IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology最新文献

Employing Surface Waves for Characterizing Skin: Experimental Validation 利用表面波表征皮肤：实验验证

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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2025-04-09 DOI: 10.1109/JERM.2025.3555198

Shangyang Shang;Milad Mokhtari;Milica Popović

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Impact of MRI Field Strengths on Metasurface Enhancement MRI场强对超表面增强的影响

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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2025-04-01 DOI: 10.1109/JERM.2025.3548169

Robert Kowal;Lucas Knull;Max Joris Hubmann;Ivan Vogt;Daniel Düx;Florian Maier;Marcel Gutberlet;Bennet Hensen;Frank Wacker;Oliver Speck;Holger Maune

{"title":"Impact of MRI Field Strengths on Metasurface Enhancement","authors":"Robert Kowal;Lucas Knull;Max Joris Hubmann;Ivan Vogt;Daniel Düx;Florian Maier;Marcel Gutberlet;Bennet Hensen;Frank Wacker;Oliver Speck;Holger Maune","doi":"10.1109/JERM.2025.3548169","DOIUrl":"https://doi.org/10.1109/JERM.2025.3548169","url":null,"abstract":"Metasurfaces have proved valuable in magnetic resonance imaging (MRI) applications through modifying the field profiles of radiofrequency coils to enhance imaging. Using metasurfaces to enhance a conventional coil, such as the table-integrated spine coil, allows imaging with practically no cables inside the bore. This work investigated the fundamental relationship between an MRI system's field strength and the enhancement effect of a metasurface. We simulated and manufactured grid metasurfaces for field strengths of 0.55 Tesla (0.55 T), 1.5 T and 3 T and evaluated them experimentally. We found increased enhancements of the signal-to-noise ratio (SNR) with lower field strengths. At 0.55 T, the enhancement in the vicinity of the metasurface (10.9-fold) was measured 3.8 times higher than at 3 T. Moreover, the SNR decreased less with field strength next to the metasurface compared to the spine coil. Our results indicate the capability of metasurfaces in low field MRI systems and can stimulate further research. This could benefit future applications in MRI-guided interventions through simplified handling, as well as countries currently underserved with MRIs due to low manufacturing costs.","PeriodicalId":29955,"journal":{"name":"IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology","volume":"9 2","pages":"126-132"},"PeriodicalIF":3.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10946275","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology Publication Information 医学和生物学中的电磁学、射频和微波杂志

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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2025-03-22 DOI: 10.1109/JERM.2025.3568681

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IEEE Journal of Electromagnetics, RF, and Microwaves in Medicine and Biology About this Journal 医学和生物学中的电磁学、射频和微波

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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2025-03-22 DOI: 10.1109/JERM.2025.3568685

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Principal Component Regression for Broadband Microwave-Microfluidic Chemometrics on Small Sample Counts 基于小样本计数的宽带微波微流控化学计量学的主成分回归

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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2025-02-26 DOI: 10.1109/JERM.2025.3537462

Marie Mertens;Raphaël Trouillon;Tomislav Markovic;Ke Wu;Dominique Schreurs

{"title":"Principal Component Regression for Broadband Microwave-Microfluidic Chemometrics on Small Sample Counts","authors":"Marie Mertens;Raphaël Trouillon;Tomislav Markovic;Ke Wu;Dominique Schreurs","doi":"10.1109/JERM.2025.3537462","DOIUrl":"https://doi.org/10.1109/JERM.2025.3537462","url":null,"abstract":"While broadband dielectric spectroscopy enables label-free analysis of biological and chemical materials, extracting multiple concentrations from the data has remained a challenge. This work is one of the first demonstrations of simultaneous concentration extraction of three liquid constituents in a solution using broadband microwave spectroscopic data. Furthermore, the used methods eliminate the need for de-embedding or characterizing the measurement setup, simplifying the process. Advanced regression techniques such as Principal Component Regression (PCR) and Principal Least Squares (PLS) are applied to determine the concentrations of sodium chloride, glucose, and ethanol in water. As input data, <inline-formula><tex-math>$S$</tex-math></inline-formula>-parameters are measured between 0.5 and 26.5 GHz on a broadband coplanar waveguide sensor with a microfluidic container to transport the liquids. The training datasets consist of 27 and 34 samples, respectively. The mean absolute percentage error for sodium chloride predictions ranged from 3-5% for the different methods, while the minimal errors for glucose and ethanol predictions were 6-7% and 4-6%, respectively.","PeriodicalId":29955,"journal":{"name":"IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology","volume":"9 2","pages":"117-125"},"PeriodicalIF":3.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IEEE Journal of Electromagnetics, RF, and Microwaves in Medicine and Biology About this Journal 医学和生物学中的电磁学、射频和微波

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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2025-02-20 DOI: 10.1109/JERM.2025.3539041

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IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology Publication Information 医学和生物学中的电磁学、射频和微波杂志

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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2025-02-20 DOI: 10.1109/JERM.2025.3539043

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A GaAs MMIC Correlation-Dicke Radiometer With Compact Antenna for Internal Body Thermometry 一种具有紧凑天线的GaAs MMIC相关dick辐射计用于体内温度测量

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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2025-01-27 DOI: 10.1109/JERM.2024.3525405

Jooeun Lee;Zoya Popović

{"title":"A GaAs MMIC Correlation-Dicke Radiometer With Compact Antenna for Internal Body Thermometry","authors":"Jooeun Lee;Zoya Popović","doi":"10.1109/JERM.2024.3525405","DOIUrl":"https://doi.org/10.1109/JERM.2024.3525405","url":null,"abstract":"In this paper, we present a 1.4 GHz on-chip correlation-Dicke hybrid radiometer designed for internal body thermometry. The GaAs Monolithic Microwave Integrated Circuit (MMIC) measures 3.8 mm by 2.3 mm and includes two 90° hybrid couplers, a single-stage Low-Noise Amplifier (LNA) in each path, and a switch. The radiometer input is connected to a planar compact near-field circular slot-patch antenna placed on the skin and designed to receive noise power from subcutaneous tissues. To enhance robustness against input impedance mismatch, two single-stage LNAs are positioned between the two hybrid couplers. The circuit demonstrates a gain of 13.4 dB, isolation of 16 dB, and a noise figure of 1.31 dB. Following the switch, an off-the-shelf band-pass filter, an on-chip 3-stage LNA, and a detector are connected to provide a dc output proportional to the received thermal noise from the near-field antenna. Performance is evaluated through both phantom and in-vivo measurements. The 2-layer phantom measurement shows an average error of 0.35 °C, while in-vivo measurements show an average 0.72 °C error, demonstrating the device's ability to track internal temperature accurately. Additionally, repeatability tests are conducted on multiple human cheeks multiple times and on multiple days.","PeriodicalId":29955,"journal":{"name":"IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology","volume":"9 2","pages":"103-109"},"PeriodicalIF":3.0,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Broadband Wide-Angle Absorber for Microwave Imaging of Tissue 用于组织微波成像的宽带广角吸收器

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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2025-01-27 DOI: 10.1109/JERM.2025.3529656

Zhen-Yuan Zhang;Golap K. Dey;Nooshin V. Shahmirzadi;Natalia K. Nikolova

{"title":"Broadband Wide-Angle Absorber for Microwave Imaging of Tissue","authors":"Zhen-Yuan Zhang;Golap K. Dey;Nooshin V. Shahmirzadi;Natalia K. Nikolova","doi":"10.1109/JERM.2025.3529656","DOIUrl":"https://doi.org/10.1109/JERM.2025.3529656","url":null,"abstract":"A broadband wide-angle absorbing structure for the non-reflective termination of tissue is proposed for enclosures needed in microwave tissue imaging. A prototype consisting of 10 × 10 unit cells is fabricated and experimentally tested using breast-tissue phantoms. Through simulations and measurements, it is demonstrated that the proposed absorbing structure achieves a reflection coefficient better than −20 dB for TE polarization and better than −12 dB for TM polarization for incidence angles from 0° to 80° and within the frequency band from 3 GHz to 8 GHz. The design principles are delineated, enabling the development of other absorbing structures suitable for any tissue of interest. A calibration method and procedure are also developed and employed with the reported measurements, which allow for de-embedding the effect of the lossy tissue medium and extracting the intrinsic reflection coefficient of the absorber. The proposed structure demonstrates superior absorption compared to prior designs and provides a much-needed solution for the construction of non-reflective enclosures for microwave biomedical imaging applications.","PeriodicalId":29955,"journal":{"name":"IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology","volume":"9 2","pages":"133-140"},"PeriodicalIF":3.0,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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2024 Index IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology Vol. 8 电磁学，射频和微波在医学和生物学第8卷

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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2024-12-11 DOI: 10.1109/JERM.2024.3512633

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