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Vernikouskaya I, Bertsche D, Metze P, Schneider LM, Rasche V. Multi-network approach for image segmentation in non-contrast enhanced cardiac 3D MRI of arrhythmic patients. Comput Med Imaging Graph 2024; 113:102340. [PMID: 38277768 DOI: 10.1016/j.compmedimag.2024.102340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 01/16/2024] [Accepted: 01/16/2024] [Indexed: 01/28/2024]
Abstract
Left atrial appendage (LAA) is the source of thrombi formation in more than 90% of strokes in patients with nonvalvular atrial fibrillation. Catheter-based LAA occlusion is being increasingly applied as a treatment strategy to prevent stroke. Anatomical complexity of LAA makes percutaneous occlusion commonly performed under transesophageal echocardiography (TEE) and X-ray (XR) guidance especially challenging. Image fusion techniques integrating 3D anatomical models derived from pre-procedural imaging into the live XR fluoroscopy can be applied to guide each step of the LAA closure. Cardiac magnetic resonance (CMR) imaging gains in importance for radiation-free evaluation of cardiac morphology as alternative to gold-standard TEE or computed tomography angiography (CTA). Manual delineation of cardiac structures from non-contrast enhanced CMR is, however, labor-intensive, tedious, and challenging due to the rather low contrast. Additionally, arrhythmia often impairs the image quality in ECG synchronized acquisitions causing blurring and motion artifacts. Thus, for cardiac segmentation in arrhythmic patients, there is a strong need for an automated image segmentation method. Deep learning-based methods have shown great promise in medical image analysis achieving superior performance in various imaging modalities and different clinical applications. Fully-convolutional neural networks (CNNs), especially U-Net, have become the method of choice for cardiac segmentation. In this paper, we propose an approach for automatic segmentation of cardiac structures from non-contrast enhanced CMR images of arrhythmic patients based on CNNs implemented in a multi-stage pipeline. Two-stage implementation allows subdividing the task into localization of the relevant cardiac structures and segmentation of these structures from the cropped sub-regions obtained from previous step leading to efficient and effective way of automated cardiac segmentation.
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Affiliation(s)
- Ina Vernikouskaya
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Dagmar Bertsche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Patrick Metze
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Leonhard M Schneider
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
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2
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Wimmer N, Müller H, Metze P, Rasche V, Ludolph AC, Kassubek J. The central pattern of weakness of ALS: Morphological correlates in whole-body muscle MRI. Ann Clin Transl Neurol 2024; 11:1000-1010. [PMID: 38356047 PMCID: PMC11021606 DOI: 10.1002/acn3.52019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 01/12/2024] [Accepted: 01/30/2024] [Indexed: 02/16/2024] Open
Abstract
OBJECTIVE Monosynaptically cortically innervated α-motoneurons are early and strongly involved in amyotrophic lateral sclerosis (ALS). Consequently, the muscles that receive the strongest direct corticomotoneuronal input are the clinically most affected. To objectify this concept in vivo through morphological image correlates, whole-body magnetic resonance imaging (MRI) with muscle signal analysis was performed in patients with ALS compared to healthy controls. METHODS Modified Dixon-based whole-body MRI was acquired in patients with ALS (n = 33) and matched healthy controls (n = 30). Manual labeling of limb muscle MRI was performed, and a specific subset of nine muscles, selected as pairs of muscle groups with different corticomotoneuronal input, was analyzed per subject based on their volume, fat fraction, and functional remaining muscle area (fRMA). RESULTS Statistical analysis of 978 muscles in total revealed significantly decreased volumes, decreased fRMA, and increased fat fraction in the muscles of patients with ALS compared to controls. The clinical degree of pareses of directly innervated muscles was significantly worse than that of less directly innervated muscles in each comparison. The muscles receiving stronger direct corticomotoneuronal input showed more pronounced morphological involvement compared to those with less monosynaptic corticomotoneuronal input (fRMA, significant in three pairwise comparisons). INTERPRETATION In conclusion, whole-body MRI-based muscle analysis provided additional evidence for a characteristic pattern of pareses in ALS. This technical approach (parameterization and quantification of muscle alterations from MRI) to patients with ALS could pave the way for the future establishment of a diagnostic algorithm of muscle MRI for ALS and may serve as a biomarker.
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Affiliation(s)
| | | | - Patrick Metze
- Department of Internal Medicine IIUlm University Medical CenterUlmGermany
| | - Volker Rasche
- Department of Internal Medicine IIUlm University Medical CenterUlmGermany
| | - Albert C. Ludolph
- Department of NeurologyUniversity Hospital UlmUlmGermany
- German Centre of Neurodegenerative Diseases (DZNE)UlmGermany
| | - Jan Kassubek
- Department of NeurologyUniversity Hospital UlmUlmGermany
- German Centre of Neurodegenerative Diseases (DZNE)UlmGermany
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3
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Bertsche D, Metze P, Schneider LM, Vernikouskaya I, Rasche V. Impact of cardiac and respiratory motion on the 3D accuracy of image-guided interventions on monoplane systems. Int J Comput Assist Radiol Surg 2024; 19:367-374. [PMID: 37477817 DOI: 10.1007/s11548-023-02998-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 07/04/2023] [Indexed: 07/22/2023]
Abstract
PURPOSE Image-guided intervention (IGI) systems have the potential to increase the efficiency in interventional cardiology but face limitations from motion. Even though motion compensation approaches have been proposed, the resulting accuracy has rarely been quantified using in vivo data. The purpose of this study is to investigate the potential benefit of motion-compensation in IGS systems. METHODS Patients scheduled for left atrial appendage closure (LAAc) underwent pre- and postprocedural non-contrast-enhanced cardiac magnetic resonance imaging (CMR). According to the clinical standard, the final position of the occluder device was routinely documented using x-ray fluoroscopy (XR). The accuracy of the IGI system was assessed retrospectively based on the distance of the 3D device marker location derived from the periprocedural XR data and the respective location as identified in the postprocedural CMR data. RESULTS The assessment of the motion-compensation depending accuracy was possible based on the patient data. With motion synchronization, the measured accuracy of the IGI system resulted similar to the estimated accuracy, with almost negligible distances of the device marker positions identified in CMR and XR. Neglection of the cardiac and/or respiratory phase significantly increased the mean distances, with respiratory motion mainly reducing the accuracy with rather low impact on the precision, whereas cardiac motion decreased the accuracy and the precision of the image guidance. CONCLUSIONS In the presented work, the accuracy of the IGI system could be assessed based on in vivo data. Motion consideration clearly showed the potential to increase the accuracy in IGI systems. Where the general decrease in accuracy in non-motion-synchronized data did not come unexpected, a clear difference between cardiac and respiratory motion-induced errors was observed for LAAc data. Since sedation and intervention location close to the large vessels likely impacts the respiratory motion contribution, an intervention-specific accuracy analysis may be useful for other interventions.
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Affiliation(s)
- Dagmar Bertsche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Patrick Metze
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | | | - Ina Vernikouskaya
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
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Contijoch F, Rasche V, Seiberlich N, Peters DC. The future of CMR: All-in-one vs. real-time CMR (Part 2). J Cardiovasc Magn Reson 2024; 26:100998. [PMID: 38237901 DOI: 10.1016/j.jocmr.2024.100998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 01/10/2024] [Indexed: 02/20/2024] Open
Abstract
Cardiac Magnetic Resonance (CMR) protocols can be lengthy and complex, which has driven the research community to develop new technologies to make these protocols more efficient and patient-friendly. Two different approaches to improving CMR have been proposed, specifically "all-in-one" CMR, where several contrasts and/or motion states are acquired simultaneously, and "real-time" CMR, in which the examination is accelerated to avoid the need for breathholding and/or cardiac gating. The goal of this two-part manuscript is to describe these two different types of emerging rapid CMR protocols. To this end, the vision of all-in-one and real-time imaging are described, along with techniques which have been devised and tested along the pathway of clinical implementation. The pros and cons of the different methods are presented, and the remaining open needs of each are detailed. Part 1 tackles the "All-in-One" approaches, and Part 2 focuses on the "Real-Time" approaches along with an overall summary of these emerging methods.
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Affiliation(s)
| | - Volker Rasche
- Ulm University Medical Center, Department of Internal Medicine II, Ulm, Germany
| | - Nicole Seiberlich
- Michigan Institute for Imaging Technology and Translation, Department of Radiology, University of Michigan, Ann Arbor, MI, USA
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Dorneburg C, Galiger C, Stadler GL, Westhoff MA, Rasche V, Barth TFE, Debatin KM, Beltinger C. Inhibition of Survivin Homodimerization Decreases Neuroblastoma Cell Growth. Cancers (Basel) 2023; 15:5775. [PMID: 38136322 PMCID: PMC10741502 DOI: 10.3390/cancers15245775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 11/30/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023] Open
Abstract
Increased expression of BIRC5/survivin, a crucial regulator of the mitotic spindle checkpoint, is associated with poor prognosis in neuroblastoma (NB), the most common extracranial tumor of childhood. Transcriptional inhibitors of survivin have been tested in adult cancers and inhibitors of survivin homodimerization are emerging. We compared genetic inhibition of survivin transcription with the inhibition of survivin homodimerization by S12 and LQZ-7I, chosen from a larger panel of survivin dimerization inhibitors with activity against NB cells. Mice hemizygous for Birc5 were crossed with NB-prone TH-MYCN mice to generate Birc5+/-/MYCNtg/+ mice. The marked decrease of survivin transcription in these mice did not suffice to attenuate the aggressiveness of NB, even when tumors were transplanted into wild-type mice to assure that immune cell function was not compromised by the lack of survivin. In contrast, viability, clonogenicity and anchorage-independent growth of NB cells were markedly decreased by S12. S12 administered systemically to mice with subcutaneous NB xenotransplants decreased intratumoral hemorrhage, albeit not tumor growth. LQZ-7I, which directly targets the survivin dimerization interface, was efficacious in controlling NB cell growth in vitro at markedly lower concentrations compared to S12. LQZ-7I abrogated viability, clonogenicity and anchorage-independent growth, associated with massively distorted mitotic spindle formation. In vivo, LQZ-7I effectively reduced tumor size and cell proliferation of NB cells in CAM assays without apparent toxicity to the developing chick embryo. Collectively, these findings show that inhibiting survivin homodimerization with LQZ-7I holds promise for the treatment of NB and merits further investigation.
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Affiliation(s)
- Carmen Dorneburg
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, 89075 Ulm, Germany; (C.D.); (G.L.S.); (M.-A.W.); (K.-M.D.)
| | - Celimene Galiger
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, 89075 Ulm, Germany; (C.D.); (G.L.S.); (M.-A.W.); (K.-M.D.)
| | - Giovanna L. Stadler
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, 89075 Ulm, Germany; (C.D.); (G.L.S.); (M.-A.W.); (K.-M.D.)
| | - Mike-Andrew Westhoff
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, 89075 Ulm, Germany; (C.D.); (G.L.S.); (M.-A.W.); (K.-M.D.)
| | - Volker Rasche
- Department of Internal Medicine II, University Medical Center Ulm, 89075 Ulm, Germany;
| | - Thomas F. E. Barth
- Department of Pathology, University Medical Center Ulm, 89075 Ulm, Germany;
| | - Klaus-Michael Debatin
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, 89075 Ulm, Germany; (C.D.); (G.L.S.); (M.-A.W.); (K.-M.D.)
| | - Christian Beltinger
- Department of Pediatrics and Adolescent Medicine, University Medical Center Ulm, 89075 Ulm, Germany; (C.D.); (G.L.S.); (M.-A.W.); (K.-M.D.)
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Vernikouskaya I, Müller HP, Roselli F, Ludolph AC, Kassubek J, Rasche V. AI-assisted quantification of hypothalamic atrophy in amyotrophic lateral sclerosis by convolutional neural network-based automatic segmentation. Sci Rep 2023; 13:21505. [PMID: 38057503 PMCID: PMC10700600 DOI: 10.1038/s41598-023-48649-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 11/29/2023] [Indexed: 12/08/2023] Open
Abstract
The hypothalamus is a small structure of the brain with an essential role in metabolic homeostasis, sleep regulation, and body temperature control. Some neurodegenerative diseases such as amyotrophic lateral sclerosis (ALS) and dementia syndromes are reported to be related to hypothalamic volume alterations. Despite its crucial role in human body regulation, neuroimaging studies of this structure are rather scarce due to work-intensive operator-dependent manual delineations from MRI and lack of automated segmentation tools. In this study we present a fully automatic approach based on deep convolutional neural networks (CNN) for hypothalamic segmentation and volume quantification. We applied CNN of U-Net architecture with EfficientNetB0 backbone to allow for accurate automatic hypothalamic segmentation in seconds on a GPU. We further applied our approach for the quantification of the normalized hypothalamic volumes to a large neuroimaging dataset of 432 ALS patients and 112 healthy controls (without the ground truth labels). Using the automated volumetric analysis, we could reproduce hypothalamic atrophy findings associated with ALS by detecting significant volume differences between ALS patients and controls at the group level. In conclusion, a fast and unbiased AI-assisted hypothalamic quantification method is introduced in this study (whose acceptance rate based on the outlier removal strategy was estimated to be above 95%) and made publicly available for researchers interested in the conduction of hypothalamus studies at a large scale.
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Affiliation(s)
- Ina Vernikouskaya
- Department of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081, Ulm, Germany.
| | | | - Francesco Roselli
- Department of Neurology, University of Ulm, Ulm, Germany
- German Center for Neurodegenerative Diseases (DZNE), Ulm, Germany
| | - Albert C Ludolph
- Department of Neurology, University of Ulm, Ulm, Germany
- German Center for Neurodegenerative Diseases (DZNE), Ulm, Germany
| | - Jan Kassubek
- Department of Neurology, University of Ulm, Ulm, Germany
- German Center for Neurodegenerative Diseases (DZNE), Ulm, Germany
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081, Ulm, Germany
- Core Facility Small Animal MRI, University of Ulm, Ulm, Germany
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7
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Haussner F, Maitz A, Rasche V, Hoffmann A, Braumüller S, Lupu L, Ignatius A, Neff TA, Palmer A, Huber-Lang M. INTESTINAL DAMAGE AND IMMUNE RESPONSE AFTER EXPERIMENTAL BLUNT ABDOMINAL TRAUMA. Shock 2023; 60:784. [PMID: 38153806 DOI: 10.1097/shk.0000000000002302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2023]
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Harms M, Fabech Hansson R, Gilg A, Almeida-Hernández Y, Löffler J, Rodríguez-Alfonso A, Habib MMW, Albers D, Ahmed NS, Abadi AH, Winter G, Rasche V, Beer AJ, Weidinger G, Preising N, Ständker L, Wiese S, Sanchez-Garcia E, Zelikin AN, Münch J. Development of N-Terminally Modified Variants of the CXCR4-Antagonistic Peptide EPI-X4 for Enhanced Plasma Stability. J Med Chem 2023; 66:15189-15204. [PMID: 37940118 PMCID: PMC10682998 DOI: 10.1021/acs.jmedchem.3c01128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Indexed: 11/10/2023]
Abstract
EPI-X4, a natural peptide CXCR4 antagonist, shows potential for treating inflammation and cancer, but its short plasma stability limits its clinical application. We aimed to improve the plasma stability of EPI-X4 analogues without compromising CXCR4 antagonism. Our findings revealed that only the peptide N-terminus is prone to degradation. Consequently, incorporating d-amino acids or acetyl groups in this region enhanced peptide stability in plasma. Notably, EPI-X4 leads 5, 27, and 28 not only retained their CXCR4 binding and antagonism but also remained stable in plasma for over 8 h. Molecular dynamic simulations showed that these modified analogues bind similarly to CXCR4 as the original peptide. To further increase their systemic half-lives, we conjugated these stabilized analogues with large polymers and albumin binders. These advances highlight the potential of the optimized EPI-X4 analogues as promising CXCR4-targeted therapeutics and set the stage for more detailed preclinical assessments.
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Affiliation(s)
- Mirja Harms
- Institute
of Molecular Virology, Ulm University Medical
Center, Ulm 89081, Germany
| | - Rikke Fabech Hansson
- Department
of Chemistry and iNANO Interdisciplinary Nanoscience Centre, Aarhus University, Aarhus 8000, Denmark
| | - Andrea Gilg
- Institute
of Molecular Virology, Ulm University Medical
Center, Ulm 89081, Germany
| | - Yasser Almeida-Hernández
- Department
of Biochemical and Chemical Engineering, Computational Bioengineering, Emil-Figge Str. 66, Dortmund 44227, Germany
| | - Jessica Löffler
- Department
of Nuclear Medicine, Ulm University Medical
Center, Ulm 89081, Germany
| | - Armando Rodríguez-Alfonso
- Core
Facility Functional Peptidomics, Ulm University
Medical Center, Ulm 89081, Germany
- Core Unit
Mass Spectrometry and Proteomics, Ulm University
Medical Center, Ulm 89081, Germany
| | - Monica M. W. Habib
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo 11835, Egypt
- Pharmaceutical
Chemistry Department, School of Life and Medical Sciences, University of Hertfordshire Hosted by Global Academic
Foundation, Cairo 11865, Egypt
| | - Dan Albers
- Institute
of Molecular Virology, Ulm University Medical
Center, Ulm 89081, Germany
| | - Nermin S. Ahmed
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo 11835, Egypt
| | - Ashraf H. Abadi
- Department
of Pharmaceutical Chemistry, Faculty of Pharmacy and Biotechnology, German University in Cairo, Cairo 11835, Egypt
| | - Gordon Winter
- Department
of Nuclear Medicine, Ulm University Medical
Center, Ulm 89081, Germany
| | - Volker Rasche
- Experimental
Cardiovascular Imaging (ExCaVI), Ulm University
Medical Center, Ulm 89081, Germany
| | - Ambros J. Beer
- Department
of Nuclear Medicine, Ulm University Medical
Center, Ulm 89081, Germany
| | - Gilbert Weidinger
- Institute
of Biochemistry and Molecular Biology, Ulm
University, Ulm 89081, Germany
| | - Nico Preising
- Core
Facility Functional Peptidomics, Ulm University
Medical Center, Ulm 89081, Germany
| | - Ludger Ständker
- Core
Facility Functional Peptidomics, Ulm University
Medical Center, Ulm 89081, Germany
| | - Sebastian Wiese
- Core Unit
Mass Spectrometry and Proteomics, Ulm University
Medical Center, Ulm 89081, Germany
| | - Elsa Sanchez-Garcia
- Department
of Biochemical and Chemical Engineering, Computational Bioengineering, Emil-Figge Str. 66, Dortmund 44227, Germany
| | - Alexander N. Zelikin
- Department
of Chemistry and iNANO Interdisciplinary Nanoscience Centre, Aarhus University, Aarhus 8000, Denmark
| | - Jan Münch
- Institute
of Molecular Virology, Ulm University Medical
Center, Ulm 89081, Germany
- Core
Facility Functional Peptidomics, Ulm University
Medical Center, Ulm 89081, Germany
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Bertsche D, Pfisterer M, Dahme T, Schneider LM, Metze P, Vernikouskaya I, Rasche V. MRI-based training model for left atrial appendage closure. Int J Comput Assist Radiol Surg 2023; 18:2111-2116. [PMID: 36997829 PMCID: PMC10589139 DOI: 10.1007/s11548-023-02870-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 03/09/2023] [Indexed: 04/01/2023]
Abstract
PURPOSE Percutaneous closure of the left atrial appendage (LAA) reduces the risk of embolic stroke in patients with atrial fibrillation. Thereby, the optimal transseptal puncture (TSP) site differs due to the highly variable anatomical shape of the LAA, which is rarely considered in existing training models. Based on non-contrast-enhanced magnetic resonance imaging (MRI) volumes, we propose a training model for LAA closure with interchangeable and patient-specific LAA enabling LAA-specific identification of the TSP site best suited. METHODS Based on patient-specific MRI data, silicone models of the LAAs were produced using a 3D-printed cast model. In addition, an MRI-derived 3D-printed base model was set up, including the right and left atrium with predefined passages in the septum, mimicking multiple TSP sites. The various silicone models and a tube mimicking venous access were connected to the base model. Empirical use of the model allowed the demonstration of its usability. RESULTS Patient-specific silicone models of the LAA could be generated from all LAA patient MRI datasets. The influence of various combinations regarding TSP sites and LAA shapes could be demonstrated as well as the technical functionality of the occluder system. Via the attached tube mimicking the venous access, the correct handling of the deployment catheter even in case of not optimal puncture site could be practiced. CONCLUSION The proposed contrast-agent and radiation-free MRI-based training model for percutaneous LAA closure enables the pre-interventional assessment of the influence of the TSP site on the access of patient-specific LAA shapes. A straightforward replication of this work is measured by using clinically available imaging protocols and a widespread 3D printer technique to build the model.
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Affiliation(s)
- Dagmar Bertsche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Mona Pfisterer
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Tillman Dahme
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | | | - Patrick Metze
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Ina Vernikouskaya
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
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10
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Bertsche D, Metze P, Luo E, Dahme T, Gonska B, Rottbauer W, Vernikouskaya I, Rasche V, Schneider LM. Cardiac magnetic resonance imaging for preprocedural planning of percutaneous left atrial appendage closure. Front Cardiovasc Med 2023; 10:1132626. [PMID: 37424915 PMCID: PMC10326314 DOI: 10.3389/fcvm.2023.1132626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 06/01/2023] [Indexed: 07/11/2023] Open
Abstract
Introduction Percutaneous closure of the left atrial appendage (LAA) facilitates stroke prevention in patients with atrial fibrillation. Optimal device selection and positioning are often challenging due to highly variable LAA shape and dimension and thus require accurate assessment of the respective anatomy. Transesophageal echocardiography (TEE) and x-ray fluoroscopy (XR) represent the gold standard imaging techniques. However, device underestimation has frequently been observed. Assessment based on 3-dimensional computer tomography (CTA) has been reported as more accurate but increases radiation and contrast agent burden. In this study, the use of non-contrast-enhanced cardiac magnetic resonance imaging (CMR) to support preprocedural planning for LAA closure (LAAc) was investigated. Methods CMR was performed in thirteen patients prior to LAAc. Based on the 3-dimensional CMR image data, the dimensions of the LAA were quantified and optimal C-arm angulations were determined and compared to periprocedural data. Quantitative figures used for evaluation of the technique comprised the maximum diameter, the diameter derived from perimeter and the area of the landing zone of the LAA. Results Perimeter- and area-based diameters derived from preprocedural CMR showed excellent congruency compared to those measured periprocedurally by XR, whereas the respective maximum diameter resulted in significant overestimation (p < 0.05). Compared to TEE assessment, CMR-derived diameters resulted in significantly larger dimensions (p < 0.05). The deviation of the maximum diameter to the diameters measured by XR and TEE correlated well with the ovality of the LAA. C-arm angulations used during the procedures were in agreement with those determined by CMR in case of circular LAA. Discussion This small pilot study demonstrates the potential of non-contrast-enhanced CMR to support preprocedural planning of LAAc. Diameter measurements based on LAA area and perimeter correlated well with the actual device selection parameters. CMR-derived determination of landing zones facilitated accurate C-arm angulation for optimal device positioning.
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Schlett JS, Mettang M, Skaf A, Schweizer P, Errerd A, Mulugeta EA, Hein TM, Tsesmelis K, Tsesmelis M, Büttner UFG, Wendt H, Abaei A, Rasche V, Prex V, Nespoli E, Alami NO, Tews D, Walther P, Yilmazer-Hanke D, Oswald F, Dimou L, Wirth T, Baumann B. NF-κB is a critical mediator of post-mitotic senescence in oligodendrocytes and subsequent white matter loss. Mol Neurodegener 2023; 18:24. [PMID: 37069623 PMCID: PMC10108549 DOI: 10.1186/s13024-023-00616-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 03/25/2023] [Indexed: 04/19/2023] Open
Abstract
BACKGROUND Inflammaging represents an accepted concept where the immune system shifts to a low-grade chronic pro-inflammatory state without overt infection upon aging. In the CNS, inflammaging is mainly driven by glia cells and associated with neurodegenerative processes. White matter degeneration (WMD), a well-known process in the aging brain, manifests in myelin loss finally resulting in motor, sensory and cognitive impairments. Oligodendrocytes (OL) are responsible for homeostasis and maintenance of the myelin sheaths, which is a complex and highly energy demanding process sensitizing these cells to metabolic, oxidative and other forms of stress. Yet, the immediate impact of chronic inflammatory stress like inflammaging on OL homeostasis, myelin maintenance and WMD remains open. METHODS To functionally analyze the role of IKK/NF-κB signaling in the regulation of myelin homeostasis and maintenance in the adult CNS, we established a conditional mouse model allowing NF-κB activation in mature myelinating oligodendrocytes. IKK2-CAPLP-CreERT2 mice were characterized by biochemical, immunohistochemical, ultrastructural and behavioral analyses. Transcriptome data from isolated, primary OLs and microglia cells were explored by in silico pathway analysis and validated by complementary molecular approaches. RESULTS Chronic NF-κB activation in mature OLs leads to aggravated neuroinflammatory conditions phenocopying brain inflammaging. As a consequence, IKK2-CAPLP-CreERT2 mice showed specific neurological deficits and impaired motoric learning. Upon aging, persistent NF-κB signaling promotes WMD in these mice as ultrastructural analysis revealed myelination deficits in the corpus callosum accompanied by impaired myelin protein expression. RNA-Seq analysis of primary oligodendrocytes and microglia cells uncovers gene expression signatures associated with activated stress responses and increased post mitotic cellular senescence (PoMiCS) which was confirmed by elevated senescence-associated β-galactosidase activity and SASP gene expression profile. We identified an elevated integrated stress response (ISR) characterized by phosphorylation of eIF2α as a relevant molecular mechanism which is able to affect translation of myelin proteins. CONCLUSIONS Our findings demonstrate an essential role of IKK/NF-κB signaling in mature, post-mitotic OLs in regulating stress-induced senescence in these cells. Moreover, our study identifies PoMICS as an important driving force of age-dependent WMD as well as of traumatic brain injury induced myelin defects.
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Affiliation(s)
- Judith Stefanie Schlett
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | - Melanie Mettang
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | - Aladdin Skaf
- Molecular and Translational Neuroscience, Department of Neurology, University Medical Center Ulm, 89081, Ulm, Germany
| | - Pavel Schweizer
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | - Alina Errerd
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | | | - Tabea Melissa Hein
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | - Konstantinos Tsesmelis
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | - Miltiadis Tsesmelis
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | - Ulrike F G Büttner
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | - Heinrich Wendt
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | - Alireza Abaei
- Core Facility Small Animal Imaging (CF-SANI), Ulm University, 89081, Ulm, Germany
| | - Volker Rasche
- Core Facility Small Animal Imaging (CF-SANI), Ulm University, 89081, Ulm, Germany
| | - Vivien Prex
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | - Ester Nespoli
- Molecular and Translational Neuroscience, Department of Neurology, University Medical Center Ulm, 89081, Ulm, Germany
| | - Najwa Ouali Alami
- Institute of Clinical Neuroanatomy, Ulm University, Helmholtzstraße 8/1, 89081, Ulm, Germany
| | - Daniel Tews
- Core Facility Extracellular Flux Analyzer, Ulm University Medical Center, 89081, Ulm, Germany
| | - Paul Walther
- Central Facility for Electron Microscopy, Ulm University, 89081, Ulm, Germany
| | - Deniz Yilmazer-Hanke
- Institute of Clinical Neuroanatomy, Ulm University, Helmholtzstraße 8/1, 89081, Ulm, Germany
| | - Franz Oswald
- Department of Internal Medicine I, Center for Internal Medicine, University Medical Center Ulm, 89081, Ulm, Germany
| | - Leda Dimou
- Molecular and Translational Neuroscience, Department of Neurology, University Medical Center Ulm, 89081, Ulm, Germany
| | - Thomas Wirth
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany
| | - Bernd Baumann
- Institute of Physiological Chemistry, Ulm University, Albert- Einstein-Allee 11, 89081, Ulm, Germany.
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12
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Gierse M, Nagel L, Keim M, Lucas S, Speidel T, Lobmeyer T, Winter G, Josten F, Karaali S, Fellermann M, Scheuer J, Müller C, van Heijster F, Skinner J, Löffler J, Parker A, Handwerker J, Marshall A, Salhov A, El-Kassem B, Vassiliou C, Blanchard JW, Picazo-Frutos R, Eills J, Barth H, Jelezko F, Rasche V, Schilling F, Schwartz I, Knecht S. Parahydrogen-Polarized Fumarate for Preclinical in Vivo Metabolic Magnetic Resonance Imaging. J Am Chem Soc 2023; 145:5960-5969. [PMID: 36857421 DOI: 10.1021/jacs.2c13830] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
We present a versatile method for the preparation of hyperpolarized [1-13C]fumarate as a contrast agent for preclinical in vivo MRI, using parahydrogen-induced polarization (PHIP). To benchmark this process, we compared a prototype PHIP polarizer to a state-of-the-art dissolution dynamic nuclear polarization (d-DNP) system. We found comparable polarization, volume, and concentration levels of the prepared solutions, while the preparation effort is significantly lower for the PHIP process, which can provide a preclinical dose every 10 min, opposed to around 90 min for d-DNP systems. With our approach, a 100 mM [1-13C]-fumarate solution of volumes up to 3 mL with 13-20% 13C-hyperpolarization after purification can be produced. The purified solution has a physiological pH, while the catalyst, the reaction side products, and the precursor material concentrations are reduced to nontoxic levels, as confirmed in a panel of cytotoxicity studies. The in vivo usage of the hyperpolarized fumarate as a perfusion agent in healthy mice and the metabolic conversion of fumarate to malate in tumor-bearing mice developing regions with necrotic cell death is demonstrated. Furthermore, we present a one-step synthesis to produce the 13C-labeled precursor for the hydrogenation reaction with high yield, starting from 13CO2 as a cost-effective source for 13C-labeled compounds.
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Affiliation(s)
- Martin Gierse
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany.,Institute for Quantum Optics (IQO) and Center for Integrated Quantum Science and Technology (IQST), Ulm University, 89081 Ulm, Germany
| | - Luca Nagel
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Michael Keim
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany
| | | | - Tobias Speidel
- Core Facility Small Animal MRI, Medical Faculty, Ulm University, 89081 Ulm, Germany
| | - Tobias Lobmeyer
- Core Facility Small Animal MRI, Medical Faculty, Ulm University, 89081 Ulm, Germany
| | - Gordon Winter
- Department of Nuclear Medicine, Ulm University, 89081 Ulm, Germany
| | - Felix Josten
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany
| | - Senay Karaali
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany
| | - Maximilian Fellermann
- Institute of Experimental and Clinical Pharmacology, Toxicology and Pharmacology of Natural Products, University of Ulm Medical Center, 89081 Ulm, Germany
| | | | | | - Frits van Heijster
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Jason Skinner
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Jessica Löffler
- Department of Nuclear Medicine, Ulm University, 89081 Ulm, Germany
| | - Anna Parker
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany
| | | | - Alastair Marshall
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany.,Institute for Quantum Optics (IQO) and Center for Integrated Quantum Science and Technology (IQST), Ulm University, 89081 Ulm, Germany
| | - Alon Salhov
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany.,Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, 91904, Givat Ram, Israel
| | | | | | | | - Román Picazo-Frutos
- Helmholtz-Institut Mainz, GSI Helmholtzzentrum für Schwerionenforschung, Mainz 55128, Germany.,Johannes Gutenberg-Universität Mainz, Mainz 55128, Germany
| | - James Eills
- Institute for Bioengineering of Catalonia, 08028 Barcelona, Spain
| | - Holger Barth
- Institute of Experimental and Clinical Pharmacology, Toxicology and Pharmacology of Natural Products, University of Ulm Medical Center, 89081 Ulm, Germany
| | - Fedor Jelezko
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany.,Institute for Quantum Optics (IQO) and Center for Integrated Quantum Science and Technology (IQST), Ulm University, 89081 Ulm, Germany
| | - Volker Rasche
- Core Facility Small Animal MRI, Medical Faculty, Ulm University, 89081 Ulm, Germany
| | - Franz Schilling
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Ilai Schwartz
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany
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13
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Hilbrig C, Löffler J, Fischer G, Scheidhauer E, Solbach C, Huber-Lang M, Beer AJ, Rasche V, Winter G. Evaluation of the EPR Effect in the CAM-Model by Molecular Imaging with MRI and PET Using 89Zr-Labeled HSA. Cancers (Basel) 2023; 15:cancers15041126. [PMID: 36831469 PMCID: PMC9954539 DOI: 10.3390/cancers15041126] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/01/2023] [Accepted: 02/07/2023] [Indexed: 02/12/2023] Open
Abstract
Mouse models are commonly used to study the biodistribution of novel radioligands, but alternative models corresponding to the 3Rs principles, such as the chorioallantoic membrane (CAM) model, are highly required. While there are promising data from the CAM model regarding target-specific radiolabeled compounds, its utility for assessing macromolecule biodistribution and analyzing the EPR effect remains to demonstrated. Using 89Zr-labeled human serum albumin, the accumulation of nontarget-specific macromolecules in CAM and mouse xenograft models was studied using PET and MRI. Therefore, the radioligand [89Zr]Zr-DFO-HSA was analyzed in both chicken embryos (n = 5) and SCID mice (n = 4), each with TZM-bl and PC-3 tumor entities. Dynamic PET and anatomical MRI, as well as ex vivo biodistribution analyses, were performed to assess ligand distribution over 24 h. Histological staining and autoradiography verified the intratumoral accumulation. The tumors were successfully visualized for CAM and mouse models by PET, and the albumin influx from the blood into the respective tumors did not differ significantly. The accumulation and retention of HSA in tumors due to the EPR effect was demonstrated for both models. These results highlight that the CAM model is a potential alternative to the mouse model for initial studies with novel radiolabeled macromolecules with respect to the 3Rs principles.
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Affiliation(s)
- Colmar Hilbrig
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
- Correspondence: (C.H.); (G.W.)
| | - Jessica Löffler
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
- Center for Translational Imaging, Core Facility Small Animal Imaging, Ulm University, 89081 Ulm, Germany
| | - Gabriel Fischer
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Ellen Scheidhauer
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Christoph Solbach
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Markus Huber-Lang
- Institute for Clinical and Experimental Trauma-Immunology, Ulm University Medical Center, 89081 Ulm, Germany
| | - Ambros J. Beer
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Volker Rasche
- Center for Translational Imaging, Core Facility Small Animal Imaging, Ulm University, 89081 Ulm, Germany
- Department of Internal Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Gordon Winter
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
- Correspondence: (C.H.); (G.W.)
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14
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Carmesin CF, Port F, Böhringer S, Gottschalk KE, Rasche V, Jansen S. Ageing-induced shrinkage of intervessel pit membranes in xylem of Clematis vitalba modifies its mechanical properties as revealed by atomic force microscopy. Front Plant Sci 2023; 14:1002711. [PMID: 36755701 PMCID: PMC9899931 DOI: 10.3389/fpls.2023.1002711] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 01/05/2023] [Indexed: 06/18/2023]
Abstract
Bordered pit membranes of angiosperm xylem are anisotropic, mesoporous media between neighbouring conduits, with a key role in long distance water transport. Yet, their mechanical properties are poorly understood. Here, we aim to quantify the stiffness of intervessel pit membranes over various growing seasons. By applying an AFM-based indentation technique "Quantitative Imaging" we measured the effective elastic modulus (E effective) of intervessel pit membranes of Clematis vitalba in dependence of size, age, and hydration state. The indentation-deformation behaviour was analysed with a non-linear membrane model, and paired with magnetic resonance imaging to visualise sap-filled and embolised vessels, while geometrical data of bordered pits were obtained using electron microscopy. E effective was transformed to the geometrically independent apparent elastic modulus E apparent and to aspiration pressure P b. The material stiffness (E apparent) of fresh pit membranes was with 57 MPa considerably lower than previously suggested. The estimated pressure for pit membrane aspiration was 2.20+28 MPa. Pit membranes from older growth rings were shrunken, had a higher material stiffness and a lower aspiration pressure than current year ones, suggesting an irreversible, mechanical ageing process. This study provides an experimental-stiffness analysis of hydrated intervessel pit membranes in their native state. The estimated aspiration pressure suggests that membranes are not deflected under normal field conditions. Although absolute values should be interpreted carefully, our data suggest that pit membrane shrinkage implies increasing material stiffness, and highlight the dynamic changes of pit membrane mechanics and their complex, functional behaviour for fluid transport.
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Affiliation(s)
- Cora F. Carmesin
- Institute of Systematic Botany and Ecology, Ulm University, Albert-Einstein-Allee 11, Ulm, Germany
| | - Fabian Port
- Institute of Experimental Physics, Ulm University, Albert Einstein Allee 45, Ulm, Germany
| | - Samuel Böhringer
- Institut für Quantenphysik and Center for Integrated Quantum Science and Technology, Universität Ulm, Albert-Einstein-Allee 11, Ulm, Germany
| | | | - Volker Rasche
- Core Facility Small Animal Imaging, Medical Faculty, Ulm University, Ulm, Germany
- Department of Internal Medicine II, Ulm University, Albert Einstein Allee 45, Ulm, Germany
| | - Steven Jansen
- Institute of Systematic Botany and Ecology, Ulm University, Albert-Einstein-Allee 11, Ulm, Germany
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15
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Wanek T, Mairinger S, Raabe M, Alam MNA, Filip T, Stanek J, Winter G, Xu L, Laube C, Weil T, Rasche V, Kuntner C. Synthesis, radiolabeling, and preclinical in vivo evaluation of 68Ga-radiolabelled nanodiamonds. Nucl Med Biol 2023; 116-117:108310. [PMID: 36565646 DOI: 10.1016/j.nucmedbio.2022.108310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 11/29/2022] [Accepted: 12/09/2022] [Indexed: 12/24/2022]
Abstract
PURPOSE Nanodiamonds (NDs) represent a new class of nanoparticles and have gained increasing interest in medical applications. Modifying the surface coating by attaching binding ligands or imaging probes can transform NDs into multi-modal targeting probes. This study evaluated the biokinetics and biodistribution of 68Ga-radiolabelled NDs in a xenograft model. PROCEDURES NDs were coated with an albumin-derived copolymer modified with desferrioxamine to provide a chelator for radiolabeling. In vivo studies were conducted in AR42J tumor-bearing CD1 mice to evaluate biodistribution and tumor accumulation of the NDs. RESULTS Coated NDs were successfully radiolabeled using 68Ga at room temperature with radiolabeling efficiencies up to 91.8 ± 3.2 % as assessed by radio-TLC. In vivo studies revealed the highest accumulation in the liver and spleen, whereas tumor radioactivity concentration was low. CONCLUSIONS Radiolabeling of coated NDs could be achieved. However, the obtained results indicate these coated NDs' limitations in their biodistribution within the conducted studies.
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Affiliation(s)
- Thomas Wanek
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria; Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, Seibersdorf, Austria
| | - Severin Mairinger
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria; Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, Seibersdorf, Austria; Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Marco Raabe
- Max Planck Institute for Polymer Research, Synthesis of Macromolecules, Mainz, Germany; Institute of Inorganic Chemistry I, Ulm University, Ulm, Germany
| | - Md Noor A Alam
- Max Planck Institute for Polymer Research, Synthesis of Macromolecules, Mainz, Germany; Institute of Inorganic Chemistry I, Ulm University, Ulm, Germany
| | - Thomas Filip
- Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, Seibersdorf, Austria; Institute of Animal Breeding and Genetics, University of Veterinary Medicine, Vienna, Austria
| | - Johann Stanek
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria; Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, Seibersdorf, Austria
| | - Gordon Winter
- Department of Nuclear Medicine, Ulm University Medical Center, Ulm, Germany(.)
| | - Lujuan Xu
- Max Planck Institute for Polymer Research, Synthesis of Macromolecules, Mainz, Germany; Institute of Inorganic Chemistry I, Ulm University, Ulm, Germany
| | - Christian Laube
- Leibniz-Institute of Surface Engineering (IOM), Leipzig, Germany
| | - Tanja Weil
- Max Planck Institute for Polymer Research, Synthesis of Macromolecules, Mainz, Germany; Institute of Inorganic Chemistry I, Ulm University, Ulm, Germany
| | - Volker Rasche
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
| | - Claudia Kuntner
- Department of Biomedical Imaging and Image-guided Therapy, Medical University of Vienna, Vienna, Austria; Preclinical Molecular Imaging, AIT Austrian Institute of Technology GmbH, Seibersdorf, Austria.
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16
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Fischer D, Fluegen G, Garcia P, Ghaffari-Tabrizi-Wizsy N, Gribaldo L, Huang RYJ, Rasche V, Ribatti D, Rousset X, Pinto MT, Viallet J, Wang Y, Schneider-Stock R. The CAM Model-Q&A with Experts. Cancers (Basel) 2022; 15:cancers15010191. [PMID: 36612187 PMCID: PMC9818221 DOI: 10.3390/cancers15010191] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 12/20/2022] [Accepted: 12/24/2022] [Indexed: 12/30/2022] Open
Abstract
The chick chorioallantoic membrane (CAM), as an extraembryonic tissue layer generated by the fusion of the chorion with the vascularized allantoic membrane, is easily accessible for manipulation. Indeed, grafting tumor cells on the CAM lets xenografts/ovografts develop in a few days for further investigations. Thus, the CAM model represents an alternative test system that is a simple, fast, and low-cost tool to study tumor growth, drug response, or angiogenesis in vivo. Recently, a new era for the CAM model in immune-oncology-based drug discovery has been opened up. Although there are many advantages offering extraordinary and unique applications in cancer research, it has also disadvantages and limitations. This review will discuss the pros and cons with experts in the field.
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Affiliation(s)
- Dagmar Fischer
- Division of Pharmaceutical Technology, Department of Chemistry and Pharmacy, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
| | - Georg Fluegen
- Department of General, Visceral, Thoracic and Pediatric Surgery (A), Medical Faculty, Heinrich-Heine-University, University Hospital Duesseldorf, 40225 Duesseldorf, Germany
| | - Paul Garcia
- Institute for Advanced Biosciences, Research Center Université Grenoble Alpes (UGA)/Inserm U 1209/CNRS 5309, 38700 La Tronche, France
- R&D Department, Inovotion, 38700 La Tronche, France
| | - Nassim Ghaffari-Tabrizi-Wizsy
- SFL Chicken CAM Lab, Department of Immunology, Otto Loewi Research Center, Medical University of Graz, 8010 Graz, Austria
| | - Laura Gribaldo
- European Commission, Joint Research Centre (JRC), 21027 Ispra, Italy
| | - Ruby Yun-Ju Huang
- School of Medicine, College of Medicine, National Taiwan University, Taipei 10051, Taiwan
- Graduate Institute of Oncology, College of Medicine, National Taiwan University, Taipei 10051, Taiwan
- Department of Obstetrics & Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119077, Singapore
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Center, 89073 Ulm, Germany
| | - Domenico Ribatti
- Department of Translational Biomedicine and Neurosciences, University of Bari “Aldo Moro”, 70124 Bari, Italy
| | | | - Marta Texeira Pinto
- i3S—Instituto de Investigação e Inovação em Saúde, Universidade do Porto, 4200-135 Porto, Portugal
- Ipatimup—Instituto de Patologia e Imunologia Molecular da Universidade do Porto, 4200-135 Porto, Portugal
| | - Jean Viallet
- R&D Department, Inovotion, 38700 La Tronche, France
| | - Yan Wang
- R&D Department, Inovotion, 38700 La Tronche, France
| | - Regine Schneider-Stock
- Experimental Tumorpathology, Institute of Pathology, Universitätsklinikum Erlangen, FAU Erlangen-Nürnberg, 91054 Erlangen, Germany
- Comprehensive Cancer Center Erlangen-EMN (CCC ER-EMN), Universitätsklinikum Erlangen, FAU Erlangen-Nürnberg, 94054 Erlangen, Germany
- Correspondence: ; Tel.: +49-9131-8526-069
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Winter G, Eberhardt N, Löffler J, Raabe M, Alam MNA, Hao L, Abaei A, Herrmann H, Kuntner C, Glatting G, Solbach C, Jelezko F, Weil T, Beer AJ, Rasche V. Preclinical PET and MR Evaluation of 89Zr- and 68Ga-Labeled Nanodiamonds in Mice over Different Time Scales. Nanomaterials (Basel) 2022; 12:4471. [PMID: 36558325 PMCID: PMC9780863 DOI: 10.3390/nano12244471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/06/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
Nanodiamonds (NDs) have high potential as a drug carrier and in combination with nitrogen vacancies (NV centers) for highly sensitive MR-imaging after hyperpolarization. However, little remains known about their physiological properties in vivo. PET imaging allows further evaluation due to its quantitative properties and high sensitivity. Thus, we aimed to create a preclinical platform for PET and MR evaluation of surface-modified NDs by radiolabeling with both short- and long-lived radiotracers. Serum albumin coated NDs, functionalized with PEG groups and the chelator deferoxamine, were labeled either with zirconium-89 or gallium-68. Their biodistribution was assessed in two different mouse strains. PET scans were performed at various time points up to 7 d after i.v. injection. Anatomical correlation was provided by additional MRI in a subset of animals. PET results were validated by ex vivo quantification of the excised organs using a gamma counter. Radiolabeled NDs accumulated rapidly in the liver and spleen with a slight increase over time, while rapid washout from the blood pool was observed. Significant differences between the investigated radionuclides were only observed for the spleen (1 h). In summary, we successfully created a preclinical PET and MR imaging platform for the evaluation of the biodistribution of NDs over different time scales.
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Affiliation(s)
- Gordon Winter
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Nina Eberhardt
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Jessica Löffler
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
- Department of Internal Medicine II, Experimental Cardiovascular Imaging, Ulm University Medical Center, 89081 Ulm, Germany
| | - Marco Raabe
- Department of Synthesis of Macromolecules, Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Md. Noor A. Alam
- Department of Synthesis of Macromolecules, Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Li Hao
- Department of Internal Medicine II, Experimental Cardiovascular Imaging, Ulm University Medical Center, 89081 Ulm, Germany
| | - Alireza Abaei
- Department of Internal Medicine II, Experimental Cardiovascular Imaging, Ulm University Medical Center, 89081 Ulm, Germany
| | - Hendrik Herrmann
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Claudia Kuntner
- Department of Biomedical Imaging and Image-Guided Therapy, Medical University Vienna, 1090 Vienna, Austria
| | - Gerhard Glatting
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Christoph Solbach
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Fedor Jelezko
- Institute for Quantum Optics, Ulm University, 89081 Ulm, Germany
| | - Tanja Weil
- Department of Synthesis of Macromolecules, Max Planck Institute for Polymer Research, 55128 Mainz, Germany
| | - Ambros J. Beer
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany
| | - Volker Rasche
- Department of Internal Medicine II, Experimental Cardiovascular Imaging, Ulm University Medical Center, 89081 Ulm, Germany
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Huch B, Stumpf K, Bracher AK, Rasche V, Vogele D, Schütz C, Janda A, Beer M, Neubauer H. Intravoxel incoherent motion (IVIM) MRI in pediatric patients with synovitis of the knee joint: a prospective pilot study. Pediatr Rheumatol Online J 2022; 20:99. [PMID: 36384772 PMCID: PMC9670529 DOI: 10.1186/s12969-022-00756-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 10/28/2022] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Diagnosing synovial inflammation by administration of gadolinium-based contrast agents is limited by invasiveness and possible side effects, especially in children and adolescents. PURPOSE We investigated diagnostic accuracy of diffusion-weighted (DWI) MRI with intravoxel incoherent motion (IVIM) imaging compared to contrast-enhanced MRI for detecting synovitis of the knee in a population of pediatrics and young adults. In addition we compared quantitative measures of synovial diffusion and perfusion to a group of healthy volunteers. METHODS In this prospective study, 8 pediatric patients with 10 symptomatic knees (6 girls and 2 boys, mean age 13 years) with known or suspected synovitis underwent pre- and post-contrast 3.0 T MRI of the knee joint and additional DWI sequences between October 2016 and July 2019. For comparison we enrolled 5 healthy young adults (2 women and 3 men, median age 27 years) with contrast-free MRI of both knees. Post-contrast T1w images and DWI images at b = 1000s/mm2 with apparent diffusion coefficient (ADC) maps of patients were separately rated by two independent and blinded readers with different levels of experience for the presence or absence and degree of synovitis along with the level of confidence. We measured signal intensity on DWI of synovium, joint effusion and muscle with regions of interests and calculated the IVIM-parameters tissue diffusion coefficient (D) and perfusion fraction (f) for patients and volunteers. RESULTS All patients showed at least some synovial contrast enhancement, 8 (80%) children knees were diagnosed with synovitis on contrast-enhanced (= ce)-T1w, the diagnostic standard. Ratings by the first and second reader on ce-T1w and DWI showed full agreement (kappa = 1) in diagnosing synovitis and substantial agreement (k = 0,655) for the degree of synovial enhancement. Interobserver agreement on DWI showed fair agreement (k = 0,220) between both readers. Diagnostic confidence was lower on DWI. Mean D- and f-values of muscle was comparable between patients and volunteers. Effusion mean D was higher, mean f was lower, synovial mean D was lower, mean f higher in patients than in volunteers. All differences were statistically significant (p < 0.001). CONCLUSIONS Diffusion-weighted MRI with IVIM imaging remains a promising, though reader-dependent alternative to i.v. contrast-enhanced imaging in pediatric patients to reliably diagnose, or rule out, synovitis of the knee joint. We detected significantly restricted synovial diffusion and increased perfusion in patients compared to healthy volunteers. TRIAL REGISTRATION Ethical Comitee University Hospital Ulm, Nr. 320/16.
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Affiliation(s)
- Britta Huch
- Department of Diagnostic and Interventional Radiology, University Hospital Ulm, Albert-Einstein-Allee 23, 89081, Ulm, Germany.
| | - Kilian Stumpf
- grid.410712.10000 0004 0473 882XDepartment of Internal Medicine II, Experimental Cardiovascular Imaging, University Hospital Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany
| | - Anna-Katinka Bracher
- grid.410712.10000 0004 0473 882XDepartment of Diagnostic and Interventional Radiology, University Hospital Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany
| | - Volker Rasche
- grid.410712.10000 0004 0473 882XDepartment of Internal Medicine II, Experimental Cardiovascular Imaging, University Hospital Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany
| | - Daniel Vogele
- grid.410712.10000 0004 0473 882XDepartment of Diagnostic and Interventional Radiology, University Hospital Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany
| | - Catharina Schütz
- grid.4488.00000 0001 2111 7257Department of Pediatrics, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Aleš Janda
- grid.410712.10000 0004 0473 882XDepartment of Pediatric and Adolescent Medicine, University Hospital Ulm, Eythstrasse 24, 89075 Ulm, Germany
| | - Meinrad Beer
- grid.410712.10000 0004 0473 882XDepartment of Diagnostic and Interventional Radiology, University Hospital Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany
| | - Henning Neubauer
- grid.410712.10000 0004 0473 882XDepartment of Diagnostic and Interventional Radiology, University Hospital Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany ,SRH Clinic of Radiology, Albert-Schweitzer-Strasse 2, 98527 Suhl, Germany
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Bertsche D, Rottbauer W, Rasche V, Buckert D, Markovic S, Metze P, Gonska B, Luo E, Dahme T, Vernikouskaya I, Schneider LM. Computed tomography angiography/magnetic resonance imaging-based preprocedural planning and guidance in the interventional treatment of structural heart disease. Front Cardiovasc Med 2022; 9:931959. [PMID: 36324746 PMCID: PMC9620519 DOI: 10.3389/fcvm.2022.931959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 09/28/2022] [Indexed: 11/18/2022] Open
Abstract
Preprocedural planning and periprocedural guidance based on image fusion are widely established techniques supporting the interventional treatment of structural heart disease. However, these two techniques are typically used independently. Previous works have already demonstrated the benefits of integrating planning details into image fusion but are limited to a few applications and the availability of the proprietary tools used. We propose a vendor-independent approach to integrate planning details into periprocedural image fusion facilitating guidance during interventional treatment. In this work, we demonstrate the feasibility of integrating planning details derived from computer tomography and magnetic resonance imaging into periprocedural image fusion with open-source and commercially established tools. The integration of preprocedural planning details into periprocedural image fusion has the potential to support safe and efficient interventional treatment of structural heart disease.
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Yang B, Metze P, Balasch A, Stumpf K, Beer M, Rottbauer W, Rasche V. Reproducibility of functional lung parameters derived from free-breathing non-contrast-enhanced 2D ultrashort echo-time. Quant Imaging Med Surg 2022; 12:4720-4733. [PMID: 36185060 PMCID: PMC9511423 DOI: 10.21037/qims-22-92] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Accepted: 06/30/2022] [Indexed: 11/12/2022]
Abstract
Background Imaging the lung parenchyma with magnetic resonance imaging (MRI) is challenging due to cardiac and respiratory motion, the low proton density and short T2* relaxation time, and therefore not well established in the clinical routine. As a further step in facilitating lung MRI for longitudinal monitoring, this study aimed to assess the reproducibility of 2D ultrashort echo time (UTE)-derived lung function parameters in healthy subjects. Methods In this study, a 2D UTE technique was combined with tiny golden angle (tyGA) ordering. Data were acquired either during breath-holds (BH) or continuously during free-breathing (FB) at a field strength of 3T. Retrospective self-gating (image- and k-space-based) was used to reconstruct respiratory and cardiac multistage images from the FB acquisitions. The reproducibility of functional lung parameters derived from BH and FB acquisitions was assessed for three independent examinations (M1–3). M1 and M2 were acquired within 2 h, whereas M3 was acquired at least 14 d after M1/2. Different respiratory and cardiac phases were reconstructed for three coronal slices. Quantitative analysis including proton fraction (fP), apparent signal-to-noise ratio (apparent SNR), fractional ventilation (FV), and perfusion (f) was performed by two independent observers, and inter-measurement and inter-observer repeatability were assessed. Results All scans could be performed successfully in all volunteers. Intraclass correlation coefficients (ICC) of inter-measurement and inter-observer variability, and Bland-Altman analysis showed good to very good reproducibility. Larger breathing amplitudes were observed in the BH acquisitions, which also showed lower reproducibility when compared with the FB acquisitions. For the FB approach, the ICC ranged between 0.70 and 0.98 for all measurements, and ranged between 0.86 and 0.97 for the two observers. No bias or significant differences were observed between the three measurements or the two observers in healthy volunteers. Conclusions The study proves the feasibility of FB 2D tyGA UTE for lung imaging. Functional parameters derived from FB acquisitions are reproducible in healthy volunteers, allowing for further investigation of this technique in patients with various underlying diseases.
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Affiliation(s)
- Bingjie Yang
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
| | - Patrick Metze
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
| | - Anke Balasch
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
| | - Kilian Stumpf
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
| | - Meinrad Beer
- Department of Radiology, Ulm University Medical Centre, Ulm, Germany
| | - Wolfgang Rottbauer
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
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21
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Bertsche D, Rasche V, Rottbauer W, Vernikouskaya I. 3D localization from 2D X-ray projection. Int J Comput Assist Radiol Surg 2022; 17:1553-1558. [PMID: 35819654 PMCID: PMC9463320 DOI: 10.1007/s11548-022-02709-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 06/21/2022] [Indexed: 11/28/2022]
Abstract
PURPOSE Most cardiology procedures are guided using X-ray (XR) fluoroscopy. However, the projective nature of the XR fluoroscopy does not allow for true depth perception as required for safe and efficient intervention guidance in structural heart diseases. For improving guidance, different methods have been proposed often being radiation-intensive, time-consuming, or expensive. We propose a simple 3D localization method based on a single monoplane XR projection using a co-registered centerline model. METHODS The method is based on 3D anatomic surface models and corresponding centerlines generated from preprocedural imaging. After initial co-registration, 2D working points identified in monoplane XR projections are localized in 3D by minimizing the angle between the projection lines of the centerline points and the working points. The accuracy and reliability of the located 3D positions were assessed in 3D using phantom data and in patient data projected to 2D obtained during placement of embolic protection system in interventional procedures. RESULTS With the proposed methods, 2D working points identified in monoplane XR could be successfully located in the 3D phantom and in the patient-specific 3D anatomy. Accuracy in the phantom (3D) resulted in 1.6 mm (± 0.8 mm) on average, and 2.7 mm (± 1.3 mm) on average in the patient data (2D). CONCLUSION The use of co-registered centerline models allows reliable and accurate 3D localization of devices from a single monoplane XR projection during placement of the embolic protection system in TAVR. The extension to different vascular interventions and combination with automatic methods for device detection and registration might be promising.
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Affiliation(s)
- Dagmar Bertsche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Wolfgang Rottbauer
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Ina Vernikouskaya
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
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22
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Vernikouskaya I, Bertsche D, Rottbauer W, Rasche V. Deep learning-based framework for motion-compensated image fusion in catheterization procedures. Comput Med Imaging Graph 2022; 98:102069. [PMID: 35576863 DOI: 10.1016/j.compmedimag.2022.102069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 03/23/2022] [Accepted: 04/18/2022] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Augmenting X-ray (XR) fluoroscopy with 3D anatomic overlays is an essential technique to improve the guidance of the catheterization procedures. Unfortunately, cardiac and respiratory motion compromises the augmented fluoroscopy. Motion compensation methods can be applied to update the overlay of a static model with regard to respiratory and cardiac motion. We investigate the feasibility of motion detection between two fluoroscopic frames by applying a convolutional neural network (CNN). Its integration in the existing open-source software framework 3D-XGuide is demonstrated, such extending its functionality to automatic motion detection and compensation. METHODS The CNN is trained on reference data generated from tracking of the rapid pacing catheter tip by applying template matching with normalized cross-correlation (CC). The developed CNN motion compensation model is packaged in a standalone web service, allowing for independent use via a REST API. For testing and demonstration purposes, we have extended the functionality of 3D-XGuide navigation framework by an additional motion compensation module, which uses the displacement predictions of the standalone CNN model service for motion compensation of the static 3D model overlay. We provide the source code on GitHub under BSD license. RESULTS The performance of the CNN motion compensation model was evaluated on a total of 1690 fluoroscopic image pairs from ten clinical datasets. The CNN model-based motion compensation method clearly overperformed the tracking of the rapid pacing catheter tip with CC with prediction frame rates suitable for live application in the clinical setting. CONCLUSION A novel CNN model-based method for automatic motion compensation during fusion of 3D anatomic models with XR fluoroscopy is introduced and its integration with a real software application demonstrated. Automatic motion extraction from 2D XR images using a CNN model appears as a substantial improvement for reliable augmentation during catheter interventions.
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Affiliation(s)
- Ina Vernikouskaya
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Dagmar Bertsche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Wolfgang Rottbauer
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
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Nita N, Kersten J, Pott A, Weber F, Tesfay T, Benea MT, Metze P, Li H, Rottbauer W, Rasche V, Buckert D. Real-Time Spiral CMR Is Superior to Conventional Segmented Cine-Imaging for Left-Ventricular Functional Assessment in Patients with Arrhythmia. J Clin Med 2022; 11:jcm11082088. [PMID: 35456181 PMCID: PMC9025940 DOI: 10.3390/jcm11082088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/29/2022] [Accepted: 04/06/2022] [Indexed: 02/04/2023] Open
Abstract
(1) Background: Segmented Cartesian Cardiovascular magnetic resonance (CMR) often fails to deliver robust assessment of cardiac function in patients with arrhythmia. We aimed to assess the performance of a tiny golden-angle spiral real-time CMR sequence at 1.5 T for left-ventricular (LV) volumetry in patients with irregular heart rhythm; (2) Methods: We validated the real-time sequence against the standard breath-hold segmented Cartesian sequence in 32 patients, of whom 11 presented with arrhythmia. End-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV), and ejection fraction (EF) were assessed. In arrhythmic patients, real-time and standard Cartesian acquisitions were compared against a reference echocardiographic modality; (3) Results: In patients with sinus rhythm, good agreements and correlations were found between the segmented and real-time methods, with only minor, non-significant underestimation of EDV for the real-time sequence (135.95 ± 30 mL vs. 137.15 ± 31, p = 0.164). In patients with arrhythmia, spiral real-time CMR yielded superior image quality to the conventional segmented imaging, allowing for excellent agreement with the reference echocardiographic volumetry. In contrast, in this cohort, standard Cartesian CMR showed significant underestimation of LV-ESV (106.72 ± 63.51 mL vs. 125.47 ± 72.41 mL, p = 0.026) and overestimation of LVEF (42.96 ± 10.81% vs. 39.02 ± 11.72%, p = 0.039); (4) Conclusions: Real-time spiral CMR improves image quality in arrhythmic patients, allowing reliable assessment of LV volumetry.
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Affiliation(s)
- Nicoleta Nita
- Department of Internal Medicine II, University Medical Center, 89081 Ulm, Germany; (J.K.); (A.P.); (F.W.); (T.T.); (P.M.); (H.L.); (W.R.); (V.R.); (D.B.)
- Correspondence:
| | - Johannes Kersten
- Department of Internal Medicine II, University Medical Center, 89081 Ulm, Germany; (J.K.); (A.P.); (F.W.); (T.T.); (P.M.); (H.L.); (W.R.); (V.R.); (D.B.)
| | - Alexander Pott
- Department of Internal Medicine II, University Medical Center, 89081 Ulm, Germany; (J.K.); (A.P.); (F.W.); (T.T.); (P.M.); (H.L.); (W.R.); (V.R.); (D.B.)
| | - Fabian Weber
- Department of Internal Medicine II, University Medical Center, 89081 Ulm, Germany; (J.K.); (A.P.); (F.W.); (T.T.); (P.M.); (H.L.); (W.R.); (V.R.); (D.B.)
| | - Temsgen Tesfay
- Department of Internal Medicine II, University Medical Center, 89081 Ulm, Germany; (J.K.); (A.P.); (F.W.); (T.T.); (P.M.); (H.L.); (W.R.); (V.R.); (D.B.)
| | | | - Patrick Metze
- Department of Internal Medicine II, University Medical Center, 89081 Ulm, Germany; (J.K.); (A.P.); (F.W.); (T.T.); (P.M.); (H.L.); (W.R.); (V.R.); (D.B.)
| | - Hao Li
- Department of Internal Medicine II, University Medical Center, 89081 Ulm, Germany; (J.K.); (A.P.); (F.W.); (T.T.); (P.M.); (H.L.); (W.R.); (V.R.); (D.B.)
| | - Wolfgang Rottbauer
- Department of Internal Medicine II, University Medical Center, 89081 Ulm, Germany; (J.K.); (A.P.); (F.W.); (T.T.); (P.M.); (H.L.); (W.R.); (V.R.); (D.B.)
| | - Volker Rasche
- Department of Internal Medicine II, University Medical Center, 89081 Ulm, Germany; (J.K.); (A.P.); (F.W.); (T.T.); (P.M.); (H.L.); (W.R.); (V.R.); (D.B.)
| | - Dominik Buckert
- Department of Internal Medicine II, University Medical Center, 89081 Ulm, Germany; (J.K.); (A.P.); (F.W.); (T.T.); (P.M.); (H.L.); (W.R.); (V.R.); (D.B.)
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Balasch A, Metze P, Li H, Rottbauer W, Abaei A, Rasche V. Tiny golden angle ultrashort echo-time lung imaging in mice. NMR Biomed 2021; 34:e4591. [PMID: 34322941 DOI: 10.1002/nbm.4591] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 06/25/2021] [Accepted: 07/04/2021] [Indexed: 06/13/2023]
Abstract
Imaging the lung parenchyma with MRI is particularly difficult in small animals due to the high respiratory and heart rates, and ultrashort T2* at high magnetic field strength caused by the high susceptibilities induced by the air-tissue interfaces. In this study, a 2D ultrashort echo-time (UTE) technique was combined with tiny golden angle (tyGA) ordering. Data were acquired continuously at 11.7 T and retrospective center-of-k-space gating was applied to reconstruct respiratory multistage images. Lung (proton) density (fP ), T2*, signal-to-noise ratio (SNR), fractional ventilation (FV) and perfusion (f) were quantified, and the application to dynamic contrast agent (CA)-enhanced (DCE) qualitative perfusion assessment tested. The interobserver and intraobserver and interstudy reproducibility of the quantitative parameters were investigated. High-quality images of the lung parenchyma could be acquired in all animals. Over all lung regions a mean T2* of 0.20 ± 0.05 ms was observed. FV resulted as 0.31 ± 0.13, and a trend towards lower SNR values during inspiration (EX: SNR = 12.48 ± 6.68, IN: SNR = 11.79 ± 5.86) and a significant (P < 0.001) decrease in lung density (EX: fP = 0.69 ± 0.13, IN: fP = 0.62 ± 0.13) were observed. Quantitative perfusion results as 34.63 ± 9.05 mL/cm3 /min (systole) and 32.77 ± 8.55 mL/cm3 /min (diastole) on average. The CA dynamics could be assessed and, because of the continuous nature of the data acquisition, reconstructed at different temporal resolutions. Where a good to excellent interobserver reproducibility and an excellent intraobserver reproducibility resulted, the interstudy reproducibility was only fair to good. In conclusion, the combination of tiny golden angles with UTE (2D tyGA UTE) resulted in a reliable imaging technique for lung morphology and function in mice, providing uniform k-space coverage and thus low-artefact images of the lung parenchyma after gating.
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Affiliation(s)
- Anke Balasch
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
| | - Patrick Metze
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
| | - Hao Li
- Department of Cardiology, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Shandong Medicine and Health Key Laboratory of Cardiac Electrophysiology and Arrhythmia, People's Republic of China
- Core Facility Small Animal Imaging (CF-SANI), Ulm University, Ulm, Germany
| | - Wolfgang Rottbauer
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
| | - Alireza Abaei
- Core Facility Small Animal Imaging (CF-SANI), Ulm University, Ulm, Germany
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
- Core Facility Small Animal Imaging (CF-SANI), Ulm University, Ulm, Germany
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Abkai C, Hourfar J, Glockengießer J, Ulrici J, Hell E, Rasche V, Ludwig B. Ultra short time to Echo (UTE) MRI for cephalometric analysis-Potential of an x-ray free fast cephalometric projection technique. PLoS One 2021; 16:e0257224. [PMID: 34516568 PMCID: PMC8437275 DOI: 10.1371/journal.pone.0257224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 04/18/2021] [Indexed: 12/03/2022] Open
Abstract
OBJECTIVES A novel magnetic resonance imaging (MRI) scan protocol is presented on the basis of ultra-short time to echo (UTE). By this MRI cephalometric projections (MCPs) can be acquired without the need of post processing in one shot. Different technical parameterizations of the protocol are performed. Their impact on the performance of MCPs is evaluated in comparison to the gold standard-the lateral cephalometric radiography (LCR) for cephalometric analysis (CA) in orthodontics. METHODS Seven MCPs with various scan parameters influencing the scan duration and one LCR are used from one subject. 40 expert assessors performed CA for 14 predefined cephalometric landmarks. Relative metric distances and absolute angular measurements were calculated. Statistical analysis is presented and the deviations are highlighted to demonstrate the potential of the method for further analysis. RESULTS The MCPs are acquired in 5-154 seconds, depending on resolution and contrast. Mean relative distances were 2.4-2.7 mm in MCPs and 1.6 mm in LCR, which demonstrate the accuracy and level of agreement of the expert assessors in identifying anatomical landmarks. In comparison to other studies, the presented MCP performed similar in angular analysis and demonstrated on average deviation of 1.2° ±1.1° in comparison to LCR. Despite the point articulare (Ar) and the related gonial angle the calculate distances and angles show outcomes in the range of ±2°/2mm. CONCLUSIONS MCPs can be acquired much faster in comparison to other techniques known from literature for CA. This study demonstrated the potential of the new method and showed first feasible results. Further research is needed to analyze the performance on a broad range of patients.
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Affiliation(s)
- Ciamak Abkai
- Dental office, Traben-Trarbach, Germany
- Sirona Dental Systems GmbH, Bensheim, Germany
| | - Jan Hourfar
- Department of Orthodontics, Saarland University, Homburg/Saar, Germany
| | | | | | - Erich Hell
- Sirona Dental Systems GmbH, Bensheim, Germany
| | - Volker Rasche
- Department of Internal Medicine II, Ulm-University, Ulm, Germany
| | - Björn Ludwig
- Dental office, Traben-Trarbach, Germany
- Department of Orthodontics, Saarland University, Homburg/Saar, Germany
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Bertsche D, Keßler M, Buckert D, Schneider LM, Rottbauer W, Rasche V, Markovic S, Vernikouskaya I. How to improve navigation during cardioband transcatheter tricuspid annuloplasty. Eur Heart J Cardiovasc Imaging 2021; 22:611-613. [PMID: 33471099 DOI: 10.1093/ehjci/jeab002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Indexed: 11/12/2022] Open
Affiliation(s)
- Dagmar Bertsche
- Department of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081, Ulm, Germany
| | - Mirjam Keßler
- Department of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081, Ulm, Germany
| | - Dominik Buckert
- Department of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081, Ulm, Germany
| | - Leonhard-Moritz Schneider
- Department of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081, Ulm, Germany
| | - Wolfgang Rottbauer
- Department of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081, Ulm, Germany
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081, Ulm, Germany
| | - Sinisa Markovic
- Department of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081, Ulm, Germany
| | - Ina Vernikouskaya
- Department of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081, Ulm, Germany
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Buckert D, Belal A, Seidl A, Rottbauer W, Thiele H, Rasche V, Wöhrle J. Acute phase segmental radial strain correlates with recovery and late gadolinium extent in ST-elevation myocardial infarction (STEMI): analysis of the abciximab intracoronary versus intravenously drug application in STEMI substudy. Quant Imaging Med Surg 2021; 11:3595-3603. [PMID: 34341734 DOI: 10.21037/qims-21-56] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 03/22/2021] [Indexed: 11/06/2022]
Abstract
Background The role of regional strain evaluation in patients with acute reperfused ST-elevation myocardial infarction (STEMI) is not well determined. The objective of this study was the description of regional strain characteristics in the acute and chronic phase of myocardial infarction and its correlation with symptom-to-balloon time and final extent of myocardial scar assessed by cardiac magnetic resonance imaging. Methods The study cohort has been derived from the randomized controlled Abciximab Intracoronary versus Intravenously Drug Application in STEMI (AIDA STEMI) trial enrolled at the University of Ulm. All patients received comprehensive cardiac magnetic resonance imaging examinations in the acute phase and 6 months later. Results There was a significant improvement of all global deformation indices over time (global longitudinal strain: -13.1%±5.1% to -15.5%±5.8%, P=0.001; global circumferential strain: -14.4%±3.7% to -16.8%±3.6%, P<0.0001; global radial strain: 28.1%±8.7% to 31.9%±9.2%, P=0.0002). Mean radial strain of ischemic segments significantly improved (16.6%±10.8% to 23.7%±12.8%, P<0.0001), while mean radial strain of remote segments remained unchanged (40.2%±9.4% to 39.4%±9.4%, P=0.570). There was a significant correlation between acute phase radial strain of ischemic segments and either symptom-to-balloon time (P=0.013), as well as extent of late gadolinium enhancement at follow-up (P<0.0001). Using a cut-off of ≤27%, acute phase radial strain predicted infarction of the corresponding segment with high sensitivity and specificity (74.4% and 69.0% respectively, P<0.001). Conclusions Segmental radial strain in the acute phase of infarction showed a significant correlation to either symptom-to-balloon-time and the extent of late gadolinium enhancement at follow-up, thus potentially serving as early surrogate for left ventricular remodeling and outcome in STEMI.
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Affiliation(s)
- Dominik Buckert
- Department of Internal Medicine II, University Hospital Ulm, Ulm, Germany
| | - Awad Belal
- Department of Internal Medicine II, University Hospital Ulm, Ulm, Germany
| | - Adrian Seidl
- Department of Internal Medicine II, University Hospital Ulm, Ulm, Germany
| | - Wolfgang Rottbauer
- Department of Internal Medicine II, University Hospital Ulm, Ulm, Germany
| | - Holger Thiele
- Heart Center Leipzig at University of Leipzig and Leipzig Heart Institute, Leipzig, Germany
| | - Volker Rasche
- Department of Internal Medicine II, University Hospital Ulm, Ulm, Germany
| | - Jochen Wöhrle
- Department of Cardiology, Medical Campus Lake Constance, Friedrichshafen, Germany
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Hüfken T, Arbogast JM, Bracher AK, Beer M, Neubauer H, Rasche V. Accelerated model-based quantitative diffusion MRI: A feasibility study for musculoskeletal application. Z Med Phys 2021; 32:240-247. [PMID: 34175164 PMCID: PMC9948881 DOI: 10.1016/j.zemedi.2021.04.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/17/2021] [Accepted: 04/13/2021] [Indexed: 12/25/2022]
Abstract
PURPOSE To develop a model-based reconstruction technique for diffusion quantification based on accelerated two-dimensional echo planar data, obtained with multiple b-weightings. In combination with a dedicated undersampling pattern, acceleration factors above three were proven feasible in a clinical setting. METHODS The proposed model-based method minimizes a cost function considering the l2-norm of the difference between the Fourier transformation of a synthetic diffusion-model-generated k-space and the measured k-space data. Further regularization is performed by introduction of a total variation (TV) constraint to the cost function. Acceleration is achieved by a non-random undersampling pattern using acceleration factors that correspond to the total number of b-values. A rectangular region of variable size, centered in k-space, remains fully sampled for correction of phase variations, introduced by the different diffusion-encoding strengths. RESULTS Qualitative analysis of the resulting images (S0 and ADC) demonstrates the potential of the suggested undersampling pattern in combination with a model-based iterative reconstruction. An edge analysis highlights the preservation of high-frequency information for all investigated undersampling factors. In comparison to a conventional SENSE-accelerated reconstruction, the quantitative analysis of the ADC maps revealed a significantly (P<0.05) superior performance of the suggested technique, enabling acceleration factors of R=3.65 without compromising diffusion data fidelity. CONCLUSION The presented work shows the potential of model-based ADC quantification, which, in combination with a suited undersampling pattern for multiple b-values, enables more than three-fold acceleration using two-dimensional EPI without sacrificing ADC fidelity.
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Affiliation(s)
- Thomas Hüfken
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, BW, Germany
| | - Jannik M. Arbogast
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, BW, Germany
| | | | - Meinrad Beer
- Department of Radiology, Ulm University Medical Center, Ulm, BW, Germany
| | - Henning Neubauer
- Department of Radiology, Ulm University Medical Center, Ulm, BW, Germany
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, BW, Germany.
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Qu YY, Buckert D, Ma GS, Rasche V. Quantitative Assessment of Left and Right Atrial Strains Using Cardiovascular Magnetic Resonance Based Tissue Tracking. Front Cardiovasc Med 2021; 8:690240. [PMID: 34250043 PMCID: PMC8264056 DOI: 10.3389/fcvm.2021.690240] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 05/31/2021] [Indexed: 11/13/2022] Open
Abstract
Background: Left and right atrium (LA and RA) exert an essential and dynamic role in ventricular filling and hence affect heart performance. Strain quantification has been reported as a novel parameter to assess function. However, the assessment of bi-atrial strains with cardiovascular magnetic resonance (CMR) based techniques is still limited and gender- and age-specific normal values in a healthy population are missing. Methods: One hundred and fifty healthy volunteers (49.8 ± 17.3 years, 75 males) undergoing 1.5 Tesla CMR examination were retrospectively and consecutively recruited. LA and RA free wall (RAFW) radial and longitudinal strains (RS and LS) associated with atrial reservoir, conduit and booster pump functions were evaluated with CMR based tissue tracking (CMR-TT) technique. Results: The reservoir, conduit and pump LS resulted as 30.7 ± 10.2%, 19.5 ± 8.2%, 10.9 ± 3.7% for LA, and 52.2 ± 17.6%, 33.3 ± 14.2%, 19.1 ± 8.5% for RAFW, respectively. The amplitude of RA strains was significantly larger than that of LA strains, except for conduit RS. With the increase of age, the decrement of majority of reservoir and conduit strains were observed, while pump strains remained unaffected. Females presented with significantly larger RAFW strains compared with males, especially in the elderly. In addition to the positive correlation between atrial strains and emptying fraction, the negative correlation between atrial strains and volume index was also confirmed. Intra-observer reproducibility of LA strains was superior to RAFW strains (coefficient of variation: 10.12–17.04% vs. 10.80–27.36%, respectively), and the measurement of reservoir and conduit strains was more reproducible in comparison with pump strain. Conclusion: CMR-TT is a feasible and reproducible technique to quantify LA and RA strains and determine atrial phasic functions. The existence of age- and gender-related difference of strains suggests the necessity to establish specific normal values for individual populations.
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Affiliation(s)
- Yang-Yang Qu
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany.,Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Dominik Buckert
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Gen-Shan Ma
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Volker Rasche
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany
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Balasch A, Büttner MS, Metze P, Stumpf K, Beer M, Rottbauer W, Rasche V. Tiny golden angle stack-of-stars (tygaSoS) free-breathing functional lung imaging. Magn Reson Imaging 2021; 82:24-30. [PMID: 34153438 DOI: 10.1016/j.mri.2021.06.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Revised: 04/21/2021] [Accepted: 06/15/2021] [Indexed: 11/26/2022]
Abstract
PURPOSE MRI of the lung parenchyma is still challenging due to cardiac and respiratory motion, and the low proton density and short T2*. Clinical feasible MRI methods for functional lung assessment are of great interest. It was the objective of this study to evaluate the potential of combining the ultra-short echo-time stack-of-stars approach with tiny golden angle (tyGASoS) profile ordering for self-gated free-breathing lung imaging. METHODS Free-breathing tyGASoS data were acquired in 10 healthy volunteers (3 smoker (S), 7 non-smoker (NS)). Images in different respiratory phases were reconstructed applying an image-based self-gating technique. Resulting image quality and sharpness, and parenchyma visibility were qualitatively scored by three blinded independent reader, and the signal-to-noise ratio (SNR), proton fraction (fP) and fractional ventilation (FV) quantified. RESULT The imaging protocol was well tolerated by all volunteers. Image quality was sufficient for subsequent quantitative analysis in all cases with good to excellent inter-reader reliability. Between expiration (EX) and inspiration (IN) significant differences (p < 0.001) were observed in SNR (EX: 3.73 ± 0.89, IN: 3.14 ± 0.74) and fP (EX: 0.27 ± 0.09, IN: 0.25 ± 0.08). A significant (p < 0.05) higher fP (EX/IN: 0.22 ± 0.07/0.21 ± 0.07 (NS), 0.33 ± 0.07/0.30 ± 0.06 (S)) was observed in the smoker group. No significant FV differences resulted between S and NS. CONCLUSION The study proves the feasibility of free-breathing tyGASoS for multiphase lung imaging. Changes in fP may indicate an initial response in the smoker group and as such proves the sensitivity of the proposed technique. A major limitation in FV quantification rises from the large inter-subject variability of breathing patterns and amplitudes, requiring further consideration.
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Affiliation(s)
- A Balasch
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany.
| | - M S Büttner
- Department of Radiology, Ulm University Medical Centre, Ulm, Germany.
| | - P Metze
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany.
| | - K Stumpf
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany.
| | - M Beer
- Department of Radiology, Ulm University Medical Centre, Ulm, Germany.
| | - W Rottbauer
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany.
| | - V Rasche
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany.
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Bayer D, Antonucci S, Müller HP, Saad R, Dupuis L, Rasche V, Böckers TM, Ludolph AC, Kassubek J, Roselli F. Disruption of orbitofrontal-hypothalamic projections in a murine ALS model and in human patients. Transl Neurodegener 2021; 10:17. [PMID: 34059131 PMCID: PMC8168014 DOI: 10.1186/s40035-021-00241-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 05/11/2021] [Indexed: 12/12/2022] Open
Abstract
Background Increased catabolism has recently been recognized as a clinical manifestation of amyotrophic lateral sclerosis (ALS). The hypothalamic systems have been shown to be involved in the metabolic dysfunction in ALS, but the exact extent of hypothalamic circuit alterations in ALS is yet to be determined. Here we explored the integrity of large-scale cortico-hypothalamic circuits involved in energy homeostasis in murine models and in ALS patients. Methods The rAAV2-based large-scale projection mapping and image analysis pipeline based on Wholebrain and Ilastik software suites were used to identify and quantify projections from the forebrain to the lateral hypothalamus in the SOD1(G93A) ALS mouse model (hypermetabolic) and the FusΔNLS ALS mouse model (normo-metabolic). 3 T diffusion tensor imaging (DTI)-magnetic resonance imaging (MRI) was performed on 83 ALS and 65 control cases to investigate cortical projections to the lateral hypothalamus (LHA) in ALS. Results Symptomatic SOD1(G93A) mice displayed an expansion of projections from agranular insula, ventrolateral orbitofrontal and secondary motor cortex to the LHA. These findings were reproduced in an independent cohort by using a different analytic approach. In contrast, in the FusΔNLS ALS mouse model hypothalamic inputs from insula and orbitofrontal cortex were maintained while the projections from motor cortex were lost. The DTI-MRI data confirmed the disruption of the orbitofrontal-hypothalamic tract in ALS patients. Conclusion This study provides converging murine and human data demonstrating the selective structural disruption of hypothalamic inputs in ALS as a promising factor contributing to the origin of the hypermetabolic phenotype. Supplementary Information The online version contains supplementary material available at 10.1186/s40035-021-00241-6.
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Affiliation(s)
- David Bayer
- Department of Neurology, Ulm University, Ulm, Germany.,CEMMA (Cellular and Molecular Mechanisms in Aging) Research Training Group, Ulm, Germany
| | | | | | - Rami Saad
- Department of Neurology, Ulm University, Ulm, Germany
| | - Luc Dupuis
- University of Strasbourg, Strasbourg, France
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Centre, Ulm, Germany
| | - Tobias M Böckers
- Institute of Anatomy and Cell Biology, Ulm University, Ulm, Germany.,German Center for Neurodegenerative Diseases-DZNE, Ulm, Germany
| | - Albert C Ludolph
- Department of Neurology, Ulm University, Ulm, Germany.,German Center for Neurodegenerative Diseases-DZNE, Ulm, Germany
| | - Jan Kassubek
- Department of Neurology, Ulm University, Ulm, Germany.,German Center for Neurodegenerative Diseases-DZNE, Ulm, Germany
| | - Francesco Roselli
- Department of Neurology, Ulm University, Ulm, Germany. .,German Center for Neurodegenerative Diseases-DZNE, Ulm, Germany.
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Scekic-Zahirovic J, Sanjuan-Ruiz I, Kan V, Megat S, De Rossi P, Dieterlé S, Cassel R, Jamet M, Kessler P, Wiesner D, Tzeplaeff L, Demais V, Sahadevan S, Hembach KM, Muller HP, Picchiarelli G, Mishra N, Antonucci S, Dirrig-Grosch S, Kassubek J, Rasche V, Ludolph A, Boutillier AL, Roselli F, Polymenidou M, Lagier-Tourenne C, Liebscher S, Dupuis L. Cytoplasmic FUS triggers early behavioral alterations linked to cortical neuronal hyperactivity and inhibitory synaptic defects. Nat Commun 2021; 12:3028. [PMID: 34021132 PMCID: PMC8140148 DOI: 10.1038/s41467-021-23187-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 04/13/2021] [Indexed: 12/11/2022] Open
Abstract
Gene mutations causing cytoplasmic mislocalization of the RNA-binding protein FUS lead to severe forms of amyotrophic lateral sclerosis (ALS). Cytoplasmic accumulation of FUS is also observed in other diseases, with unknown consequences. Here, we show that cytoplasmic mislocalization of FUS drives behavioral abnormalities in knock-in mice, including locomotor hyperactivity and alterations in social interactions, in the absence of widespread neuronal loss. Mechanistically, we identified a progressive increase in neuronal activity in the frontal cortex of Fus knock-in mice in vivo, associated with altered synaptic gene expression. Synaptic ultrastructural and morphological defects were more pronounced in inhibitory than excitatory synapses and associated with increased synaptosomal levels of FUS and its RNA targets. Thus, cytoplasmic FUS triggers synaptic deficits, which is leading to increased neuronal activity in frontal cortex and causing related behavioral phenotypes. These results indicate that FUS mislocalization may trigger deleterious phenotypes beyond motor neuron impairment in ALS, likely relevant also for other neurodegenerative diseases characterized by FUS mislocalization.
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Affiliation(s)
- Jelena Scekic-Zahirovic
- Université de Strasbourg, Inserm, Mécanismes centraux et périphériques de la neurodégénérescence, Strasbourg, France
| | - Inmaculada Sanjuan-Ruiz
- Université de Strasbourg, Inserm, Mécanismes centraux et périphériques de la neurodégénérescence, Strasbourg, France
| | - Vanessa Kan
- Institute of Clinical Neuroimmunology, Klinikum der Universität München, Ludwig-Maximilians-University Munich, Munich, Germany
- BioMedical Center, Medical Faculty, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Salim Megat
- Université de Strasbourg, Inserm, Mécanismes centraux et périphériques de la neurodégénérescence, Strasbourg, France
| | - Pierre De Rossi
- Department of Quantitative Biomedicine, University of Zurich, Zürich, Switzerland
| | - Stéphane Dieterlé
- Université de Strasbourg, Inserm, Mécanismes centraux et périphériques de la neurodégénérescence, Strasbourg, France
| | - Raphaelle Cassel
- Université de Strasbourg, Inserm, Mécanismes centraux et périphériques de la neurodégénérescence, Strasbourg, France
- Université de Strasbourg, UMR 7364 CNRS, Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA), Strasbourg, France
| | - Marguerite Jamet
- Université de Strasbourg, Inserm, Mécanismes centraux et périphériques de la neurodégénérescence, Strasbourg, France
| | - Pascal Kessler
- Université de Strasbourg, Inserm, Unité mixte de service du CRBS, UMS 038, Strasbourg, France
| | - Diana Wiesner
- Department of Neurology, Ulm University, Ulm, Germany
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Ulm, Germany
| | - Laura Tzeplaeff
- Université de Strasbourg, UMR 7364 CNRS, Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA), Strasbourg, France
| | - Valérie Demais
- Plateforme Imagerie In Vitro, CNRS UPS-3156, NeuroPôle, Strasbourg, France
| | - Sonu Sahadevan
- Department of Quantitative Biomedicine, University of Zurich, Zürich, Switzerland
| | - Katharina M Hembach
- Department of Quantitative Biomedicine, University of Zurich, Zürich, Switzerland
| | | | - Gina Picchiarelli
- Université de Strasbourg, Inserm, Mécanismes centraux et périphériques de la neurodégénérescence, Strasbourg, France
| | - Nibha Mishra
- Department of Neurology, The Sean M. Healey and AMG Center for ALS at Mass General, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Broad Institute of Harvard University and MIT, Cambridge, MA, USA
| | - Stefano Antonucci
- Department of Neurology, Ulm University, Ulm, Germany
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Ulm, Germany
| | - Sylvie Dirrig-Grosch
- Université de Strasbourg, Inserm, Mécanismes centraux et périphériques de la neurodégénérescence, Strasbourg, France
| | - Jan Kassubek
- Department of Neurology, Ulm University, Ulm, Germany
| | - Volker Rasche
- Ulm University Medical Center, Department of Internal Medicine II, Ulm, Germany
| | - Albert Ludolph
- Department of Neurology, Ulm University, Ulm, Germany
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Ulm, Germany
| | - Anne-Laurence Boutillier
- Université de Strasbourg, UMR 7364 CNRS, Laboratoire de Neurosciences Cognitives et Adaptatives (LNCA), Strasbourg, France
| | - Francesco Roselli
- Department of Neurology, Ulm University, Ulm, Germany
- Deutsches Zentrum für Neurodegenerative Erkrankungen (DZNE), Ulm, Germany
| | | | - Clotilde Lagier-Tourenne
- Department of Neurology, The Sean M. Healey and AMG Center for ALS at Mass General, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
- Broad Institute of Harvard University and MIT, Cambridge, MA, USA
| | - Sabine Liebscher
- Institute of Clinical Neuroimmunology, Klinikum der Universität München, Ludwig-Maximilians-University Munich, Munich, Germany.
- BioMedical Center, Medical Faculty, Ludwig-Maximilians-University Munich, Munich, Germany.
- Munich Cluster for Systems Neurology (SyNergy), Munich, Germany.
| | - Luc Dupuis
- Université de Strasbourg, Inserm, Mécanismes centraux et périphériques de la neurodégénérescence, Strasbourg, France.
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Qu YY, Paul J, Li H, Ma GS, Buckert D, Rasche V. Left ventricular myocardial strain quantification with two- and three-dimensional cardiovascular magnetic resonance based tissue tracking. Quant Imaging Med Surg 2021; 11:1421-1436. [PMID: 33816179 DOI: 10.21037/qims-20-635] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Background Cardiovascular magnetic resonance based tissue tracking (CMR-TT) was reported to provide detailed insight into left ventricular (LV) contractile function and deformation with both of two- and three-dimensional (2/3D) algorithms. This study was designed to investigate the feasibility and reproducibility of these two techniques for measuring LV global and segmental strain, and establish gender- and age-related reference values of global multi-dimensional peak strains among large healthy population. Methods We retrospectively recruited 150 healthy volunteers (75 males/females) and divided them into three age groups (G20-40, G41-60 and G61-80). LV global mean and peak strains as well as segmental strains in radial, circumferential and longitudinal directions were derived from post-hoc 2/3D CMR-TT analysis of standard steady-state free precession (SSFP) cine images acquired at 1.5T field strength. Results Both 2D and 3D CMR-TT modalities enable the tracking of LV myocardial tissues and generate global and segmental strain data. By comparison, 3D CMR-TT was more feasible in measuring segmental deformation since it could generate values at all segments. The amplitudes of LV 3D global peak strain were the smallest among those of 2/3D corresponding global mean or peak strains except in the radial direction, and was highly correlated with 2D global mean strains (correlation coefficient r=0.71-0.90), 2D global peak strains (r=0.75-0.89) and 3D global mean strains (all r=0.99). In healthy cohort, LV 3D global peak values were 44.4%±13.0% for radial, -17.0%±2.7% for circumferential and -15.4%±2.3% for longitudinal strain. Females showed significantly larger amplitude of strains than males, especially in G61-80 (P<0.05). The subjects in G61-80 showed larger amplitude of strains than the volunteers in younger groups. The intra- and inter-observer agreement of 2/3D CMR-TT analysis in evaluating LV myocardial global deformation was better than segmental measurement. Conclusions CMR-TT is a feasible and reproducible technique for assessing LV myocardial deformation, especially at the global level. The establishment of specific reference values of LV global and segmental systolic strains and the investigation of dimension-, gender- and age-related differences provide a fundamental insight into the features of LV contraction and works as an essential step in clinical routine.
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Affiliation(s)
- Yang-Yang Qu
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany.,Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Jan Paul
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Hao Li
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Gen-Shan Ma
- Department of Cardiology, Zhongda Hospital, School of Medicine, Southeast University, Nanjing, China
| | - Dominik Buckert
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Volker Rasche
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany
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Arnold F, Gout J, Wiese H, Weissinger SE, Roger E, Perkhofer L, Walter K, Scheible J, Prelli Bozzo C, Lechel A, Ettrich TJ, Azoitei N, Hao L, Fürstberger A, Kaminska EK, Sparrer KMJ, Rasche V, Wiese S, Kestler HA, Möller P, Seufferlein T, Frappart PO, Kleger A. RINT1 Regulates SUMOylation and the DNA Damage Response to Preserve Cellular Homeostasis in Pancreatic Cancer. Cancer Res 2021; 81:1758-1774. [PMID: 33531371 DOI: 10.1158/0008-5472.can-20-2633] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 12/14/2020] [Accepted: 01/28/2021] [Indexed: 11/16/2022]
Abstract
Pancreatic ductal adenocarcinoma (PDAC) still presents with a dismal prognosis despite intense research. Better understanding of cellular homeostasis could identify druggable targets to improve therapy. Here we propose RAD50-interacting protein 1 (RINT1) as an essential mediator of cellular homeostasis in PDAC. In a cohort of resected PDAC, low RINT1 protein expression correlated significantly with better survival. Accordingly, RINT1 depletion caused severe growth defects in vitro associated with accumulation of DNA double-strand breaks (DSB), G2 cell cycle arrest, disruption of Golgi-endoplasmic reticulum homeostasis, and cell death. Time-resolved transcriptomics corroborated by quantitative proteome and interactome analyses pointed toward defective SUMOylation after RINT1 loss, impairing nucleocytoplasmic transport and DSB response. Subcutaneous xenografts confirmed tumor response by RINT1 depletion, also resulting in a survival benefit when transferred to an orthotopic model. Primary human PDAC organoids licensed RINT1 relevance for cell viability. Taken together, our data indicate that RINT1 loss affects PDAC cell fate by disturbing SUMOylation pathways. Therefore, a RINT1 interference strategy may represent a new putative therapeutic approach. SIGNIFICANCE: These findings provide new insights into the aggressive behavior of PDAC, showing that RINT1 directly correlates with survival in patients with PDAC by disturbing the SUMOylation process, a crucial modification in carcinogenesis.
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Affiliation(s)
- Frank Arnold
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany
| | - Johann Gout
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany
| | - Heike Wiese
- Core Unit Mass Spectrometry and Proteomics, Medical Faculty, Ulm University, Ulm, Germany
| | | | - Elodie Roger
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany
| | - Lukas Perkhofer
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany
| | - Karolin Walter
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany
| | - Jeanette Scheible
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany
| | | | - André Lechel
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany
| | - Thomas J Ettrich
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany
| | - Ninel Azoitei
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany
| | - Li Hao
- Center for Translational Imaging (MoMAN), Ulm University, Ulm, Germany
| | - Axel Fürstberger
- Institute of Medical Systems Biology, Ulm University, Ulm, Germany
| | - Ewa K Kaminska
- Clinical Cooperation Unit Neuropathology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | | | - Volker Rasche
- Center for Translational Imaging (MoMAN), Ulm University, Ulm, Germany
| | - Sebastian Wiese
- Core Unit Mass Spectrometry and Proteomics, Medical Faculty, Ulm University, Ulm, Germany
| | - Hans A Kestler
- Institute of Medical Systems Biology, Ulm University, Ulm, Germany
| | - Peter Möller
- Institute of Pathology, University Medical Centre Ulm, Ulm, Germany
| | - Thomas Seufferlein
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany
| | | | - Alexander Kleger
- Department of Internal Medicine I, University Medical Centre Ulm, Ulm, Germany.
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Li H, Qu Y, Metze P, Sommerfeld F, Just S, Abaei A, Rasche V. Quantification of Biventricular Myocardial Strain Using CMR Feature Tracking: Reproducibility in Small Animals. Biomed Res Int 2021; 2021:8492705. [PMID: 33553431 PMCID: PMC7847329 DOI: 10.1155/2021/8492705] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 12/16/2020] [Accepted: 01/13/2021] [Indexed: 12/16/2022]
Abstract
Myocardial strain is a well-validated parameter for evaluating myocardial contraction. Cardiovascular magnetic resonance myocardial feature tracking (CMR-FT) is a novel method for the quantitative measurements of myocardial strain from routine cine acquisitions. In this study, we investigated the influence of temporal resolution on tracking accuracy of CMR-FT and the intraobserver, interobserver, and interstudy reproducibilities for biventricular strain analysis in mice from self-gated CMR at 11.7 T. 12 constitutive nexilin knockout (Nexn-KO) mice, heterozygous (Het, N = 6) and wild-type (WT, N = 6), were measured with a well-established self-gating sequence twice within two weeks. CMR-FT measures of biventricular global and segmental strain parameters were derived. Interstudy, intraobserver, and interobserver reproducibilities were investigated. For the assessment of the impact of the temporal resolution for the outcome in CMR-FT, highly oversampled semi-4 chamber and midventricular short-axis data were acquired and reconstructed with 10 to 80 phases per cardiac cycle. A generally reduced biventricular myocardial strain was observed in Nexn-KO Het mice. Excellent intraobserver and interobserver reproducibility was achieved in all global strains (ICC range from 0.76 to 0.99), where global right ventricle circumferential strain (RCSSAX) showed an only good interobserver reproducibility (ICC 0.65, 0.11-0.89). For interstudy reproducibility, left ventricle longitudinal strain (LLSLAX) was the most reproducible measure of strain (ICC 0.90, 0.71-0.97). The left ventricle radial strain (LRSSAX) (ICC 0.50, 0.10-0.83) showed fair reproducibility and RCSSAX (ICC 0.36, 0.14-0.74) showed only poor reproducibility. In general, compared with global strains, the segmental strains showed relatively lower reproducibility. A minimal temporal resolution of 20 phases per cardiac cycle appeared sufficient for CMR-FT strain analysis. The analysis of myocardial strain from high-resolution self-gated cine images by CMR-FT provides a highly reproducible method for assessing myocardial contraction in small rodent animals. Especially, global LV longitudinal and circumferential strain revealed excellent reproducibility of intra- and interobserver and interstudy measurements.
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Affiliation(s)
- Hao Li
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
| | - Yangyang Qu
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Patrick Metze
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | | | - Steffen Just
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Alireza Abaei
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
| | - Volker Rasche
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
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Begus-Nahrmann Y, Hartmann D, Kraus J, Eshraghi P, Scheffold A, Grieb M, Rasche V, Schirmacher P, Lee HW, Kestler HA, Lechel A, Rudolph KL. Transient telomere dysfunction induces chromosomal instability and promotes carcinogenesis. J Clin Invest 2021; 131:145852. [PMID: 33393513 DOI: 10.1172/jci145852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Abstract
Both posture and loading rate are key factors in the herniation process and can determine the failure mechanism of the disc. The influence of disc structure on the herniation process has yet to be directly observed, thus the aim of this study was to test the hypothesis that discs containing greater levels of pre-existing disruption would be more vulnerable to herniation when subjected to severe levels of posture and loading. 30 ovine lumbar motion segments were subjected to combinations of 4 loading conditions (0 - 12° flexion,0 - 9° lateral bending, 0 - 4° axial rotation, 0-1500 N axial compression) for 1000 loading cycles at 2 Hz in a dynamic disc loading simulator. The discs were scanned in an ultra-high field MRI (magnetic resonance imaging, 11.7 T) prior to and following testing. 4 discs herniated and 7 discs suffered nucleus displacement. These discs contained pre-existing defects in the central dorsal annulus. Generally, following testing, discs contained more dorsal annulus disruption, including 7 discs which developed similar characteristic defects although these did not herniate. Overall, more severe complex postures produced more disruption. While more severe postures such as twisting and bending increased disc damage, these results are probably the first directly showing that naturally occurring defects in the disc can act as initiation sites for herniation. The clinical significance of these findings is that, in principle at least, MRI based techniques could be capable of identifying vulnerable discs, with the obvious caveat that further correlation with clinical techniques is required.
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Affiliation(s)
| | | | | | - H Wilke
- Institute of Orthopaedic Research and Biomechanics, Trauma Research Centre Ulm (ZTF), Ulm University, Ulm,
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Sagmeister F, Herrmann S, Gassenmaier T, Bernhardt P, Rasche V, Liebold A, Weidemann F, Brunner H, Beer M. Non-invasive determination of pressure recovery by cardiac MRI and echocardiography in patients with severe aortic stenosis: short and long-term outcome prediction. J Int Med Res 2020; 48:300060520954708. [PMID: 33076730 PMCID: PMC7592334 DOI: 10.1177/0300060520954708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To assess the influence of pressure recovery (PR)-corrected haemodynamic parameters on outcome in patients with aortic stenosis. METHODS Aortic stenosis severity parameters were corrected for PR (increase in static pressure due to decreasing dynamic pressure), assessed using transthoracic echocardiography (TTE) or cardiac magnetic resonance imaging (CMR), in patients with aortic stenosis. PR, indexed PR (iPR) and energy loss index (ELI) were determined. Factors that predicted all-cause mortality, and 9-month or 10-year New York Heart Association classification ≥2 were assessed using Cox proportional hazards regression. RESULTS A total of 25 patients, aged 68 ± 10 years, were included. PR was 17 ± 6 mmHg using CMR, and CMR correlated with TTE measurements. PR correction using CMR data reduced the AS-severity classification in 12-20% of patients, and correction using TTE data reduced the AS-severity classification in 16% of patients. Age (Wald 4.774) was a statistically significant predictor of all-cause mortality; effective orifice area (Wald 3.753) and ELI (Wald 3.772) almost reached significance. CONCLUSIONS PR determination may result in significant reclassification of aortic stenosis severity and may hold value in predicting all-cause mortality.
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Affiliation(s)
- Florian Sagmeister
- Department of Diagnostic and Interventional Radiology, University Hospital Ulm, Ulm, Germany.,Department of Diagnostic and Interventional Radiology, University Hospital Wuerzburg, Wuerzburg, Germany
| | - Sebastian Herrmann
- Department of Medicine I, Division of Cardiology, University Hospital Wuerzburg, Wuerzburg, Germany
| | - Tobias Gassenmaier
- Department of Diagnostic and Interventional Radiology, University Hospital Wuerzburg, Wuerzburg, Germany
| | | | - Volker Rasche
- Department of Medicine II, Cardiology, University Hospital Ulm, Ulm, Germany
| | - Andreas Liebold
- Department of Cardiac, Thoracic and Vascular Surgery, University Hospital Ulm, Ulm, Germany
| | - Frank Weidemann
- Department of Medicine I, Division of Cardiology, University Hospital Wuerzburg, Wuerzburg, Germany.,Department of Medicine I, Hospital Centre Vest, Recklinghausen, Germany
| | - Horst Brunner
- Department of Diagnostic and Interventional Radiology, University Hospital Ulm, Ulm, Germany
| | - Meinrad Beer
- Department of Diagnostic and Interventional Radiology, University Hospital Ulm, Ulm, Germany.,Department of Diagnostic and Interventional Radiology, University Hospital Wuerzburg, Wuerzburg, Germany
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Abstract
PURPOSE With the growing availability and variety of imaging modalities, new methods of intraoperative support have become available for all kinds of interventions. The basic principles of image fusion and image guidance have been widely adopted and are commercialized through a number of platforms. Although multimodal systems have been found to be useful for guiding interventional procedures, they all have their limitations. The integration of more advanced guidance techniques into the product functionality is, however, not easy due to the proprietary solutions of the vendors. Therefore, the purpose of this work is to introduce a software system for image fusion, real-time navigation, and working points documentation during transcatheter interventions performed under X-ray (XR) guidance. METHODS An interactive software system for cross-modal registration and image fusion of XR fluoroscopy with CT or MRI-derived anatomic 3D models is implemented using Qt application framework and VTK visualization pipeline. DICOM data can be imported in retrospective mode. Live XR data input is realized by a video capture card application interface. RESULTS The actual software release offers a graphical user interface with basic functionality including data import and handling, calculation of projection geometry and transformations between related coordinate systems, rigid 3D-3D registration, and template matching-based tracking and motion compensation algorithms in 2D and 3D. The link to the actual software release on GitHub including source code and executable is provided to support independent research and development in the field of intervention guidance. CONCLUSION The introduced system provides a common foundation for the rapid prototyping of new approaches in the field of XR fluoroscopic guidance. As a pure software solution, the developed system is potentially vendor-independent and can be easily extended to be used with the XR systems of different manufacturers.
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Affiliation(s)
- Ina Vernikouskaya
- Clinic of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081 Ulm, Germany
| | - Dagmar Bertsche
- Clinic of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081 Ulm, Germany
| | - Wolfgang Rottbauer
- Clinic of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081 Ulm, Germany
| | - Volker Rasche
- Clinic of Internal Medicine II, Ulm University Medical Center, Albert-Einstein-Allee 23, 89081 Ulm, Germany
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Schwer J, Rahman MM, Stumpf K, Rasche V, Ignatius A, Dürselen L, Seitz AM. Degeneration Affects Three-Dimensional Strains in Human Menisci: In situ MRI Acquisition Combined With Image Registration. Front Bioeng Biotechnol 2020; 8:582055. [PMID: 33042980 PMCID: PMC7526678 DOI: 10.3389/fbioe.2020.582055] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 08/28/2020] [Indexed: 11/20/2022] Open
Abstract
Degenerative changes of menisci contribute to the evolution of osteoarthritis in the knee joint, because they alter the load transmission to the adjacent articular cartilage. Identifying alterations in the strain response of meniscal tissue under compression that are associated with progressive degeneration may uncover links between biomechanical function and meniscal degeneration. Therefore, the goal of this study was to investigate how degeneration effects the three-dimensional (3D; axial, circumferential, radial) strain in different anatomical regions of human menisci (anterior and posterior root attachment; anterior and posterior horn; pars intermedia) under simulated compression. Magnetic resonance imaging (MRI) was performed to acquire image sequences of 12 mild and 12 severe degenerated knee joints under unloaded and loaded [25%, 50% and 100% body weight (BW)] conditions using a customized loading device. Medial and lateral menisci as well as their root attachments were manually segmented. Intensity-based rigid and non-rigid image registration were performed to obtain 3D deformation fields under the respective load levels. Finally, the 3D voxels were transformed into hexahedral finite-element models and direction-dependent local strain distributions were determined. The axial compressive strain in menisci and meniscal root attachments significantly increased on average from 3.1% in mild degenerated joints to 7.3% in severe degenerated knees at 100% BW (p ≤ 0.021). In severe degenerated knee joints, the menisci displayed a mean circumferential strain of 0.45% (mild: 0.35%) and a mean radial strain of 0.41% (mild: 0.37%) at a load level of 100% BW. No significant changes were observed in the circumferential or radial directions between mild and severe degenerated knee joints for all load levels (p > 0.05). In conclusion, high-resolution MRI was successfully combined with image registration to investigate spatial strain distributions of the meniscus and its attachments in response to compression. The results of the current study highlight that the compressive integrity of the meniscus decreases with progressing tissue degeneration, whereas the tensile properties are maintained.
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Affiliation(s)
- Jonas Schwer
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Ulm, Germany
| | - Muhammed Masudur Rahman
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Ulm, Germany.,Department of Mechanical Engineering, University of Connecticut, Storrs, CT, United States
| | - Kilian Stumpf
- Experimental Cardiovascular Imaging, Department of Internal Medicine II, University Hospital Ulm, Ulm, Germany
| | - Volker Rasche
- Experimental Cardiovascular Imaging, Department of Internal Medicine II, University Hospital Ulm, Ulm, Germany
| | - Anita Ignatius
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Ulm, Germany
| | - Lutz Dürselen
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Ulm, Germany
| | - Andreas Martin Seitz
- Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm, Ulm University Medical Centre, Ulm, Germany
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Roger E, Gout J, Arnold F, Beutel AK, Müller M, Abaei A, Barth TFE, Rasche V, Seufferlein T, Perkhofer L, Kleger A. Maintenance Therapy for ATM-Deficient Pancreatic Cancer by Multiple DNA Damage Response Interferences after Platinum-Based Chemotherapy. Cells 2020; 9:cells9092110. [PMID: 32948057 PMCID: PMC7563330 DOI: 10.3390/cells9092110] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/11/2020] [Accepted: 09/14/2020] [Indexed: 12/12/2022] Open
Abstract
Personalized medicine in treating pancreatic ductal adenocarcinoma (PDAC) is still in its infancy, albeit PDAC-related deaths are projected to rise over the next decade. Only recently, maintenance therapy with the PARP inhibitor olaparib showed improved progression-free survival in germline BRCA1/2-mutated PDAC patients after platinum-based induction for the first time. Transferability of such a concept to other DNA damage response (DDR) genes remains unclear. Here, we conducted a placebo-controlled, three-armed preclinical trial to evaluate the efficacy of multi-DDR interference (mDDRi) as maintenance therapy vs. continuous FOLFIRINOX treatment, implemented with orthotopically transplanted ATM-deficient PDAC cell lines. Kaplan–Meier analysis, cross-sectional imaging, histology, and in vitro analysis served as analytical readouts. Median overall survival was significantly longer in the mDDRi maintenance arm compared to the maintained FOLFIRINOX treatment. This survival benefit was mirrored in the highest DNA-damage load, accompanied by superior disease control and reduced metastatic burden. In vitro analysis suggests FOLFIRINOX-driven selection of invasive subclones, erased by subsequent mDDRi treatment. Collectively, this preclinical trial substantiates mDDRi in a maintenance setting as a novel therapeutic option and extends the concept to non-germline BRCA1/2-mutant PDAC.
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Affiliation(s)
- Elodie Roger
- Department of Internal Medicine 1, University Medical Center Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany; (E.R.); (J.G.); (F.A.); (A.K.B.); (T.S.)
| | - Johann Gout
- Department of Internal Medicine 1, University Medical Center Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany; (E.R.); (J.G.); (F.A.); (A.K.B.); (T.S.)
| | - Frank Arnold
- Department of Internal Medicine 1, University Medical Center Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany; (E.R.); (J.G.); (F.A.); (A.K.B.); (T.S.)
| | - Alica K. Beutel
- Department of Internal Medicine 1, University Medical Center Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany; (E.R.); (J.G.); (F.A.); (A.K.B.); (T.S.)
| | - Martin Müller
- Department of Internal Medicine 1, University Medical Center Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany; (E.R.); (J.G.); (F.A.); (A.K.B.); (T.S.)
| | - Alireza Abaei
- Center for Translational Imaging (MoMAN), Ulm University, 89081 Ulm, Germany; (A.A.); (V.R.)
| | - Thomas F. E. Barth
- Institute of Pathology, University Medical Center Ulm, 89081 Ulm, Germany;
| | - Volker Rasche
- Center for Translational Imaging (MoMAN), Ulm University, 89081 Ulm, Germany; (A.A.); (V.R.)
| | - Thomas Seufferlein
- Department of Internal Medicine 1, University Medical Center Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany; (E.R.); (J.G.); (F.A.); (A.K.B.); (T.S.)
| | - Lukas Perkhofer
- Department of Internal Medicine 1, University Medical Center Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany; (E.R.); (J.G.); (F.A.); (A.K.B.); (T.S.)
- Correspondence: (L.P.); (A.K.); Tel.: +49-731-500 44769 (L.P.); +49-731-500 44728 (A.K.)
| | - Alexander Kleger
- Department of Internal Medicine 1, University Medical Center Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany; (E.R.); (J.G.); (F.A.); (A.K.B.); (T.S.)
- Correspondence: (L.P.); (A.K.); Tel.: +49-731-500 44769 (L.P.); +49-731-500 44728 (A.K.)
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Müller HP, Roselli F, Rasche V, Kassubek J. Diffusion Tensor Imaging-Based Studies at the Group-Level Applied to Animal Models of Neurodegenerative Diseases. Front Neurosci 2020; 14:734. [PMID: 32982659 PMCID: PMC7487414 DOI: 10.3389/fnins.2020.00734] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Accepted: 06/22/2020] [Indexed: 12/11/2022] Open
Abstract
The understanding of human and non-human microstructural brain alterations in the course of neurodegenerative diseases has substantially improved by the non-invasive magnetic resonance imaging (MRI) technique of diffusion tensor imaging (DTI). Animal models (including disease or knockout models) allow for a variety of experimental manipulations, which are not applicable to humans. Thus, the DTI approach provides a promising tool for cross-species cross-sectional and longitudinal investigations of the neurobiological targets and mechanisms of neurodegeneration. This overview with a systematic review focuses on the principles of DTI analysis as used in studies at the group level in living preclinical models of neurodegeneration. The translational aspect from in-vivo animal models toward (clinical) applications in humans is covered as well as the DTI-based research of the non-human brains' microstructure, the methodological aspects in data processing and analysis, and data interpretation at different abstraction levels. The aim of integrating DTI in multiparametric or multimodal imaging protocols will allow the interrogation of DTI data in terms of directional flow of information and may identify the microstructural underpinnings of neurodegeneration-related patterns.
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Affiliation(s)
| | - Francesco Roselli
- Department of Neurology, University of Ulm, Ulm, Germany.,German Center for Neurodegenerative Diseases (DZNE), Ulm, Germany
| | - Volker Rasche
- Core Facility Small Animal MRI, University of Ulm, Ulm, Germany
| | - Jan Kassubek
- Department of Neurology, University of Ulm, Ulm, Germany
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Lanz B, Abaei A, Braissant O, Choi IY, Cudalbu C, Henry PG, Gruetter R, Kara F, Kantarci K, Lee P, Lutz NW, Marjańska M, Mlynárik V, Rasche V, Xin L, Valette J. Magnetic resonance spectroscopy in the rodent brain: Experts' consensus recommendations. NMR Biomed 2020; 34:e4325. [PMID: 33565219 PMCID: PMC9429976 DOI: 10.1002/nbm.4325] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 03/29/2020] [Accepted: 04/30/2020] [Indexed: 05/21/2023]
Abstract
In vivo MRS is a non-invasive measurement technique used not only in humans, but also in animal models using high-field magnets. MRS enables the measurement of metabolite concentrations as well as metabolic rates and their modifications in healthy animals and disease models. Such data open the way to a deeper understanding of the underlying biochemistry, related disturbances and mechanisms taking place during or prior to symptoms and tissue changes. In this work, we focus on the main preclinical 1H, 31P and 13C MRS approaches to study brain metabolism in rodent models, with the aim of providing general experts' consensus recommendations (animal models, anesthesia, data acquisition protocols). An overview of the main practical differences in preclinical compared with clinical MRS studies is presented, as well as the additional biochemical information that can be obtained in animal models in terms of metabolite concentrations and metabolic flux measurements. The properties of high-field preclinical MRS and the technical limitations are also described.
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Affiliation(s)
- Bernard Lanz
- Laboratory for Functional and Metabolic Imaging (LIFMET), Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
- Sir Peter Mansfield Imaging Centre, School of Medicine, University of Nottingham, Nottingham, United Kingdom
| | - Alireza Abaei
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
| | - Olivier Braissant
- Service of Clinical Chemistry, University of Lausanne and University Hospital of Lausanne, Lausanne, Switzerland
| | - In-Young Choi
- Department of Neurology, University of Kansas Medical Center, Kansas City, Kansas, US
| | - Cristina Cudalbu
- Centre d’Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Pierre-Gilles Henry
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, Minnesota, US
| | - Rolf Gruetter
- Laboratory for Functional and Metabolic Imaging (LIFMET), Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Firat Kara
- Department of Radiology, Mayo Clinic, Rochester, Minnesota, US
| | - Kejal Kantarci
- Department of Radiology, Mayo Clinic, Rochester, Minnesota, US
| | - Phil Lee
- Department of Radiology, University of Kansas Medical Center, Kansas City, Kansas, US
| | | | - Małgorzata Marjańska
- Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota, Minneapolis, Minnesota, US
| | - Vladimír Mlynárik
- High Field MR Centre, Department of Biomedical Imaging and Image-Guided Therapy, Medical University of Vienna, Vienna, Austria
| | - Volker Rasche
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
| | - Lijing Xin
- Centre d’Imagerie Biomedicale (CIBM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Julien Valette
- Commissariat à l’Energie Atomique et aux Energies Alternatives, MIRCen, Fontenay-aux-Roses, France
- Neurodegenerative Diseases Laboratory, Centre National de la Recherche Scientifique, Université Paris-Sud, Université Paris-Saclay, UMR 9199, Fontenay-aux-Roses, France
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Balasch A, Metze P, Stumpf K, Beer M, Büttner SM, Rottbauer W, Speidel T, Rasche V. 2D
Ultrashort Echo‐Time Functional Lung Imaging. J Magn Reson Imaging 2020; 52:1637-1644. [DOI: 10.1002/jmri.27269] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 06/10/2020] [Accepted: 06/11/2020] [Indexed: 12/11/2022] Open
Affiliation(s)
- Anke Balasch
- Department of Internal Medicine II Ulm University Medical Centre Ulm Germany
| | - Patrick Metze
- Department of Internal Medicine II Ulm University Medical Centre Ulm Germany
| | - Kilian Stumpf
- Department of Internal Medicine II Ulm University Medical Centre Ulm Germany
| | - Meinrad Beer
- Department of Radiology Ulm University Medical Centre Ulm Germany
| | | | - Wolfgang Rottbauer
- Department of Internal Medicine II Ulm University Medical Centre Ulm Germany
| | - Tobias Speidel
- Core‐Facility Small Animal Imaging, Medical Faculty Ulm University Germany
| | - Volker Rasche
- Department of Internal Medicine II Ulm University Medical Centre Ulm Germany
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Li H, Metze P, Abaei A, Rottbauer W, Just S, Lu Q, Rasche V. Feasibility of real-time cardiac MRI in mice using tiny golden angle radial sparse. NMR Biomed 2020; 33:e4300. [PMID: 32227427 DOI: 10.1002/nbm.4300] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 03/02/2020] [Accepted: 03/05/2020] [Indexed: 06/10/2023]
Abstract
Cardiovascular magnetic resonance imaging has proven valuable for the assessment of structural and functional cardiac abnormalities. Even although it is an established imaging method in small animals, the long acquisition times of gated or self-gated techniques still limit its widespread application. In this study, the application of tiny golden angle radial sparse MRI (tyGRASP) for real-time cardiac imaging was tested in 12 constitutive nexilin (Nexn) knock-out (KO) mice, both heterozygous (Het, N = 6) and wild-type (WT, N = 6), and the resulting functional parameters were compared with a well-established self-gating approach. Real-time images were reconstructed for different temporal resolutions of between 16.8 and 79.8 ms per image. The suggested approach was additionally tested for dobutamine stress and qualitative first-pass perfusion imaging. Measurements were repeated twice within 2 weeks for reproducibility assessment. In direct comparison with the high-quality, self-gated technique, the real-time approach did not show any significant differences in global function parameters for acquisition times below 50 ms (rest) and 31.5 ms (stress). Compared with WT, the end-diastolic volume (EDV) and end-systolic volume (ESV) were markedly higher (P < 0.05) and the ejection fraction (EF) was significantly lower in the Het Nexn-KO mice at rest (P < 0.001). For the stress investigation, a clear decrease of EDV and ESV, and an increase in EF, but maintained stroke volume, could be observed in both groups. Combined with ECG-triggering, tyGRASP provided first-pass perfusion data with a temporal resolution of one image per heartbeat, allowing the quantitative assessment of upslope curves in the blood-pool and myocardium. Excellent inter-study reproducibility was achieved in all the functional parameters. The tyGRASP is a valuable real-time MRI technique for mice, which significantly reduces the scan time in preclinical cardiac functional imaging, providing sufficient image quality for deriving accurate functional parameters, and has the potential to investigate real-time and beat-to-beat changes.
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Affiliation(s)
- Hao Li
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
- Department of Cardiology, The Second Hospital of Shandong University, Jinan, China
| | - Patrick Metze
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Alireza Abaei
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
| | - Wolfgang Rottbauer
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Steffen Just
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | - Qinghua Lu
- Department of Cardiology, The Second Hospital of Shandong University, Jinan, China
| | - Volker Rasche
- Core Facility Small Animal Imaging, Ulm University, Ulm, Germany
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany
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Qu YY, Li H, Rottbauer W, Ma GS, Buckert D, Rasche V. Right ventricular free wall longitudinal strain and strain rate quantification with cardiovascular magnetic resonance based tissue tracking. Int J Cardiovasc Imaging 2020; 36:1985-1996. [PMID: 32462446 PMCID: PMC7497525 DOI: 10.1007/s10554-020-01895-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 05/21/2020] [Indexed: 12/24/2022]
Abstract
Cardiovascular magnetic resonance based tissue tracking (CMR-TT) was reported to provide detailed insight into left ventricular mechanical features. However, inadequate knowledge of the right ventricle (RV) mechanical deformation has been acquired by this advanced technique so far. It was the aim of this study to establish reference values of RV free wall (RVFW) global, regional and segmental longitudinal peak strain and strain rate (LS and LSR), and to investigate the gender- and age-related difference as well as the base-to-apex gradient of RVFW-LS and LSR with CMR-TT. 150 healthy volunteers (75 males/females) were retrospectively and continuously recruited and subdivided into three age groups (G20–40, G41–60 and G61–80). RVFW global, regional (basal, middle-cavity and apical) and segmental LS (GLS, RLS, SLS) along with systolic and diastolic LSR were generated by post-hoc CMR-TT analysis of standard steady-state free precession long-axis four-chamber view cine images acquired at 1.5T field strength. The reference value of myocardial RVFW-GLS was − 24.9 ± 5.2%. We found that females showed more negative GLS than males except in the youngest group, and no age-related difference of GLS was observed in both gender groups. RLS and SLS presented with the same age-related tendency as GLS. The basal and middle-cavity LS were similar between each other and significantly larger than apical LS. RVFW-GLSR resulted as − 1.73 ± 0.58 s−1 and 1.69 ± 0.65 s−1 during systolic and diastolic phases, respectively. The diastolic GLSR of males tended to decline with the ageing and was significantly lower than that of females in G61–80 group. Regional and segmental LSR showed significant gender-related differences in certain basal and apical region/segments without any age-related effects. CMR-TT overcomes the difficulty in measuring RV global and segmental deformation. The establishment of the vendor-, gender- and segment-specific reference values of RVFW-LS and LSR is essential for the rapid and efficient utilization of CMR-TT modality in the clinical routine.
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Affiliation(s)
- Yang-Yang Qu
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany.,Medical School of Southeast University, Nanjing, China
| | - Hao Li
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany
| | | | - Gen-Shan Ma
- Medical School of Southeast University, Nanjing, China.,Department of Cardiology, Zhongda Hospital, Southeast University, Nanjing, China
| | - Dominik Buckert
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Volker Rasche
- Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
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Winter G, Koch ABF, Löffler J, Lindén M, Solbach C, Abaei A, Li H, Glatting G, Beer AJ, Rasche V. Multi-Modal PET and MR Imaging in the Hen's Egg Test-Chorioallantoic Membrane (HET-CAM) Model for Initial in Vivo Testing of Target-Specific Radioligands. Cancers (Basel) 2020; 12:cancers12051248. [PMID: 32429233 PMCID: PMC7281765 DOI: 10.3390/cancers12051248] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/11/2020] [Accepted: 05/12/2020] [Indexed: 12/17/2022] Open
Abstract
The validation of novel target-specific radioligands requires animal experiments mostly using mice with xenografts. A pre-selection based on a simpler in vivo model would allow to reduce the number of animal experiments, in accordance with the 3Rs principles (reduction, replacement, refinement). In this respect, the chick embryo or hen’s egg test–chorioallantoic membrane (HET-CAM) model is of special interest, as it is not considered an animal until day 17. Thus, we evaluated the feasibility of quantitative analysis of target-specific radiotracer accumulation in xenografts using the HET-CAM model and combined positron emission tomography (PET) and magnetic resonance imaging (MRI). For proof-of-principle we used established prostate-specific membrane antigen (PSMA)-positive and PSMA-negative prostate cancer xenografts and the clinically widely used PSMA-specific PET-tracer [68Ga]Ga-PSMA-11. Tracer accumulation was quantified by PET and tumor volumes measured with MRI (n = 42). Moreover, gamma-counter analysis of radiotracer accumulation was done ex-vivo. A three- to five-fold higher ligand accumulation in the PSMA-positive tumors compared to the PSMA-negative tumors was demonstrated. This proof-of-principle study shows the general feasibility of the HET-CAM xenograft model for target-specific imaging with PET and MRI. The ultimate value for characterization of novel target-specific radioligands now has to be validated in comparison to mouse xenograft experiments.
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Affiliation(s)
- Gordon Winter
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany; (A.B.F.K.); (J.L.); (C.S.); (A.J.B.)
- Correspondence: (G.W.); (V.R.); Tel.: +49-731-500-61364 (G.W.); +49-731-500-45014 (V.R.)
| | - Andrea B. F. Koch
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany; (A.B.F.K.); (J.L.); (C.S.); (A.J.B.)
| | - Jessica Löffler
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany; (A.B.F.K.); (J.L.); (C.S.); (A.J.B.)
- Core Facility Small Animal Imaging, Ulm University Medical Center, 89081 Ulm, Germany; (A.A.); (H.L.)
| | - Mika Lindén
- Department of Inorganic Chemistry II, Ulm University, 89081 Ulm, Germany;
| | - Christoph Solbach
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany; (A.B.F.K.); (J.L.); (C.S.); (A.J.B.)
| | - Alireza Abaei
- Core Facility Small Animal Imaging, Ulm University Medical Center, 89081 Ulm, Germany; (A.A.); (H.L.)
| | - Hao Li
- Core Facility Small Animal Imaging, Ulm University Medical Center, 89081 Ulm, Germany; (A.A.); (H.L.)
| | - Gerhard Glatting
- Department of Nuclear Medicine, Medical Radiation Physics, Ulm University Medical Center, 89081 Ulm, Germany;
| | - Ambros J. Beer
- Department of Nuclear Medicine, Ulm University Medical Center, 89081 Ulm, Germany; (A.B.F.K.); (J.L.); (C.S.); (A.J.B.)
| | - Volker Rasche
- Core Facility Small Animal Imaging, Ulm University Medical Center, 89081 Ulm, Germany; (A.A.); (H.L.)
- Internal Medicine II, Ulm University Medical Center, 89081 Ulm, Germany
- Correspondence: (G.W.); (V.R.); Tel.: +49-731-500-61364 (G.W.); +49-731-500-45014 (V.R.)
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Stumpf K, Kaye E, Paul J, Wundrak S, Pauly JM, Rasche V. Two‐dimensional UTE overview imaging for dental application. Magn Reson Med 2020; 84:2616-2624. [DOI: 10.1002/mrm.28312] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 04/10/2020] [Accepted: 04/16/2020] [Indexed: 12/22/2022]
Affiliation(s)
- Kilian Stumpf
- Department of Internal Medicine II Ulm University Medical Center Ulm Germany
| | - Elena Kaye
- Department of Medical Physics Memorial Sloan Kettering Cancer Center New York New York USA
| | - Jan Paul
- Department of Internal Medicine II Ulm University Medical Center Ulm Germany
- Dental Imaging Dentsply Sirona Bensheim Germany
| | - Stefan Wundrak
- Department of Internal Medicine II Ulm University Medical Center Ulm Germany
- Dental Imaging Dentsply Sirona Bensheim Germany
| | - John M. Pauly
- Department of Electrical Engineering Stanford University Stanford California USA
| | - Volker Rasche
- Department of Internal Medicine II Ulm University Medical Center Ulm Germany
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Yilmazer-Hanke D, Mayer T, Müller HP, Neugebauer H, Abaei A, Scheuerle A, Weis J, Forsberg KME, Althaus K, Meier J, Ludolph AC, Del Tredici K, Braak H, Kassubek J, Rasche V. Histological correlates of postmortem ultra-high-resolution single-section MRI in cortical cerebral microinfarcts. Acta Neuropathol Commun 2020; 8:33. [PMID: 32169123 PMCID: PMC7071593 DOI: 10.1186/s40478-020-00900-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 02/21/2020] [Indexed: 02/07/2023] Open
Abstract
The identification of cerebral microinfarctions with magnetic resonance imaging (MRI) and histological methods remains challenging in aging and dementia. Here, we matched pathological changes in the microvasculature of cortical cerebral microinfarcts to MRI signals using single 100 μm-thick histological sections scanned with ultra-high-resolution 11.7 T MRI. Histologically, microinfarcts were located in superficial or deep cortical layers or transcortically, compatible with the pattern of layer-specific arteriolar blood supply of the cerebral cortex. Contrary to acute microinfarcts, at chronic stages the core region of microinfarcts showed pallor with extracellular accumulation of lipofuscin and depletion of neurons, a dense meshwork of collagen 4-positive microvessels with numerous string vessels, CD68-positive macrophages and glial fibrillary acidic protein (GFAP)-positive astrocytes. In MRI scans, cortical microinfarcts at chronic stages, called chronic cortical microinfarcts here, gave hypointense signals in T1-weighted and hyperintense signals in T2-weighted images when thinning of the tissue and cavitation and/or prominent iron accumulation were present. Iron accumulation in chronic microinfarcts, histologically verified with Prussian blue staining, also produced strong hypointense T2*-weighted signals. In summary, the microinfarct core was occupied by a dense microvascular meshwork with string vessels, which was invaded by macrophages and astroglia and contained various degrees of iron accumulation. While postmortem ultra-high-resolution single-section imaging improved MRI-histological matching and the structural characterization of chronic cortical cerebral microinfarcts, miniscule microinfarcts without thinning or iron accumulation could not be detected with certainty in the MRI scans. Moreover, string vessels at the infarct margin indicate disturbances in the microcirculation in and around microinfarcts, which might be exploitable in the diagnostics of cortical cerebral microinfarcts with MRI in vivo.
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Metze P, Li H, Speidel T, Buckert D, Rottbauer W, Rasche V. Sliding window reduced FOV reconstruction for real-time cardiac imaging. Z Med Phys 2020; 30:236-244. [PMID: 32067862 DOI: 10.1016/j.zemedi.2020.01.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 12/11/2019] [Accepted: 01/07/2020] [Indexed: 11/29/2022]
Abstract
BACKGROUND Current functional cardiovascular imaging protocols mostly rely on electrocardiogram (ECG) gating and breathholding. The resulting image quality can substantially suffer from insufficient patient cooperation or severe arrhythmia. Real-time imaging can mitigate these effects but requires highly accelerated techniques, usually relying on non-cartesian trajectories and Compressed Sensing (CS). METHODS We investigate a sliding window reduced field of view (FOV) Echo Planar Imaging (EPI) technique for real-time cardiac MRI. Segmented EPI has been combined with a subtraction technique for reducing the FOV in cardiac applications to the region of the beating heart. Residual respiratory motion, potentially impairing the image quality, has been addressed by continuous update of the static image fraction, which is derived from a low-temporal resolution sliding window reconstruction. For further acceleration, the proposed technique was combined with parallel imaging. RESULTS The sliding window reduced FOV technique was proven feasible to reconstruct images of diagnostic image quality at a temporal resolution of 36.5ms per image. Semi-quantitative evaluation of image quality showed significant improvement over the existing rFOV method (p=0.039). Derived functional parameters show comparable results as with the BH-CINE reference. However, a trend to a slight underestimation of the largest and smallest in-plane volumes is observed. CONCLUSION The proposed technique is feasible of providing real-time cardiac MRI with a temporal resolution better than 40ms without the need of computably complex reconstruction techniques.
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Affiliation(s)
- Patrick Metze
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Hao Li
- Core Facility Small Animal Imaging (CF-SANI), Ulm University, Ulm, Germany.
| | - Tobias Speidel
- Core Facility Small Animal Imaging (CF-SANI), Ulm University, Ulm, Germany.
| | - Dominik Buckert
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Wolfgang Rottbauer
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany.
| | - Volker Rasche
- Department of Internal Medicine II, Ulm University Medical Center, Ulm, Germany; Core Facility Small Animal Imaging (CF-SANI), Ulm University, Ulm, Germany.
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