Development of a miniature microwave radiothermograph for monitoring the internal brain temperature

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.134130

Keywords:

microwave radiothermometry, temperature monitoring, printed antenna, medical radiothermograph, radiobrightness temperature, medical robotics

Abstract

To improve efficiency of non-invasive monitoring of the internal brain temperature, a small-size single-channel microwave radiothermograph consisting of a miniature radiometer and a radiometric sensor based on a printed antenna was developed. Such solution is necessary to provide physicians with a system of non-invasive monitoring of diagnosis and treatment processes. Mathematical modeling and experimental verification of the technical solutions obtained are described in this paper. A miniature radiothermometer was developed. It is a balance modulation radiometer designed on the basis of the R.H. Dicke’s circuit with two loads. Taking into account the requirements of miniaturization, a radiometric sensor was developed by means of numerical simulation. As a result of calculations, optimum antenna dimensions were determined (the total size: ø30 mm, the size of the foil flane substrate: ø23 mm, dimensions of the emitter slot: 16 mm×2 mm). According to the mathematical modeling, the depth of detection of thermal anomalies was not less than 20 mm for the printed antenna which is practically the same as for the waveguide antenna successfully used at present in brain radiothermometry.

The standing wave coefficient was determined for various head regions: frontal, temporal, parietal, occipital and the transient between the occipital and parietal regions. Experimental tests of the radiothermograph on water phantoms and biological objects have been carried out. A very good coincidence between the data of numerical simulation and the physical SWR experiment in a range of 1.04–1.8 was obtained. As a result of the study, it has been found that the radiothermograph with a printed slot antenna enabled measurement of internal brain temperature with an acceptable accuracy (±0.2 °C). This will ensure control of craniocerebral hypothermia in patients with brain stroke and allow doctors to promptly change the hypothermia tactics. Small size of the created unit will make it possible to combine it with medical robotic systems to improve treatment effectiveness.

Author Biographies

Mikhail Sedankin, FGBU "GNIIIT RT" of the Ministry of Defense of the Russian Federation Seregina str., 5, Moscow, Russia, 125167

PhD, Researcher

Department of collection, processing and analysis of test results of robotic complexes

Daria Chupina, Bauman Moscow State Technical University 2-ya Baumanskaya str., 5, Moscow, Russia, 105005

Department of Medical and technical information technologies

Sergey Vesnin, LLC "RTM Diagnostics» Bol'shaya Pochtovaya str., 55/59, Moscow, Russia, 105082

PhD, Chief Designer

Igor Nelin, Moscow Aviation Institute Volokolamskoe highway, 4, Moscow, Russia, 125993

PhD, Assistant professor

Department of Radiolocation, radio navigation and on-board radio electronic equipment

Victor Skuratov, VNIIRT Bol'shaya Pochtovaya, str., 22, Moscow, Russia, 105082

Engineer, Researcher

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Published

2018-06-18

How to Cite

Sedankin, M., Chupina, D., Vesnin, S., Nelin, I., & Skuratov, V. (2018). Development of a miniature microwave radiothermograph for monitoring the internal brain temperature. Eastern-European Journal of Enterprise Technologies, 3(5 (93), 26–36. https://doi.org/10.15587/1729-4061.2018.134130

Issue

Vol. 3 No. 5 (93) (2018): Applied physics

Section

Applied physics

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Copyright (c) 2018 Mikhail Sedankin, Daria Chupina, Sergey Vesnin, Igor Nelin, Victor Skuratov

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