- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Three-dimensional holographic imaging using data collected over cylindrical apertures
摘要： The previously proposed near-field holographic imaging algorithms are based on the data collected over rectangular apertures. In this letter, we propose an approach for three-dimensional near-field holographic imaging with data collected over cylindrical apertures. Circular deconvolution is employed to deal with the periodicity of the functions along the azimuthal direction.
关键词： holography,microwave imaging,non-destructive testing
更新于2025-09-23 15:23:52
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Two-Dimensional Imaging Based on Near-Field Focused Array Antenna
摘要： In this letter, a near-field focused array antenna is applied to two-dimensional (2-D) microwave imaging, which steers its focus on the designed focal plane by changing the operating frequency and by phase control in two directions, respectively. The imaging system is composed of this array and two microstrip antennas, as receiver and transmitters, respectively. Simulations and measurements have proved the feasibility of the image reconstruction approach. The proposed method has a high imaging speed due to fast electrical beam scan, and thanks to the frequency scan performance of the array in one dimension, it also shows low-cost property against the fully phased method.
关键词： near-field focused beams,Microwave imaging,phased arrays,reconstruction algorithm
更新于2025-09-23 15:23:52
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Bistatic SAR: Forecasting Spatial Resolution
摘要： This paper derives closed form expressions for bistatic synthetic aperture radar spatial resolution of a generalized system from the k-space or the wavenumber domain. These spatial resolution equations have not previously appeared in the literature. From these equations, significant resolution is found in both range and cross-range forecasting a forward-scatter bistatic synthetic aperture radar image when the elevation angles of each bistatic platform are significantly different. Simulation and lab tests demonstrated the forward scatter resolution.
关键词： image resolution,synthetic aperture radar,radar remote sensing,spatial resolution,radar imaging,bistatic radar,microwave imaging
更新于2025-09-23 15:22:29
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Tissue-mimicking materials for breast phantoms up to 50 GHz
摘要： Millimeter (mm)-wave imaging has been recently proposed as a new technique for breast cancer detection, based on the significant dielectric contrast between healthy and tumor tissues. Here we propose a procedure to fabricate, electromagnetically characterize and preserve realistic breast tissue-mimicking phantoms for testing mm-wave imaging prototypes. Low-cost, non-toxic and easy-to-produce mixtures made of sunflower oil, water and gelatin were prepared and their dielectric properties were for the first time measured in the [0.5-50] GHz frequency range using a coaxial probe kit. Different oil and gelatin percentages were tested. An alternative recipe based on a waste-oil hardener was also proposed. Finally, water and sunflower oil were investigated as preservation media. The mixtures electromagnetic properties were in good agreement with those of human breast ex vivo samples. By changing the ingredient concentrations or using different solidifying agents it was possible to mimic different tissue types. Besides, we show that sunflower oil represents an effective preservation medium for the developed materials. The first breast phantom mimicking a tumor mass into healthy tissues up to 50 GHz was also successfully fabricated. Results demonstrated the potential of the designed recipes to mimic breast tissues with different biological characteristics.
关键词： microwave imaging,breast phantoms,breast cancer,dielectric properties,millimeter waves,cancer screening
更新于2025-09-23 15:22:29
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Bowtie Antenna TRM Design for Biomedical Imaging Using Electromagnetic Time Reversal Technique
摘要： Microwave based imaging has been extensively examined for biomedical imaging and research is still ongoing to attain best imaging systems. Examination and detection of dielectric property differences of biological tissues has been examined over a wide range of frequencies for such applications. This paper looks at the design of a wide dual band Bowtie time reversal mirror (TRM) for biomedical imaging using electromagnetic time reversal technique resonating at 2.45 GHz and 5.2 GHz.
关键词： microwave imaging,microstrip bowtie antenna,time reversal mirrors,Electromagnetic time reversal
更新于2025-09-23 15:22:29
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[IEEE 2017 IEEE 17th International Conference on Bioinformatics and Bioengineering (BIBE) - Washington, DC (2017.10.23-2017.10.25)] 2017 IEEE 17th International Conference on Bioinformatics and Bioengineering (BIBE) - A novel low-complexity framework in ultra-wideband imaging for breast cancer detection
摘要： In this research work, a novel framework is proposed as an efficient successor to traditional imaging methods for breast cancer detection in order to decrease the computational complexity. In this framework, the breast is divided into segments in an iterative process and in each iteration, the one having the most probability of containing tumor with lowest possible resolution is selected by using suitable decision metrics. After finding the smallest tumor-containing segment, the resolution is increased in the detected tumor-containing segment, leaving the other parts of the breast image with low resolution. Our framework is applied on the most common used beamforming techniques, such as delay and sum (DAS) and delay multiply and sum (DMAS) and according to simulation results, our framework can decrease the computational complexity significantly for both DAS and DMAS without imposing any degradation on accuracy of basic algorithms. The amount of complexity reduction can be determined manually or automatically based on two proposed methods that are described in this framework.
关键词： breast cancer detection,low complexity computational methods,DAS,DMAS,Microwave imaging
更新于2025-09-23 15:21:21
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New Perspectives in Breast Imaging || Near-Field Radar Microwave Imaging as an Add-on Modality to Mammography
摘要： According to global statistics, there is a high incidence of cancer in western countries; and, due to the limited resources available in most healthcare systems, it seems like one of the most feasible options to fight against cancer might be strict prevention policies—such as eliminating carcinogens in people’s daily lives. Nevertheless, early cancer detection and effective treatment are still necessary, and understanding their efficacy and limitations are important issues that need to be addressed in order to ultimately enhance patients’ survival rate. In the case of breast cancer, some of the problems faced by conventional mammography have been addressed in the literature; they include high rate of false-positive and false-negative results, as well as the possibility of overdiagnosis. New technologies, such as digital breast tomosynthesis (DBT), have been able to improve the sensitivity and specificity by using 3D imaging. However, the low contrast (1%) existing between tumors and healthy fibroglandular tissue at X-ray frequencies has been identified as one of the main causes of misdiagnosis in both conventional 2D mammography and DBT. Near-field radar imaging (NRI) provides a unique opportunity to overcome this problem, since the contrast existing between the aforementioned tissues is intrinsically higher (10%) at microwave frequencies. Moreover, the low resolution and highly complex scattering patterns of microwave systems can be enhanced by using prior information from other modalities, such as the DBT. Therefore, a multimodal DBT/NRI imaging system is proposed to exploit their individual strengths while minimizing their weaknesses. In this work, the foundation of this idea is reviewed, and a preliminary design and experimental validation of the NRI system, used as a DBT complement, is introduced.
关键词： breast cancer statistics,digital breast tomosynthesis,microwave imaging,antipodal Vivaldi antennas,near-field radar imaging,breast cancer detection
更新于2025-09-23 15:21:01
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Terahertz Bragg Resonator based on a Mechanical Assembly of Metal Grating and Metal Waveguide
摘要： The physical contrast sensitivity of microwave imaging systems employing scattering-parameter measurements is defined. Methodologies are proposed for its evaluation through measurements and through simulations. This enables the estimation of the smallest detectable target permittivity contrast or size for the system under evaluation. The outcomes of the proposed simulation-based and measurement-based methods are compared for the case of a realistic tissue-imaging system. The agreement between the simulated and measured sensitivity estimation validates the proposed methods. The intention of the proposed methodology is to provide common means to quantify and compare the sensitivity performance of microwave systems used in tissue imaging as well as the antennas used as sensors. We emphasize that the proposed method targets the performance of the hardware and it is not concerned with the image-reconstruction algorithms.
关键词： microwave imaging,tissue sensing,Antenna measurements,receiver sensitivity,response sensitivity,physical contrast sensitivity (PCS)
更新于2025-09-23 15:21:01
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Near-Field Imaging Analysis of Three-Dimensional MIMO Array
摘要： This paper presents a MIMO imaging system, which has good imaging effect and higher resolution. The equations for the position of antennas are deduced in detail. The proposed algorithm is used to carry out inverse scattering microwave image through the near-field scattered electric field which is obtained by the simulation software. The formulas of imaging resolution of MIMO antenna array are presented in this paper. The main factors which influence the quality of the image are analyzed, and the accuracy and feasibility of the resolution formula are verified by the simulation of complex object, which provides a valuable reference method for the actual microwave imaging system.
关键词： MIMO imaging system,microwave imaging,resolution,near-field imaging,antenna array
更新于2025-09-23 15:19:57
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[IEEE 2019 10th International Conference on Computing, Communication and Networking Technologies (ICCCNT) - Kanpur, India (2019.7.6-2019.7.8)] 2019 10th International Conference on Computing, Communication and Networking Technologies (ICCCNT) - A Novel Miniaturized Coplanar Waveguide Fed Tapered Slot Ultra Wide Band Vivaldi Antenna For Microwave Imaging Applications
摘要： This article proposed a novel miniaturized design of coplanar wave guide (CPW) fed ultra wide band (UWB) imaging tapered applications. Broken line exponential tapered profile and different types of slots have been incorporated in order to obtain the better performance and miniaturized antenna. All important performance parameters of the proposed the antenna such as return loss, BW, gain, directivity, VSWR, axial ratio, front to back ratio, accepted power, radiated power, surface current, radiation efficiency have been analyzed and enhanced up to the acceptable level. Finally, from the simulated validation, it is noticed that the proposed antenna would be a potential candidate for microwave imaging applications.
关键词： CST,UWB,Microwave Imaging,CPW,Vivaldi antenna
更新于2025-09-16 10:30:52