Inverse scattering problems of near-field subsurface pulse diagnostics

Gaikovich, K. P.; Maksimovitch, Yelena; Sumin, M. I.

doi:10.1080/17415977.2017.1417405

Cited by 9 publications

(14 citation statements)

References 16 publications

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“…In near-field MWI, spatial distributions of the electric field magnitude are important measures of antenna performance, which is affected by the impact of evanescent k-space contributions [ 37 ]. To evaluate performance in the near field, we have used our simulation setup to calculate examples of spatial distributions due to the transmitting antenna with and without the MTS loading.…”

Section: Resultsmentioning

confidence: 99%

Metasurface-Enhanced Antennas for Microwave Brain Imaging

Razzicchia

Guo

et al. 2021

Diagnostics

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Stroke is a very frequent disorder and one of the major leading causes of death and disability worldwide. Timely detection of stroke is essential in order to select and perform the correct treatment strategy. Thus, the use of an efficient imaging method for an early diagnosis of this syndrome could result in an increased survival’s rate. Nowadays, microwave imaging (MWI) for brain stroke detection and classification has attracted growing interest due to its non-invasive and non-ionising properties. In this paper, we present a feasibility study with the goal of enhancing MWI for stroke detection using metasurface (MTS) loaded antennas. In particular, three MTS-enhanced antennas integrated in different brain scanners are presented. For the first two antennas, which operate in a coupling medium, we show experimental measurements on an elliptical brain-mimicking gel phantom including cylindrical targets representing the bleeding in haemorrhagic stroke (h-stroke) and the not oxygenated tissue in ischaemic stroke (i-stroke). The reconstructed images and transmission and reflection parameter plots show that the MTS loadings improve the performance of our imaging prototype. Specifically, the signal transmitted across our head model is indeed increased by several dB‘s over the desired frequency range of 0.5–2.0 GHz, and an improvement in the quality of the reconstructed images is shown when the MTS is incorporated in the system. We also present a detailed simulation study on the performance of a new printed square monopole antenna (PSMA) operating in air, enhanced by a MTS superstrate loading. In particular, our previous developed brain scanner operating in an infinite lossy matching medium is compared to two tomographic systems operating in air: an 8-PSMA system and an 8-MTS-enhanced PSMA system. Our results show that our MTS superstrate enhances the antennas’ return loss by around 5 dB and increases the signal difference due to the presence of a blood-mimicking target up to 25 dB, which leads to more accurate reconstructions. In conclusion, MTS structures may be a significant hardware advancement towards the development of functional and ergonomic MWI scanners for stroke detection.

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Section: Resultsmentioning

confidence: 99%

Metasurface-Enhanced Antennas for Microwave Brain Imaging

Razzicchia

Guo

et al. 2021

Diagnostics

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“…В нашем случае это распределение вычисляется встроенной в измерительную систему программой. Из (6) получается разложение зондирующего поля по плоским волнам:…”

Section: Y X X Y Y Z Z Dx Dyunclassified

“…( ) , , , , ) [3,4,6] был применен метод определения ядер уравнений (13), ( 16) из эксперимента с тонкими прямоугольными образцами с известной диэлектрической проницаемостью на различных глубинах в исследоуемой среде.…”

Section: Y X X Y Y Z Z Dx Dyunclassified

“…К настоящему времени были развиты и апробированы в экспериментах различные методы ближнепольной диагностики подповерхностных диэлектрических неоднородностей, основанные на решении обратных задач ближнепольного рассеяния [1][2][3][4][5][6][7][8][9]. Данный подход позволяет реализовать субволновую разрешающую способность, что особенно важно в сильнопоглощающих средах -таких, как живые ткани, где невозможно использование в зондировании более коротких длин волн из-за сильного поглощения на высоких частотах.…”

Section: Introductionunclassified

“…В [16,17] [6]. Согласно [6], принимаемый импульс ( , ) pr st r может быть вычислен по комплексным амплитудам ( , ) , , ,…”

Section: Introductionunclassified

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Dynamic near-field microwave diagnostics of lungs.

Bokeria¹,

Kakuchaya²,

Kuular³

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Results of theoretical and experimental studies of the method of the near-field microwave tomography of the thorax are presented. Integral equations of inverse tomography problem of 3D blood- and air content inhomogeneities by data of multisensory measurements are obtained. Methods of air and blood content profiling in processes of breathing and heart activity by data of bistatic measurements of the scattered signal are proposed and solving algorithms of inverse problems are studied in the numerical simulation. Multifrequency and pulse measurements of scattered signals are carried out in processes of cardiorespiratory activity. By data of bistatic measurements of scattered signals parameters from the thorax, profiling relative air- and blood content profiles has been realized. Application possibilities of the method in the biomedical diagnostics are considered.

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Left-handed lens tomography and holography

Gaikovich

2018

Inverse Problems in Science and Engineering

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Inverse scattering problems of near-field subsurface pulse diagnostics

Cited by 9 publications

References 16 publications

Metasurface-Enhanced Antennas for Microwave Brain Imaging

Metasurface-Enhanced Antennas for Microwave Brain Imaging

Dynamic near-field microwave diagnostics of lungs.

Left-handed lens tomography and holography

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