-mean-square deviations, true positive rates (TPRs), and false discovery rates were computed. CS and conventional reconstructions were compared at equal measurement time and evaluated in relation to high-SNR reference data. 19 F MR data were generated from a purpose-built phantom and benchmarked against simulations, as well as from the experimental autoimmune encephalomyelitis mouse model. We quantified the signal intensity bias and introduced an intensity calibration for in vivo data using high-SNR ex vivo data. RESULTS Low-SNR 19 F MR data could be reliably reconstructed. Detection sensitivity was consistently improved and data fidelity was preserved for undersampling and averaging factors of α = 2 or = 3. Higher α led to signal blurring in the mouse model. The improved TPRs at α = 3 were comparable to a 2.5-fold increase in measurement time. Whereas CS resulted in a downward bias of the 19 F MR signal, Fourier reconstructions resulted in an unexpected upward bias of similar magnitude. The calibration corrected signal-intensity deviations for all reconstructions. CONCLUSION CS is advantageous whenever image features are close to the detection threshold. It is a powerful tool, even for low-SNR data with sparsely distributed 19 F signals, to improve spatial and temporal resolution in 19 F MR applications.
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Affiliation(s)
- Ludger Starke
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Andreas Pohlmann
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Christian Prinz
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Thoralf Niendorf
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany.,Experimental and Clinical Research Center, a joint cooperation between the Charité Medical Faculty and the Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
| | - Sonia Waiczies
- Berlin Ultrahigh Field Facility (B.U.F.F.), Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
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15
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Cho MH, Shin SH, Park SH, Kadayakkara DK, Kim D, Choi Y. Targeted, Stimuli-Responsive, and Theranostic 19F Magnetic Resonance Imaging Probes. Bioconjug Chem 2019; 30:2502-2518. [DOI: 10.1021/acs.bioconjchem.9b00582] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Mi Hyeon Cho
- National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 10408, Republic of Korea
| | - Soo Hyun Shin
- National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 10408, Republic of Korea
| | - Sang Hyun Park
- National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 10408, Republic of Korea
| | - Deepak Kana Kadayakkara
- Department of Medicine, Bridgeport Hospital−Yale New Haven Health, Bridgeport, Connecticut 06610, United States
| | - Daehong Kim
- National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 10408, Republic of Korea
| | - Yongdoo Choi
- National Cancer Center, 323 Ilsan-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do 10408, Republic of Korea
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16
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Saini S, Poelmans J, Korf H, Dooley JL, Liang S, Manshian BB, Verbeke R, Soenen SJ, Vande Velde G, Lentacker I, Lagrou K, Liston A, Gysemans C, De Smedt SC, Himmelreich U. Longitudinal In Vivo Assessment of Host-Microbe Interactions in a Murine Model of Pulmonary Aspergillosis. iScience 2019; 20:184-194. [PMID: 31581067 PMCID: PMC6817634 DOI: 10.1016/j.isci.2019.09.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 07/24/2019] [Accepted: 09/13/2019] [Indexed: 01/01/2023] Open
Abstract
The fungus Aspergillus fumigatus is ubiquitous in nature and the most common cause of invasive pulmonary aspergillosis (IPA) in patients with a compromised immune system. The development of IPA in patients under immunosuppressive treatment or in patients with primary immunodeficiency demonstrates the importance of the host immune response in controlling aspergillosis. However, study of the host-microbe interaction has been hampered by the lack of tools for their non-invasive assessment. We developed a methodology to study the response of the host's immune system against IPA longitudinally in vivo by using fluorine-19 magnetic resonance imaging (19F MRI). We showed the advantage of a perfluorocarbon-based contrast agent for the in vivo labeling of macrophages and dendritic cells, permitting quantification of pulmonary inflammation in different murine IPA models. Our findings reveal the potential of 19F MRI for the assessment of rapid kinetics of innate immune response against IPA and the permissive niche generated through immunosuppression.
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Affiliation(s)
- Shweta Saini
- Biomedical MRI/Molecular Small Animal Imaging Center (MoSAIC), KU Leuven, Leuven, Belgium
| | - Jennifer Poelmans
- Biomedical MRI/Molecular Small Animal Imaging Center (MoSAIC), KU Leuven, Leuven, Belgium
| | - Hannelie Korf
- Laboratory of Hepatology, CHROMETA Department, KU Leuven, Leuven, Belgium
| | - James L Dooley
- Laboratory of Genetics of Autoimmunity (VIB-KU Leuven Center for Brain & Disease Research), Leuven, Belgium
| | - Sayuan Liang
- Biomedical MRI/Molecular Small Animal Imaging Center (MoSAIC), KU Leuven, Leuven, Belgium; Philips Research China, Shanghai, China
| | - Bella B Manshian
- Biomedical MRI/Molecular Small Animal Imaging Center (MoSAIC), KU Leuven, Leuven, Belgium
| | - Rein Verbeke
- Ghent Research Group on Nanomedicines, Ghent University, Belgium
| | - Stefaan J Soenen
- Biomedical MRI/Molecular Small Animal Imaging Center (MoSAIC), KU Leuven, Leuven, Belgium
| | - Greetje Vande Velde
- Biomedical MRI/Molecular Small Animal Imaging Center (MoSAIC), KU Leuven, Leuven, Belgium
| | - Ine Lentacker
- Ghent Research Group on Nanomedicines, Ghent University, Belgium
| | - Katrien Lagrou
- Clinical Bacteriology and Mycology, Department of Microbiology and Immunology, KU Leuven, Leuven, Belgium
| | - Adrian Liston
- Laboratory of Genetics of Autoimmunity (VIB-KU Leuven Center for Brain & Disease Research), Leuven, Belgium
| | - Conny Gysemans
- Clinical and Experimental Endocrinology, KU Leuven, Leuven, Belgium
| | | | - Uwe Himmelreich
- Biomedical MRI/Molecular Small Animal Imaging Center (MoSAIC), KU Leuven, Leuven, Belgium.
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Blunck Y, Kolbe SC, Moffat BA, Ordidge RJ, Cleary JO, Johnston LA. Compressed sensing effects on quantitative analysis of undersampled human brain sodium MRI. Magn Reson Med 2019; 83:1025-1033. [DOI: 10.1002/mrm.27993] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 07/30/2019] [Accepted: 08/19/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Yasmin Blunck
- Department of Biomedical Engineering The University of Melbourne Parkville Australia
- Melbourne Brain Centre Imaging Unit Department of Medicine and Radiology The University of Melbourne Parkville Australia
| | - Scott C. Kolbe
- Melbourne Brain Centre Imaging Unit Department of Medicine and Radiology The University of Melbourne Parkville Australia
| | - Bradford A. Moffat
- Melbourne Brain Centre Imaging Unit Department of Medicine and Radiology The University of Melbourne Parkville Australia
| | - Roger J. Ordidge
- Melbourne Brain Centre Imaging Unit Department of Medicine and Radiology The University of Melbourne Parkville Australia
| | - Jon O. Cleary
- Department of Radiology Guy's and St. Thomas’ NHS Foundation Trust London UK
| | - Leigh A. Johnston
- Department of Biomedical Engineering The University of Melbourne Parkville Australia
- Melbourne Brain Centre Imaging Unit Department of Medicine and Radiology The University of Melbourne Parkville Australia
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18
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Ghuman H, Hitchens TK, Modo M. A systematic optimization of 19F MR image acquisition to detect macrophage invasion into an ECM hydrogel implanted in the stroke-damaged brain. Neuroimage 2019; 202:116090. [PMID: 31408717 DOI: 10.1016/j.neuroimage.2019.116090] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 08/06/2019] [Accepted: 08/08/2019] [Indexed: 02/08/2023] Open
Abstract
19F-MR imaging of perfluorocarbon (PFC)-labeled macrophages can provide a unique insight into their participation and spatio-temporal dynamics of inflammatory events, such as the biodegradation of an extracellular matrix (ECM) hydrogel implanted into a stroke cavity. To determine the most efficient acquisition strategy for 19F-MR imaging, five commonly used sequences were optimized using a design of experiment (DoE) approach and compared based on their signal-to-noise ratio (SNR). The fast imaging with steady-state precession (FISP) sequence produced the most efficient detection of a 19F signal followed by the rapid acquisition with relaxation enhancement (RARE) sequence. The multi-slice multi-echo (MSME), fast low angle shot (FLASH), and zero echo time (ZTE) sequences were significantly less efficient. Imaging parameters (matrix/voxel size; slice thickness, number of averages) determined the accuracy (i.e. trueness and precision) of object identification by reducing partial volume effects, as determined by analysis of the point spread function (PSF). A 96 × 96 matrix size (0.35 mm3) produced the lowest limit of detection (LOD) for RARE (2.85 mM PFPE; 119 mM 19F) and FISP (0.43 mM PFPE; 18.1 mM 19F), with an SNR of 2 as the detection threshold. Imaging of a brain phantom with PFC-labeled macrophages invading an ECM hydrogel further illustrated the impact of these parameter changes. The systematic optimization of sequence and imaging parameters provides the framework for an accurate visualization of 19F-labeled macrophage distribution and density in the brain. This will enhance our understanding of the contribution of periphery-derived macrophages in bioscaffold degradation and its role in brain tissue regeneration.
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Affiliation(s)
- Harmanvir Ghuman
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
| | - T Kevin Hitchens
- Department of Neurobiology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Michel Modo
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Department of Radiology, University of Pittsburgh, Pittsburgh, PA, USA.
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19
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Gálisová A, Herynek V, Swider E, Sticová E, Pátiková A, Kosinová L, Kříž J, Hájek M, Srinivas M, Jirák D. A Trimodal Imaging Platform for Tracking Viable Transplanted Pancreatic Islets In Vivo: F-19 MR, Fluorescence, and Bioluminescence Imaging. Mol Imaging Biol 2019; 21:454-464. [PMID: 30167995 PMCID: PMC6525139 DOI: 10.1007/s11307-018-1270-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
PURPOSE Combining specific and quantitative F-19 magnetic resonance imaging (MRI) with sensitive and convenient optical imaging provides complementary information about the distribution and viability of transplanted pancreatic islet grafts. In this study, pancreatic islets (PIs) were labeled with positively charged multimodal nanoparticles based on poly(lactic-co-glycolic acid) (PLGA-NPs) with encapsulated perfluoro-15-crown-5-ether and the near-infrared fluorescent dye indocyanine green. PROCEDURES One thousand and three thousand bioluminescent PIs were transplanted into subcutaneous artificial scaffolds, which served as an alternative transplant site. The grafts were monitored using in vivo F-19 MR, fluorescence, and bioluminescence imaging in healthy rats for 2 weeks. RESULTS Transplanted PIs were unambiguously localized in the scaffolds by F-19 MRI throughout the whole experiment. Fluorescence was detected in the first 4 days after transplantation only. Importantly, in vivo bioluminescence correlated with the F-19 MRI signal. CONCLUSIONS We developed a trimodal imaging platform for in vivo examination of transplanted PIs. Fluorescence imaging revealed instability of the fluorescent dye and its limited applicability for longitudinal in vivo studies. A correlation between the bioluminescence signal and the F-19 MRI signal indicated the fast clearance of PLGA-NPs from the transplantation site after cell death, which addresses a major issue with intracellular imaging labels. Therefore, the proposed PLGA-NP platform is reliable for reflecting the status of transplanted PIs in vivo.
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Affiliation(s)
- A Gálisová
- MR Unit, Department of Radiodiagnostic and Interventional Radiology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - V Herynek
- MR Unit, Department of Radiodiagnostic and Interventional Radiology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
- Center for Advanced Preclinical Imaging, First Faculty of Medicine, Charles University, Prague, Czech Republic
| | - E Swider
- Department of Tumor Immunology, Radboud University Medical Center, Nijmegen, Netherlands
| | - E Sticová
- Department of Clinical and Transplant Pathology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
- Department of Pathology, Third Faculty of Medicine, Charles University, Prague, Czech Republic
| | - A Pátiková
- Centre of Experimental Medicine, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - L Kosinová
- Centre of Experimental Medicine, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - J Kříž
- Diabetes Centre, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - M Hájek
- MR Unit, Department of Radiodiagnostic and Interventional Radiology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic
| | - M Srinivas
- Department of Tumor Immunology, Radboud University Medical Center, Nijmegen, Netherlands
| | - D Jirák
- MR Unit, Department of Radiodiagnostic and Interventional Radiology, Institute for Clinical and Experimental Medicine, Prague, Czech Republic.
- Institute of Biophysics and Informatics, First Faculty of Medicine, Charles University in Prague, Prague, Czech Republic.
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20
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Canellas R, Rosenkrantz AB, Taouli B, Sala E, Saini S, Pedrosa I, Wang ZJ, Sahani DV. Abbreviated MRI Protocols for the Abdomen. Radiographics 2019; 39:744-758. [PMID: 30901285 DOI: 10.1148/rg.2019180123] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Technical advances in MRI have improved image quality and have led to expanding clinical indications for its use. However, long examination and interpretation times, as well as higher costs, still represent barriers to use of MRI. Abbreviated MRI protocols have emerged as an alternative to standard MRI protocols. These abbreviated MRI protocols seek to reduce longer MRI protocols by eliminating unnecessary or redundant sequences that negatively affect cost, MRI table time, patient comfort, image quality, and image interpretation time. However, the diagnostic information is generally not compromised. Abbreviated MRI protocols have already been used successfully for hepatocellular carcinoma screening, for prostate cancer detection, and for screening for nonalcoholic fatty liver disease as well as monitoring patients with this disease. It has been reported that image acquisition time and costs can be considerably reduced with abbreviated MRI protocols, compared with standard MRI protocols, while maintaining a similar sensitivity and accuracy. Nevertheless, multiple applications still need to be explored in the abdomen and pelvis (eg, surveillance of metastases to the liver; follow-up of cystic pancreatic lesions, adrenal incidentalomas, and small renal masses; evaluation of ovarian cysts in postmenopausal women; staging of cervical and uterine corpus neoplasms; evaluation of müllerian duct anomalies). This article describes some successful applications of abbreviated MRI protocols, demonstrates how they can help in improving the MRI workflow, and explores potential future directions. ©RSNA, 2019.
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Affiliation(s)
- Rodrigo Canellas
- From the Department of Radiology, Massachusetts General Hospital, 55 Fruit St, White 270, Boston, MA 02114 (R.C., S.S., D.V.S.); Department of Radiology, NYU Langone Health, New York, NY (A.B.R.); Department of Radiology, Mount Sinai Hospital, New York, NY (B.T.); Department of Radiology, University of Cambridge, Cambridge, England (E.S.); Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Tex (I.P.); and Department of Radiology, UCSF Medical Center, San Francisco, Calif (Z.J.W.)
| | - Andrew B Rosenkrantz
- From the Department of Radiology, Massachusetts General Hospital, 55 Fruit St, White 270, Boston, MA 02114 (R.C., S.S., D.V.S.); Department of Radiology, NYU Langone Health, New York, NY (A.B.R.); Department of Radiology, Mount Sinai Hospital, New York, NY (B.T.); Department of Radiology, University of Cambridge, Cambridge, England (E.S.); Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Tex (I.P.); and Department of Radiology, UCSF Medical Center, San Francisco, Calif (Z.J.W.)
| | - Bachir Taouli
- From the Department of Radiology, Massachusetts General Hospital, 55 Fruit St, White 270, Boston, MA 02114 (R.C., S.S., D.V.S.); Department of Radiology, NYU Langone Health, New York, NY (A.B.R.); Department of Radiology, Mount Sinai Hospital, New York, NY (B.T.); Department of Radiology, University of Cambridge, Cambridge, England (E.S.); Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Tex (I.P.); and Department of Radiology, UCSF Medical Center, San Francisco, Calif (Z.J.W.)
| | - Evis Sala
- From the Department of Radiology, Massachusetts General Hospital, 55 Fruit St, White 270, Boston, MA 02114 (R.C., S.S., D.V.S.); Department of Radiology, NYU Langone Health, New York, NY (A.B.R.); Department of Radiology, Mount Sinai Hospital, New York, NY (B.T.); Department of Radiology, University of Cambridge, Cambridge, England (E.S.); Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Tex (I.P.); and Department of Radiology, UCSF Medical Center, San Francisco, Calif (Z.J.W.)
| | - Sanjay Saini
- From the Department of Radiology, Massachusetts General Hospital, 55 Fruit St, White 270, Boston, MA 02114 (R.C., S.S., D.V.S.); Department of Radiology, NYU Langone Health, New York, NY (A.B.R.); Department of Radiology, Mount Sinai Hospital, New York, NY (B.T.); Department of Radiology, University of Cambridge, Cambridge, England (E.S.); Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Tex (I.P.); and Department of Radiology, UCSF Medical Center, San Francisco, Calif (Z.J.W.)
| | - Ivan Pedrosa
- From the Department of Radiology, Massachusetts General Hospital, 55 Fruit St, White 270, Boston, MA 02114 (R.C., S.S., D.V.S.); Department of Radiology, NYU Langone Health, New York, NY (A.B.R.); Department of Radiology, Mount Sinai Hospital, New York, NY (B.T.); Department of Radiology, University of Cambridge, Cambridge, England (E.S.); Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Tex (I.P.); and Department of Radiology, UCSF Medical Center, San Francisco, Calif (Z.J.W.)
| | - Zhen J Wang
- From the Department of Radiology, Massachusetts General Hospital, 55 Fruit St, White 270, Boston, MA 02114 (R.C., S.S., D.V.S.); Department of Radiology, NYU Langone Health, New York, NY (A.B.R.); Department of Radiology, Mount Sinai Hospital, New York, NY (B.T.); Department of Radiology, University of Cambridge, Cambridge, England (E.S.); Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Tex (I.P.); and Department of Radiology, UCSF Medical Center, San Francisco, Calif (Z.J.W.)
| | - Dushyant V Sahani
- From the Department of Radiology, Massachusetts General Hospital, 55 Fruit St, White 270, Boston, MA 02114 (R.C., S.S., D.V.S.); Department of Radiology, NYU Langone Health, New York, NY (A.B.R.); Department of Radiology, Mount Sinai Hospital, New York, NY (B.T.); Department of Radiology, University of Cambridge, Cambridge, England (E.S.); Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Tex (I.P.); and Department of Radiology, UCSF Medical Center, San Francisco, Calif (Z.J.W.)
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Jirak D, Galisova A, Kolouchova K, Babuka D, Hruby M. Fluorine polymer probes for magnetic resonance imaging: quo vadis? MAGMA (NEW YORK, N.Y.) 2019; 32:173-185. [PMID: 30498886 PMCID: PMC6514090 DOI: 10.1007/s10334-018-0724-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 11/19/2018] [Accepted: 11/21/2018] [Indexed: 12/26/2022]
Abstract
Over the last few years, the development and relevance of 19F magnetic resonance imaging (MRI) for use in clinical practice has emerged. MRI using fluorinated probes enables the achievement of a specific signal with high contrast in MRI images. However, to ensure sufficient sensitivity of 19F MRI, fluorine probes with a high content of chemically equivalent fluorine atoms are required. The majority of 19F MRI agents are perfluorocarbon emulsions, which have a broad range of applications in molecular imaging, although the content of fluorine atoms in these molecules is limited. In this review, we focus mainly on polymer probes that allow higher fluorine content and represent versatile platforms with properties tailorable to a plethora of biomedical in vivo applications. We discuss the chemical development, up to the first imaging applications, of these promising fluorine probes, including injectable polymers that form depots that are intended for possible use in cancer therapy.
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Affiliation(s)
- Daniel Jirak
- Institute for Clinical and Experimental Medicine, Vídeňská 9, 140 21, Prague 4, Czech Republic.
- Institute of Biophysics and Informatics, 1st Medicine Faculty, Charles University, Salmovská 1, 120 00, Prague, Czech Republic.
- Faculty of Health Studies, Technical University of Liberec, Studentská 1402/2, 461 17, Liberec 1, Czech Republic.
| | - Andrea Galisova
- Institute for Clinical and Experimental Medicine, Vídeňská 9, 140 21, Prague 4, Czech Republic
| | - Kristyna Kolouchova
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského sq. 2, 162 06, Prague 6, Czech Republic
| | - David Babuka
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského sq. 2, 162 06, Prague 6, Czech Republic
| | - Martin Hruby
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského sq. 2, 162 06, Prague 6, Czech Republic
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22
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Saini S, Korf H, Liang S, Verbeke R, Manshian B, Raemdonck K, Lentacker I, Gysemans C, De Smedt SC, Himmelreich U. Challenges for labeling and longitudinal tracking of adoptively transferred autoreactive T lymphocytes in an experimental type-1 diabetes model. MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE 2019; 32:295-305. [PMID: 30648196 DOI: 10.1007/s10334-018-0720-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 11/20/2018] [Indexed: 12/26/2022]
Abstract
OBJECTIVE Tracking the autoreactive T-cell migration in the pancreatic region after labeling with fluorinated nanoparticles (1,2-dioleoyl-sn-glycero-3-phosphoethanolamine-N-[3-(2-pyridyldithio)propionate]-perfluoro-15-crown-5-ether nanoparticles, PDP-PFCE NPs) in a diabetic murine model using 19F MRI. MATERIALS AND METHODS Synthesis of novel PDP-PFCE fluorine tracer was performed for in vitro labeling of T cells. Labeling conditions were optimized using different PDP-PFCE NPs concentrations. For in vivo 19F MRI, mice were longitudinally followed after adoptive transfer of activated, autoreactive, labeled T cells in NOD.SCID mice. RESULTS Established MR protocols were used for challenging T cell labeling to track inflammation in a model of diabetes after successful labeling of CD4+ and CD8+ T cells with PDP-PFCE NPs. However, T cells were difficult to be detected in vivo after their engraftment in animals. DISCUSSION We showed successful in vitro labeling of T cells using novel fluorinated liposomal nanoparticles. However, insufficient and slow accumulation of labeled T cells and subsequent T cell proliferation in the pancreatic region remains as limitations of in vivo cell imaging by 19F MRI.
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Affiliation(s)
- Shweta Saini
- Biomedical MRI/MoSAIC, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | - Hannelie Korf
- Laboratory of Hepatology, CHROMETA Department, KU Leuven, Leuven, Belgium
| | | | - Rein Verbeke
- Ghent Research Group on Nanomedicines, Ghent University, Ghent, Belgium
| | - Bella Manshian
- Biomedical MRI/MoSAIC, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | - Koen Raemdonck
- Ghent Research Group on Nanomedicines, Ghent University, Ghent, Belgium
| | - Ine Lentacker
- Ghent Research Group on Nanomedicines, Ghent University, Ghent, Belgium
| | - Conny Gysemans
- Clinical and Experimental Endocrinology, KU Leuven, Leuven, Belgium
| | | | - Uwe Himmelreich
- Biomedical MRI/MoSAIC, Department of Imaging and Pathology, KU Leuven, Leuven, Belgium.
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