2022 Fiscal Year Research-status Report
Optical measurement of tissue conductivity in microwave range with cell-level resolution
| Project/Area Number |
22K14299
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
ソウ コウ 東京工業大学, 環境・社会理工学院, 助教 (80907288)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Keywords | Permittivity measurement / Conductivity measurement / Microwave measurement / Millimeter wave |
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| Outline of Annual Research Achievements |
In this year, the technology of estimating the complex permittivity by using the millimeter wave radar was developed. The measurement system was build with the stage, radar module, and the indicator. The position of radar and the material can be adjusted precisely with the stage and indicator. During the measurement, the metal plate was utilized for calibration and then the measurements were conducted several times by changing the distance. Acrylic plate was used to test the performance. The measured complex permittivity showed good agreement with the results in other works. With the developed technology of estimating the dielectric property of materials, the dielectric property distribution can be imaged by moving the object in difference directions. Meanwhile, the penetration loss of the millimeter wave inside the materials was evaluated by using the radar and the corner reflector. It was observed that the millimeter wave attenuates quite fast inside the material. It is expected that when using the millimeter wave as the pump wave to illuminate the material, the energy loss will be higher than that in the microwave range. Therefore, the conductivity of the micro-scale structure in the millimeter wave range is also expected to be estimated. Besides, the technology by using the microwave to noninvasively estimate the hydration status monitoring was proposed.
These achievements have been published as journal/conference papers.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The purpose of this research project is to develop a measurement system which can estimate the conductivity of tissue at micro-level resolution. This project is a combination of optical approach and microwave approach. In this year, the microwave part was concentrated on. The microwave and millimeter wave were studied and the technology was proposed which can estimate the permittivity of material with millimeter wave radar. Also, the loss in materials was evaluated which can provide the foundation to figure out the relationship between energy loss and conductivity. With the better understanding of the behavior of the microwave and millimeter wave in permittivity estimation and attenuation loss, it can facilitate the development of the system which is aimed for. The achievements of the research have been published on conference/journal papers, which shows that the research was progressing smoothly.
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| Strategy for Future Research Activity |
For the next year, the followings will be conducted.
1. The antenna will be designed to generate the microwave for quantum sensing.
2. The optical part of the proposed system will be constructed for measuring the conductivity.
3. The preliminary test will be conducted with phantom materials to evaluate the performance.
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| Causes of Carryover |
Due to the COVID-19 situation, the participation of conferences was reduced. The amount will be used in the next year for conference registration fee/journal publication fee and supporting travel expense.
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