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Qiu X, Liu Y, Lv F. Application Value of a Novel Micro-Coil in High-Resolution Imaging of Experimental Mice Based on 3.0 T Clinical MR. Tomography 2024; 10:839-847. [PMID: 38921941 PMCID: PMC11209402 DOI: 10.3390/tomography10060064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2024] [Revised: 05/27/2024] [Accepted: 05/27/2024] [Indexed: 06/27/2024] Open
Abstract
The clinical magnetic resonance scanner (field strength ≤ 3.0 T) has limited efficacy in the high-resolution imaging of experimental mice. This study introduces a novel magnetic resonance micro-coil designed to enhance the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR), thereby improving high-resolution imaging in experimental mice using clinical magnetic resonance scanners. Initially, a phantom was utilized to determine the maximum spatial resolution achievable by the novel micro-coil. Subsequently, 12 C57BL/6JGpt mice were included in this study, and the novel micro-coil was employed for their scanning. A clinical flexible coil was selected for comparative analysis. The scanning methodologies for both coils were consistent. The imaging clarity, noise, and artifacts produced by the two coils on mouse tissues and organs were subjectively evaluated, while the SNR and CNR of the brain, spinal cord, and liver were objectively measured. Differences in the images produced by the two coils were compared. The results indicated that the maximum spatial resolution of the novel micro-coil was 0.2 mm. Furthermore, the subjective evaluation of the images obtained using the novel micro-coil was superior to that of the flexible coil (p < 0.05). The SNR and CNR measurements for the brain, spinal cord, and liver using the novel micro-coil were significantly higher than those obtained with the flexible coil (p < 0.001). Our study suggests that the novel micro-coil is highly effective in enhancing the image quality of clinical magnetic resonance scanners in experimental mice.
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Affiliation(s)
- Xueke Qiu
- State Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing 400016, China; (X.Q.); (Y.L.)
| | - Yang Liu
- State Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing 400016, China; (X.Q.); (Y.L.)
| | - Fajin Lv
- State Key Laboratory of Ultrasound in Medicine and Engineering, College of Biomedical Engineering, Chongqing Medical University, Chongqing 400016, China; (X.Q.); (Y.L.)
- Department of Radiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, China
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Alpers J, Hensen B, Rötzer M, Reimert DL, Gerlach T, Vick R, Gutberlet M, Wacker F, Hansen C. Comparison study of reconstruction algorithms for volumetric necrosis maps from 2D multi-slice GRE thermometry images. Sci Rep 2022; 12:11509. [PMID: 35799055 PMCID: PMC9263155 DOI: 10.1038/s41598-022-15712-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 06/28/2022] [Indexed: 12/24/2022] Open
Abstract
Cancer is a disease which requires a significant amount of careful medical attention. For minimally-invasive thermal ablation procedures, the monitoring of heat distribution is one of the biggest challenges. In this work, three approaches for volumetric heat map reconstruction (Delauney triangulation, minimum volume enclosing ellipsoids (MVEE) and splines) are presented based on uniformly distributed 2D MRI phase images rotated around the applicator’s main axis. We compare them with our previous temperature interpolation method with respect to accuracy, robustness and adaptability. All approaches are evaluated during MWA treatment on the same data sets consisting of 13 ex vivo bio protein phantoms, including six phantoms with simulated heat sink effects. Regarding accuracy, the DSC similarity results show a strong trend towards the MVEE (\documentclass[12pt]{minimal}
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\begin{document}$$0.80\pm 0.03$$\end{document}0.80±0.03) and the splines (\documentclass[12pt]{minimal}
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\begin{document}$$0.77\pm 0.04$$\end{document}0.77±0.04) method compared to the Delauney triangulation (\documentclass[12pt]{minimal}
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\begin{document}$$0.75\pm 0.02$$\end{document}0.75±0.02) or the temperature interpolation (\documentclass[12pt]{minimal}
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\begin{document}$$0.73\pm 0.07$$\end{document}0.73±0.07). Robustness is increased for all three approaches and the adaptability shows a significant trend towards the initial interpolation method and the splines. To overcome local inhomogeneities in the acquired data, the use of adaptive simulations should be considered in the future. In addition, the transfer to in vivo animal experiments should be considered to test for clinical applicability.
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Affiliation(s)
- Julian Alpers
- Faculty of Computer Science, Otto-von-Guericke University, 39106, Magdeburg, Germany. .,Research Campus STIMULATE, Otto-von-Guericke University, 39106, Magdeburg, Germany.
| | - Bennet Hensen
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, 30625, Hannover, Germany.,Research Campus STIMULATE, Otto-von-Guericke University, 39106, Magdeburg, Germany
| | - Maximilian Rötzer
- Faculty of Computer Science, Otto-von-Guericke University, 39106, Magdeburg, Germany.,Research Campus STIMULATE, Otto-von-Guericke University, 39106, Magdeburg, Germany
| | - Daniel L Reimert
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, 30625, Hannover, Germany.,Research Campus STIMULATE, Otto-von-Guericke University, 39106, Magdeburg, Germany
| | - Thomas Gerlach
- Faculty of Electrical Engineering and Information Technologies, Otto-von-Guericke University, 39106, Magdeburg, Germany.,Research Campus STIMULATE, Otto-von-Guericke University, 39106, Magdeburg, Germany
| | - Ralf Vick
- Faculty of Electrical Engineering and Information Technologies, Otto-von-Guericke University, 39106, Magdeburg, Germany.,Research Campus STIMULATE, Otto-von-Guericke University, 39106, Magdeburg, Germany
| | - Marcel Gutberlet
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, 30625, Hannover, Germany.,Research Campus STIMULATE, Otto-von-Guericke University, 39106, Magdeburg, Germany
| | - Frank Wacker
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, 30625, Hannover, Germany.,Research Campus STIMULATE, Otto-von-Guericke University, 39106, Magdeburg, Germany
| | - Christian Hansen
- Faculty of Computer Science, Otto-von-Guericke University, 39106, Magdeburg, Germany.,Research Campus STIMULATE, Otto-von-Guericke University, 39106, Magdeburg, Germany
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Lutz NW, Bernard M. Contactless Thermometry by MRI and MRS: Advanced Methods for Thermotherapy and Biomaterials. iScience 2020; 23:101561. [PMID: 32954229 PMCID: PMC7489251 DOI: 10.1016/j.isci.2020.101561] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Control of temperature variation is of primordial importance in particular areas of biomedicine. In this context, medical treatments such as hyperthermia and cryotherapy, and also the development and use of hydrogel-based biomaterials, are of particular concern. To enable accurate temperature measurement without perturbing or even destroying the biological tissue or material to be monitored, contactless thermometry methods are preferred. Among these, the most suitable are based on magnetic resonance imaging and spectroscopy (MRI, MRS). Here, we address the latest developments in this field as well as their current and anticipated practical applications. We highlight recent progress aimed at rendering MR thermometry faster and more reproducible, versatile, and sophisticated and provide our perspective on how these new techniques broaden the range of applications in medical treatments and biomaterial development by enabling insight into finer details of thermal behavior. Thus, these methods facilitate optimization of clinical and industrial heating and cooling protocols.
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Affiliation(s)
- Norbert W. Lutz
- Aix-Marseille University, CNRS, CRMBM, 27 Bd Jean Moulin, 13005 Marseille, France
| | - Monique Bernard
- Aix-Marseille University, CNRS, CRMBM, 27 Bd Jean Moulin, 13005 Marseille, France
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Jiang R, Jia S, Qiao Y, Chen Q, Wen J, Liang D, Liu X, Zheng H, Zou C. Real-time volumetric MR thermometry using 3D echo-shifted sequence under an open source reconstruction platform. Magn Reson Imaging 2020; 70:22-28. [DOI: 10.1016/j.mri.2020.04.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 04/02/2020] [Accepted: 04/03/2020] [Indexed: 12/20/2022]
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