Research of a microwave radiometer for monitoring of internal temperature of biological tissues

Vesnin, Sergey; Sedankin, M. K.; Leushin, V. Yu.; Skuratov, Victor; Nelin, Igor; Konovalova, Anastasiia

doi:10.15587/1729-4061.2019.176357

Cited by 10 publications

(3 citation statements)

References 32 publications

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“…The antenna diameter is 24 mm, the height is 5 mm. The antenna configuration is similar to that presented in (Vesnin, et al, 2019). It follows from the conducted test that the experimentally measured coefficient H is equal to 1, what corresponds to formula (21).…”

Section: Pilot Studiesmentioning

confidence: 94%

Portable microwave radiometer for wearable devices

Vesnin

Sedankin

Ovchinnikov

et al. 2021

Nexo Revista Científica

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This paper presents a new circuit of the miniature microwave radiometer for wearable devices, which can be used to monitor the core body temperature (CBT) of internal human tissues continuously 24/7. The measurement results of the proposed device, as opposed to the known miniature wearable radiometers, remain unchanged when the impedance of the examined area varies. We have derived an analytical expression for radiometer measurement error based on parameters of device components. This formula allows accuracies to be estimated and optimal parameters of the circuit to be selected to minimise measurement error at a design stage. It is shown that measurement error is independent of the antenna reflection coefficient and the temperature of the radiometer front-end. A prototype of the single-channel miniature radiometer has 32 х 25 х 14 mm3 dimensions and USB interface communication with PC. A 28-hour run of the device has shown that it is highly stable, and a maximum drift in temperature is 0.15 ̊C. Operating frequency range was 3400-4100 MHz, supply voltage - 5V; power supply of the radiometer in measurement mode is 210 mA; time constant of the radiometer without being averaged is 0.6 sec, at the same time, standard deviation δ = 0.17 ̊С, with further averaging during 4 sec δ=0.052 ̊С, with averaging during 30 sec δ =0.017 ̊C; when there were input reflections R2=0.25, an error in measuring brightness temperature shifted by 0.2 ̊ C; with 10 ̊C variations in ambient temperature the shift was 0.15 ̊C. Introduction of self-contained power supply and wireless communication with smartphone have made it possible to use the proposed radiometer as a wearable device to monitor the temperature of internal tissues and CBT during human activities.

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Section: Pilot Studiesmentioning

confidence: 94%

Portable microwave radiometer for wearable devices

Vesnin

Sedankin

Ovchinnikov

et al. 2021

Nexo Revista Científica

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“…Данный метод показал свою эффективность в качестве скринингового метода обследования различных заболеваний, таких как: рак молочной железы [2; 8; 9], травмы головного мозга [1], заболевания суставов и вен [5; 12], проблемы мочеполовой системы [4] и других [6; 13]. Метод МВР позволяет измерять температуры как на поверхности тела, так и на некоторой его глубине, фиксируя излучения биологического тела в разных диапазонах [15].…”

Section: Introductionunclassified

Analysis of Brain Thermometric Data Obtained by Microwave Radiothermometry

Popov,

Krylova

2023

MPCS

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This paper discusses the effectiveness of using the method of microwave radiothermometry in examinations of brain diseases, namely the state of disordered consciousness. In contrast to most methods of examinations by this method, the measurements of the brain were carried out in only 2 different frontal areas for 2 days with a frequency of 4 hours. Therefore, the aim of the study was to identify the effectiveness of a diagnostic model based on the dynamics of temperature changes. The work showed that in healthy patients there is a circadian rhythm: during the day the temperature rises, at night it decreases. At the same time, such dynamics is not observed in patients with disordered consciousness. Based on this knowledge, a conceptual and mathematical model were proposed. The first of them describes the characteristic features of healthy and sick patients. The second one quantifies these features. The constructed mathematical model was tested in the classification problem. The Naive Bayes classifier was used as a classifier. As a result of computational experiments, it was shown that for 500 iterations the classifier made a mistake on only 1 sick patient and 5 healthy ones. Thus, the effectiveness of the method of microwave radiothermometry in the task of examining patients with disordered consciousness was shown.

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“…To determine the temperature of internal human tissues, it is necessary to accept the energy of thermal radiation in the microwave range. An overview of the use of microwave radiometry in medicine is presented in [1]. Because of the small values of noise signals taken from a biological object, it is very important to protect against various  Corresponding author: ra3bu@yandex.ru , electromagnetic signals, because the level of interference can be so large that it is difficult to assess the background of their informative signal.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of miniature antennas applicators of microwave radiometry for diagnostics of the functional state of the brain

et al. 2019

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This paper describes the use of Finite Difference Time Domain technique of numerical modeling for development and simulation symmetrical dipole with triangular shoulders placed in a cylindrical housing and a spiral antenna placed in a cylindrical housing for use in microwave radiometry. The new sensors have been tested and validated on different phantoms and biological tissues. Results suggest sufficient characteristics of broadband antennas for potential use in brain functional diagnostics.

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Research of a microwave radiometer for monitoring of internal temperature of biological tissues

Cited by 10 publications

References 32 publications

Portable microwave radiometer for wearable devices

Portable microwave radiometer for wearable devices

Analysis of Brain Thermometric Data Obtained by Microwave Radiothermometry

Numerical simulation of miniature antennas applicators of microwave radiometry for diagnostics of the functional state of the brain

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