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Guo Y, Wang W, Li W, Li J, Zhu M, Song R, Zhu W, Wang L, Ji Z, Shi X. In vivo electrical properties of the healthy liver and the hepatic tumor in a mouse model between 1 Hz and 1 MHz during a thermal treatment. Int J Hyperthermia 2024; 41:2396122. [PMID: 39218439 DOI: 10.1080/02656736.2024.2396122] [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: 05/24/2024] [Revised: 08/01/2024] [Accepted: 08/19/2024] [Indexed: 09/04/2024] Open
Abstract
Objective: Understansding the changing patterns of in vivo electrical properties for the target tissue is crucial for the accurate temperature monitoring and the treatment efficacy in thermal therapy. Our research aims to investigate the changing patterns and the reversibility of in vivo electrical properties for both healthy livers and liver tumors in a mouse model over a frequency range of 1 Hz to 1 MHz at temperatures between 30 °C to 90 °C. Methods and materials: The mice were anesthetized and the target organ was exposed. An 808-nm near-infrared laser was employed as the heating source to heat the organ in vivo. The four-needle electrode, connected to an impedance analyzer, was utilized to obtain the impedance at varying temperatures, which were monitored by a thermocouple. Results: The findings indicated a gradual decline in impedance with an increase in temperature. Furthermore, the impedance was normalized to that at 30 °C, and the real part of the normalized impedance was defined as the k-values, which range from 0 to 1. The results demonstrated a linear correlation between k-values and temperatures (R2 > 0.9 for livers and R2 > 0.8 for tumors). Significant differences were observed between livers and tumors at 1, 10 and 50 kHz (p < 0.05). Additionally, it was demonstrated that the electrical properties could be reversed when the temperature was below or equal to 45 °C. Conclusion: We believe that these results will contribute to the advancement of radiofrequency ablation systems and the development of techniques for temperature monitoring during liver thermal treatment.
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Affiliation(s)
- Yitong Guo
- Department of Biomedical Engineering, Shaanxi Provincial key Laboratory of Bioelectromagnetic Detection and Intelligent Perception, Air Force Medical University, Xi'an, China
- Department of Ultrasound Diagnosis, Tangdu Hospital, Air Force Medical University, Xi'an, China
| | - Weice Wang
- Department of Biomedical Engineering, Shaanxi Provincial key Laboratory of Bioelectromagnetic Detection and Intelligent Perception, Air Force Medical University, Xi'an, China
| | - Weichen Li
- Department of Biomedical Engineering, Shaanxi Provincial key Laboratory of Bioelectromagnetic Detection and Intelligent Perception, Air Force Medical University, Xi'an, China
- Department of Radiology, Functional and Molecular Imaging Key Lab of Shaanxi Province, Tangdu Hospital, Air Force Medical University, Xi'an, China
| | - Junyao Li
- Department of Biomedical Engineering, Shaanxi Provincial key Laboratory of Bioelectromagnetic Detection and Intelligent Perception, Air Force Medical University, Xi'an, China
| | - Mingxu Zhu
- Department of Biomedical Engineering, Shaanxi Provincial key Laboratory of Bioelectromagnetic Detection and Intelligent Perception, Air Force Medical University, Xi'an, China
| | - Ruteng Song
- Department of Biomedical Engineering, Shaanxi Provincial key Laboratory of Bioelectromagnetic Detection and Intelligent Perception, Air Force Medical University, Xi'an, China
| | - Wenjing Zhu
- Department of Biomedical Engineering, Shaanxi Provincial key Laboratory of Bioelectromagnetic Detection and Intelligent Perception, Air Force Medical University, Xi'an, China
- Institute of Medical Research, Northwest Polytechnical University, Xi'an, China
| | - Lei Wang
- Institute of Medical Research, Northwest Polytechnical University, Xi'an, China
| | - Zhenyu Ji
- Department of Biomedical Engineering, Shaanxi Provincial key Laboratory of Bioelectromagnetic Detection and Intelligent Perception, Air Force Medical University, Xi'an, China
| | - Xuetao Shi
- Department of Biomedical Engineering, Shaanxi Provincial key Laboratory of Bioelectromagnetic Detection and Intelligent Perception, Air Force Medical University, Xi'an, China
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Kim D, Lee J, Yoon J. Accurate estimation of the inhibition zone of antibiotics based on laser speckle imaging and multiple random speckle illumination. Comput Biol Med 2024; 174:108417. [PMID: 38603900 DOI: 10.1016/j.compbiomed.2024.108417] [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: 11/23/2023] [Revised: 03/01/2024] [Accepted: 04/04/2024] [Indexed: 04/13/2024]
Abstract
The antimicrobial susceptibility test (AST) plays a crucial role in selecting appropriate antibiotics for the treatment of bacterial infections in patients. The diffusion disk method is widely adopted AST method due to its simplicity, cost-effectiveness, and flexibility. It assesses antibiotic efficacy by measuring the size of the inhibition zone where bacterial growth is suppressed. Quantification of the zone diameter is typically achieved using tools such as rulers, calipers, or automated zone readers, as the inhibition zone is visually discernible. However, challenges arise due to inaccuracies stemming from human errors or image processing of intensity-based images. Here, we proposed a bacterial activity-based AST using laser speckle imaging (LSI) with multiple speckle illumination. LSI measures a speckle pattern produced by interferences of scattered light from the sample; therefore, LSI enables the detection of variation or movement within the sample such as bacterial activity. We found that LSI with multiple speckle illuminations provides consistent and uniform analysis of measured time-varying speckle images. Furthermore, our proposed method effectively identified the boundary of the inhibition zone using the k-means clustering algorithm, exploiting a result of speckle pattern analysis as features. Collectively, the proposed method offers a versatile analytical tool in the diffusion disk method.
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Affiliation(s)
- Donghyeok Kim
- Department of Energy Systems Research, Ajou University, Suwon, 16499, South Korea
| | - Jongseo Lee
- Department of Physics, Ajou University, Suwon, 16499, South Korea
| | - Jonghee Yoon
- Department of Physics, Ajou University, Suwon, 16499, South Korea.
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Zhang R, Fei L, Liu X, Sun Y, Xu X, Liu S, Liu Z, Xu L, Liu W. Widefield functional speckle-correlation optical scattering mesoscopy toward hemodynamic imaging. OPTICS LETTERS 2024; 49:1741-1744. [PMID: 38560851 DOI: 10.1364/ol.519610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 02/22/2024] [Indexed: 04/04/2024]
Abstract
Speckle-correlation optical scattering imaging (SCOSI) has shown the potential for non-invasive biomedical diagnostic applications, which directly utilizes the scattering patterns to reconstruct the deep and non-line-of-sight objects. However, the course of the translation of this technique to preclinical biomedical imaging applications has been postponed by the following two facts: 1) the field of view of SCOSI was significantly limited by the optical memory effect, and 2) the molecular-tagged functional imaging of the biological tissues remains largely unexplored. In this work, a proof-of-concept design of the first-generation widefield functional SCOSI (WF-SCOSI) system was presented for simultaneously achieving mesoscopic mapping of fluid morphology and flow rate, which was realized by implementing the concepts of scanning synthesis and fluorescence scattering flowmetry. The ex vivo imaging results of the fluorescence-labeled large-scale blood vessel network phantom underneath the strong scatters demonstrated the effectiveness of WF-SCOSI toward non-invasive hemodynamic imaging applications.
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El-Awaisi J, Kavanagh DPJ, Kalia N. Monitoring coronary blood flow by laser speckle contrast imaging after myocardial ischaemia reperfusion injury in adult and aged mice. Front Cardiovasc Med 2024; 11:1358472. [PMID: 38410244 PMCID: PMC10895051 DOI: 10.3389/fcvm.2024.1358472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 01/19/2024] [Indexed: 02/28/2024] Open
Abstract
Introduction Investigating coronary microvascular perfusion responses after myocardial infarction (MI) would aid in the development of flow preserving therapies. Laser speckle contrast imaging (LSCI) is a powerful tool used for real-time, non-contact, full-field imaging of blood flow in various tissues/organs. However, its use in the beating heart has been limited due to motion artifacts. Methods In this paper, we report the novel use of LSCI, combined with custom speckle analysis software (SpAn), to visualise and quantitate changes in ventricular perfusion in adult and aged mice undergoing ischaemia-reperfusion (IR) injury. The therapeutic benefit of inhibiting the actions of the pro-inflammatory cytokine interleukin-36 (IL-36) was also investigated using an IL-36 receptor antagonist (IL-36Ra). Results Imaging from uncovered and covered regions of the left ventricle demonstrated that whilst part of the LSCI flux signal was derived from beating motion, a significant contributor to the flux signal came from ventricular microcirculatory blood flow. We show that a biphasic flux profile corresponding to diastolic and systolic phases of the cardiac cycle can be detected without mathematically processing the total flux data to denoise motion artifacts. Furthermore, perfusion responses to ischaemia and postischaemia were strong, reproducible and could easily be detected without the need to subtract motion-related flux signals. LSCI also identified significantly poorer ventricular perfusion in injured aged mice following IR injury which markedly improved with IL-36Ra. Discussion We therefore propose that LSCI of the heart is possible despite motion artifacts and may facilitate future investigations into the role of the coronary microcirculation in cardiovascular diseases and development of novel therapies.
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Affiliation(s)
| | | | - Neena Kalia
- Microcirculation Research Group, Institute of Cardiovascular Sciences, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
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