3-D Microwave Holographic Imaging With Probe and Phase Compensations

Tsai, Chia-Liang; Chang, J.; Yang, Liang-Yu Ou; Chen, Shih‐Yuan

doi:10.1109/tap.2017.2768567

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…Here, although the background and object media are lossy and with different values of conductivity, we show that constructing and using an auxiliary system of equations in (10) still improves the quality of the images. It has been also mentioned in [32] that this approach still improves the quality of the images for slightly lossy media. Figure 6 shows the reconstructed images for the previous example (reduced number of antennas in the array) using such auxiliary system of equations.…”

Section: Studying the Feasibility Of Achieving Range Resolution With 2dmentioning

confidence: 91%

“…Figure 7 shows the imaging results for such cases. By comparing the images in this figure with those shown in Figure 4 (for D = 0.25λ), it is observed that for the lowest value of D (D = 0.125λ), the quality of [32] have been employed to improve the quality of the images. These results are with SNR = 20 dB.…”

Section: Studying the Feasibility Of Achieving Range Resolution With 2dmentioning

confidence: 98%

“…It has been discussed in [32] that if the contrast function has only real part (e.g., for lossless media), then the 2D FT of that would be a Hermitian function, that is,…”

Section: Studying the Feasibility Of Achieving Range Resolution With 2dmentioning

confidence: 99%

“…Since unknowns c i k x , k y are the same for the two systems of equations in (6) and (10), these two systems of equations can be combined into a single system of equations. As discussed in [32], this significantly reduces the condition number of the matrix of coefficients for the system of equations to be solved leading to solutions with better quality.…”

Section: Studying the Feasibility Of Achieving Range Resolution With 2dmentioning

confidence: 99%

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Three-Dimensional Holographic Imaging Using Single Frequency Microwave Data

Amineh

Ravan

Sharma

et al. 2018

International Journal of Antennas and Propagation

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Three-dimensional (3D) microwave and millimeter wave imaging techniques based on the holographic principles have been successfully employed in several applications such as security screening, body shape measurement for the apparel industry, underground imaging, and wall imaging. The previously proposed 3D holographic imaging techniques require the acquisition of wideband data over rectangular or cylindrical apertures. Requirement for wideband data imposes limitations on the hardware (in particular at very high or very low frequencies). It may also lead to errors in the produced images if the media is dispersive (e.g., in biomedical imaging) and not modeled properly in the image reconstruction process. To address these limitations, here, we propose a technique to perform 3D imaging with single frequency data. Instead of collecting data at multiple frequencies, we acquire the backscattered fields with an array of resonant antennas. We demonstrate the possibility of 3D imaging with the proposed setup and perform a comprehensive study of the capabilities and limitations of the technique via simulations. To perform a realistic study, the simulation data is contaminated by noise.

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Section: Studying the Feasibility Of Achieving Range Resolution With 2dmentioning

confidence: 91%

Section: Studying the Feasibility Of Achieving Range Resolution With 2dmentioning

confidence: 98%

“…It has been discussed in [32] that if the contrast function has only real part (e.g., for lossless media), then the 2D FT of that would be a Hermitian function, that is,…”

Section: Studying the Feasibility Of Achieving Range Resolution With 2dmentioning

confidence: 99%

Section: Studying the Feasibility Of Achieving Range Resolution With 2dmentioning

confidence: 99%

See 2 more Smart Citations

Three-Dimensional Holographic Imaging Using Single Frequency Microwave Data

Amineh

Ravan

Sharma

et al. 2018

International Journal of Antennas and Propagation

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“…마이크로파 홀로그래피에 대한 연구는 최근 이미지 재 형성의 정확도를 높이고, 속도를 빠르게 하는 방향으로 지속적으로 발전되고 있으며, Gao 등은 다른 주파수를 사 용한 간섭계를 적용하여 홀로그램을 획득한 후 이를 이 미지 재형성에 사용하였는데, Range 해상도와 Cross-range 해상도를 개선시켰음을 보이고 있으며, Range Migration 그림 24. Probe 및 위상 보정 마이크로파 홀로그래피 [56] Fig. 24.…”

Section: Classification Characteristicsunclassified

Brain Stroke Detection Based on Microwave Imaging

Cho¹

2020

J. Korean Inst. Electromagn. Eng. Sci.

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Brain stroke, referred to as a local neurological deficit suddenly caused by abnormal blood flow to brain tissue, is the third leading cause of death after heart disease and cancer. Additionally, because of its very short golden hour, initial treatment and access to diagnostic devices are critical. The main equipment for diagnosing brain stroke are CT and MRI, but it is difficult to carry out continuous tests and the equipment are not portable. CT is detrimental to patients because it uses ionizing radiation, leading to the demand for new devices. Microwave-based imaging technology is emerging as a medical imaging tool to replace CT, based on the mapping of the electromagnetic scattering resulting from the difference in dielectric constant between tissues. Microwave imaging has the advantages of viability, low cost, portability, and radioactivity throughout a living tissue. Hence, it is an excellent technique for diagnosing blood flow abnormalities in the brain and a good imaging tool for managing brain stroke. In this study, tomography imaging has been applied to head imaging to develop portable and relatively inexpensive imaging technology. Further, a method for generating a 3-D image using the time delay of the reflected wave from the target has been proposed. With the application of the holography technique to the microwave method, the microwave imaging-based stroke diagnosis will continue to evolve, improving the quality of life.

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References

2019

Real‐Time Three‐Dimensional Imaging of Dielectric Bodies Using Microwave/Millimeter‐Wave Holography

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3-D Microwave Holographic Imaging With Probe and Phase Compensations

Cited by 12 publications

References 25 publications

Three-Dimensional Holographic Imaging Using Single Frequency Microwave Data

Three-Dimensional Holographic Imaging Using Single Frequency Microwave Data

Brain Stroke Detection Based on Microwave Imaging

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