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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、射频和微波杂志
IF 3.2 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-20 DOI: 10.1109/JERM.2026.3663038
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引用次数: 0
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
IF 3.2 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-20 DOI: 10.1109/JERM.2026.3663034
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引用次数: 0
Design of Mechanical Durable TMS Coils for Safe Operation in High-Field MRI Environments 高场MRI环境下安全运行的机械耐用TMS线圈设计
IF 3.2 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-01-28 DOI: 10.1109/JERM.2025.3649258
Jose A. Vílchez Membrilla;Víctor Salas Moreno;Maria A. Koponen;Victor H. Souza;Mario F. Pantoja;Risto J. Ilmoniemi;Clemente Cobos Sánchez
Objective: Interleaving transcranial magnetic stimulation with magnetic resonance imaging (TMS–MRI) is a promising tool for neuroscience. However, its development is limited by the strong interactions between the TMS current pulse and the high magnetic field present within the MRI environment. The objective of this study is to develop methodologies for designing TMS coils that can operate safely inside MRI scanners. Methods: By using an inverse boundary element method design framework, we study the effects of controlling different norms of the Lorentz force in the design process to produce more durable TMS coils. We apply this method to design rodent–specific TMS coils capable of withstanding the high static magnetic fields present in small animal MRI scanners. The performance of the proposed TMS coils is validated under realistic simulations using practical coil plate materials and pulses in the COMSOL Multiphysics software. Results: The numerical simulations indicate that minimising the maximum magnitude ($l^{infty}$ norm) of the Lorentz force distribution produces TMS coils with improved mechanical behaviour when operating within an MRI environment. Significance: The proposed design strategy offers an effective solution for producing TMS coils with enhanced mechanical durability. This improvement may be particularly valuable to address the current challenges faced in interleaved TMS–MRI applications.
目的:经颅磁刺激与磁共振成像(TMS-MRI)相结合是一种很有前途的神经科学研究工具。然而,它的发展受到TMS电流脉冲与MRI环境中存在的高磁场之间的强相互作用的限制。本研究的目的是开发设计可以在MRI扫描仪内安全操作的TMS线圈的方法。方法:采用逆边界元法设计框架,研究了在设计过程中控制不同洛伦兹力规范对TMS线圈耐用性的影响。我们将这种方法应用于设计啮齿动物专用的TMS线圈,该线圈能够承受小动物MRI扫描仪中存在的高静态磁场。在COMSOL Multiphysics软件中,利用实际的线圈板材料和脉冲,对所提出的TMS线圈的性能进行了仿真验证。结果:数值模拟表明,在MRI环境中操作时,最小化洛伦兹力分布的最大幅度($l^{infty}$范数)可以使TMS线圈的机械性能得到改善。意义:提出的设计策略为生产具有增强机械耐久性的TMS线圈提供了有效的解决方案。这一改进可能对解决当前交叉TMS-MRI应用面临的挑战特别有价值。
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引用次数: 0
Analysis of an Implantable Antenna Made From a Biocompatible Nanocomposite Polymer Film 生物相容性纳米复合聚合物薄膜可植入天线的研究
IF 3.2 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-12-30 DOI: 10.1109/JERM.2025.3641620
Chase C. Griswold;Cynthia M. Furse
We assess the efficacy of a new biocompatible conductive nanocomposite polymer (CNCP) ink for implantable antenna development at 433 MHz, the ISM band closest to the MedRadio band (402–405 MHz). We compare the statistical variations of the reflection coefficients (S11) of a strip dipole antenna made from a biocompatible CNCP film or copper (which is not biocompatible but serves as a model of the best possible antenna) at different locations in a pork testbed. We also measure the statistical variability of tissue properties (relative permittivity and electrical conductivity) of four different pork phantom testbed models from 300–500 MHz. Testbeds include ground pork (compressed or not) with or without a layer of shortening (fat). All antennas are assessed in an uncompressed testbed with a layer of fat. These measurements quantify how variation in tissue properties results in detuning of the antenna.
我们评估了一种新的生物相容性导电纳米复合聚合物(CNCP)墨水在433 MHz(最接近MedRadio频段(402-405 MHz)的ISM频段)用于植入式天线开发的功效。我们比较了由生物相容性CNCP薄膜或铜(不具有生物相容性,但可作为最佳天线模型)制成的带状偶极子天线在猪肉试验台不同位置的反射系数(S11)的统计变化。我们还测量了组织特性(相对介电常数和电导率)在300-500 MHz范围内的四种不同猪肉模型的统计变异性。试验台包括碎猪肉(压缩或不压缩),有或没有一层起酥油(脂肪)。所有的天线都在一个未压缩的试验台上进行评估,试验台上有一层脂肪。这些测量量化了组织特性的变化是如何导致天线失谐的。
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引用次数: 0
A Dielectric Model and Phantom Development to Emulate Bone Loss At Microwave Frequencies 微波频率下模拟骨丢失的介电模型和模型开发
IF 3.2 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-12-22 DOI: 10.1109/JERM.2025.3627888
Allyanna Rice;Asimina Kiourti
The dielectric contrast between healthy and osteoporotic bones can be monitored using microwave techniques. However, previously reported values of bone dielectric properties are inconclusive: significant variations exist due to different sample types, preservation methods, and measurement techniques. To overcome these limitations, we present an anatomically accurate dielectric model of bone loss in the trabecular bone at microwave frequencies along with accompanying phantoms. Specifically, bone volume fractions (BVFs), or ratios of red bone marrow to trabecular bone, are developed with dielectric mixing equations to represent various stages of bone loss. The dielectric properties for BVFs of 10% and 40% are calculated for realistic representation of bone loss in simulations. Then, semi-solid phantoms for emulating bone loss from 0.75 to 5 GHz are developed for experimentation. The phantoms are composed of sunflower oil, salt water, gelatin, and dish soap. The average percent error between the permittivity and conductivity of the proposed simulation model and the fabricated phantom is 4.30% and 8.38% for a BVF of 10% and 5.57% and 6.58% for a BVF of 40%, respectively, from 0.75 to 5 GHz. This work is the first to consider the dielectric properties of red bone marrow as a critical factor in monitoring bone loss in the trabecular bone regions at microwave frequencies. Additionally, this work develops the first known phantoms for emulating bone loss. The proposed dielectric model and semi-solid phantoms can be used for realistic simulation, testing, and development of microwave sensing and imaging systems for bone loss prior to human testing.
利用微波技术可以监测健康骨和骨质疏松骨之间的介电对比。然而,先前报道的骨介电性能值是不确定的:由于不同的样品类型、保存方法和测量技术,存在显著的差异。为了克服这些限制,我们提出了一个解剖学上精确的微波频率下骨小梁骨丢失的介电模型以及伴随的幻象。具体地说,骨体积分数(BVFs),或红骨髓与骨小梁的比率,用介电混合方程来表示骨质流失的各个阶段。在模拟中,计算了10%和40% BVFs的介电性能,以真实地表示骨质流失。然后,开发了模拟0.75 ~ 5 GHz骨丢失的半固体模型用于实验。这些幻影是由葵花籽油、盐水、明胶和洗洁精组成的。在0.75 ~ 5 GHz范围内,当BVF为10%时,仿真模型的介电常数和电导率与实际制作的模体的平均误差分别为4.30%和8.38%;当BVF为40%时,仿真模型的介电常数和电导率与实际制作的模体的平均误差分别为5.57%和6.58%。这项工作是第一个考虑到在微波频率下红骨髓的介电特性是监测骨小梁区域骨质流失的关键因素。此外,这项工作开发了第一个已知的模拟骨质流失的幻影。所提出的介电模型和半固体模型可以用于真实的模拟,测试和开发微波传感和成像系统,用于人体测试之前的骨质流失。
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引用次数: 0
Multi-Harmonics Amplitude Analysis via Space-Time Coding Enabled Spatial-Spectral Mapping for Target Angle Estimation and Vital Sign Monitoring 基于空时编码的多谐波幅值分析实现了目标角度估计和生命体征监测的空谱映射
IF 3.2 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-12-22 DOI: 10.1109/JERM.2025.3633717
Shuping Li;Donglin Gao;Minning Zhu;Chung-Tse Michael Wu
This work presents a novel space-time-coding (STC)-enabled radar sensor that leverages spatial-spectral mapping for target angle estimation and vital sign monitoring (VSM). The implemented prototype integrates a 1-to-5 unequal Wilkinson power divider and five patch antennas with direct antenna modulation (DAM), digitally controlled via an FPGA. By manipulating received signals into multiple harmonics as a function of incident angle, the STC array enables multi-harmonic amplitude analysis for angular localization. Experimental validation demonstrates accurate DOA estimation across an angular range of –70$^{circ }$ to +70$^{circ }$, within the acceptable $pm 7.5^{circ }$ tolerance defined by the physical width of the human torso (33–41 cm), at a distance of 1.2 m. Furthermore, vital sign information extracted from the harmonic corresponding to the estimated angle range exhibits strong agreement with the ground truth. Unlike conventional DOA techniques, the proposed method operates using a single-channel over-the-air signal and does not require complex signal processing algorithms, offering a low-complexity and scalable solution for indoor biomedical and smart home applications.
这项工作提出了一种新型的时空编码(STC)雷达传感器,它利用空间光谱映射进行目标角度估计和生命体征监测(VSM)。实现的原型集成了1对5不等威尔金森功率分配器和5个带直接天线调制(DAM)的贴片天线,通过FPGA进行数字控制。通过将接收到的信号作为入射角的函数处理成多个谐波,STC阵列可以进行多谐波幅度分析以进行角度定位。实验验证表明,在1.2 m距离上,在由人体躯干物理宽度(33-41 cm)定义的可接受的7.5^{circ}$公差范围内,在-70 $^{circ}$到+70$^{circ}$角度范围内,准确的DOA估计。此外,从估计角度范围对应的谐波中提取的生命体征信息与地面真实值具有较强的一致性。与传统的DOA技术不同,该方法使用单通道无线信号,不需要复杂的信号处理算法,为室内生物医学和智能家居应用提供了低复杂性和可扩展的解决方案。
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引用次数: 0
Clutter Removal Techniques for Medical Microwave Imaging 医学微波成像杂波去除技术
IF 3.2 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-12-08 DOI: 10.1109/JERM.2025.3634560
Md Abdul Awal;Lei Guo;Kamel Sultan;Amin Abbosh
Microwave imaging has emerged as a promising modality for various biomedical applications, offering advantages such as portability, non-ionizing radiation, cost-effectiveness, and real-time scanning. However, clutter, unwanted signals from strong reflections, and different types of tissue interactions complicate imaging and hinder accurate diagnosis. This study provides a comprehensive review and comparative analysis of clutter removal algorithms in microwave imaging. Traditional clutter-removal methods, such as differential subtraction, average subtraction, symmetric subtraction, and adjacent subtraction, have been widely used for their fast processing and simplicity but often fall short in producing high-quality, clutter-free images. More sophisticated methods, such as Empirical Mode Decomposition (EMD)-based, Singular Value Decomposition (SVD)-based, spatial filtering, entropy-based, and entropy-Wiener filter-based techniques, offer improved performance but still do not meet clinical standards. To guide and motivate researchers working in this area, this review not only discusses clutter removal algorithms, but also investigates the performance of key algorithms across various environments, from simple homogeneous to complex heterogeneous domains, and highlights those used in clinical environments. This review also suggests that AI methods guided by the physics of the problem could offer a potential solution; however, they are computationally and data-intensive. This is a challenge considering the limited clinical data from microwave imaging systems.
微波成像已成为各种生物医学应用的一种有前途的方式,具有便携性、非电离辐射、成本效益和实时扫描等优点。然而,杂波、来自强反射的无用信号和不同类型的组织相互作用使成像复杂化,阻碍了准确的诊断。本文对微波成像中的杂波去除算法进行了全面的综述和比较分析。传统的杂波去除方法,如微分减法、平均减法、对称减法和相邻减法,因其处理速度快、简单而被广泛使用,但往往无法产生高质量、无杂波的图像。更复杂的方法,如基于经验模态分解(EMD)、基于奇异值分解(SVD)、空间滤波、基于熵和基于熵-维纳滤波器的技术,性能有所提高,但仍未达到临床标准。为了指导和激励在这一领域工作的研究人员,本文不仅讨论了杂波去除算法,还研究了从简单同构到复杂异质域的各种环境下关键算法的性能,并重点介绍了在临床环境中使用的算法。这篇综述还表明,由问题的物理学指导的人工智能方法可能提供一个潜在的解决方案;然而,它们是计算和数据密集型的。考虑到微波成像系统有限的临床数据,这是一个挑战。
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引用次数: 0
Wearable Textile-Based Dual-Band 8-Element Rectenna Array for Polarization Independent Far-Field RF Energy Harvesting 基于可穿戴织物的偏振无关远场射频能量采集双波段8元整流天线阵列
IF 3.2 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-12-04 DOI: 10.1109/JERM.2025.3636066
Nasir Ullah Khan;Abdul Basir;Arcangelo Merla;Toni Björninen
This study introduces a dual-band wearable 8-element rectenna for self-powered wearable sensors based on far-field RF energy harvesting at 2.45 and 5.8 GHz. The array was patterned on a textile substrate by laser-cutting a conductive textile and tested in body-worn configuration for both radiation pattern and RF-to-DC conversion properties. It comprises eight monopole-type dual-band element antennas, arranged in a circular configuration that ensures 50$%$ combined mutual polarization efficiency with an incident electromagnetic wave impinging on it regardless of the wave's polarization. Single element exhibits the gain of 2.5 dBi at 2.45 GHz and 5.7 dBi at 5.8 GHz with the corresponding input reflection coefficients below $-$15 dB in the body-worn configuration. The mutual coupling between the elements remains well below $-$20 dB at both operating frequencies. With the serial-type DC-combining approach, this yielded a stable 1.8 V output DC voltage from the rectenna array over a 4 k$Omega$ load.
本研究介绍了一种基于2.45 GHz和5.8 GHz远场射频能量采集的双频可穿戴8元整流天线,用于自供电可穿戴传感器。该阵列通过激光切割导电纺织品在纺织衬底上进行图案化,并在人体磨损配置下测试辐射方向图和rf - dc转换特性。它包括8个单极型双频元件天线,以圆形配置排列,确保与入射电磁波碰撞时50%的组合互极化效率,而不管波的极化如何。单元件在2.45 GHz时的增益为2.5 dBi,在5.8 GHz时的增益为5.7 dBi,相应的输入反射系数在$-$15 dB以下。在两个工作频率下,元件之间的相互耦合保持在$-$20 dB以下。采用串行型直流组合方法,在4 k ω负载下,从整流天线阵列产生稳定的1.8 V输出直流电压。
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引用次数: 0
2025 Index IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology 电磁、射频和微波在医学和生物学中的应用
IF 3.2 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-11-27 DOI: 10.1109/JERM.2025.3638178
{"title":"2025 Index IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology","authors":"","doi":"10.1109/JERM.2025.3638178","DOIUrl":"https://doi.org/10.1109/JERM.2025.3638178","url":null,"abstract":"","PeriodicalId":29955,"journal":{"name":"IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology","volume":"9 4","pages":"525-542"},"PeriodicalIF":3.2,"publicationDate":"2025-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11270968","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145612145","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}
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
IF 3.2 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2025-11-21 DOI: 10.1109/JERM.2025.3632492
{"title":"IEEE Journal of Electromagnetics, RF, and Microwaves in Medicine and Biology About this Journal","authors":"","doi":"10.1109/JERM.2025.3632492","DOIUrl":"https://doi.org/10.1109/JERM.2025.3632492","url":null,"abstract":"","PeriodicalId":29955,"journal":{"name":"IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology","volume":"9 4","pages":"C3-C3"},"PeriodicalIF":3.2,"publicationDate":"2025-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11263960","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145560681","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}
引用次数: 0
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IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology
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