2023 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 |
宋 航 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, a new method named small distance increment method was developed to estimate the complex permittivity of the material. In the proposed method, the transmitter and receiver were formed as the monostatic radar, which is facing towards the material under test. During the measurement, the distance between radar and material changes with small increments and the signals are recorded at each position. A mathematical model is formulated to depict the relationship among the complex permittivity, distance increment, and measured signals. By fitting the model, the complex permittivity of material was successfully estimated. Furthermore, an imaging system was developed to measure the distribution of the reflectivity of a designated region. The propagation of the wave for imaging was also simulated by proposing a hybrid approach. This hybrid approach is composed by geometrical optics and physical optics methods. The transmission of the wave through shielding material is calculated by geometrical optics and the reflection from the target material is calculated by physical optics. By comparing the measurement and simulation, the good agreement was achieved. Through measuring the reflectivity distribution, the distribution complex permittivity in the region can be estimated.
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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
A new method was proposed to conduct the complex permittivity estimation, and an imaging system was developed which can demonstrate the reflectivity distribution of a certain area. The reflectivity is related to the complex permittivity which is able to be utilized for calculating the conductivity. These achievements can promote the development of the fused optical and microwave system for conductivity measurement.
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| Strategy for Future Research Activity |
For the next year, the fused optical and microwave system will be developed to measure the conductivity. The relationship between the optical image and the conductivity will be further studied and clarified.
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| Causes of Carryover |
The selection of the type of camera and quantum sensor take more time than expected since they are very expensive. Therefore, the purchase will be completed in the next fiscal year to have more time to select carefully
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[Journal Article] Cross-Correlation of Confocal Images for Excised Breast Tissues of Total Mastectomy2024
Author(s)
Hang Song, Shinsuke Sasada, Takayuki Kadoya, Koji Arihiro, Morihito Okada, Xia Xiao, Tomomi Ishikawa, Declan O'Loughlin, Jun-ichi Takada, and Takamaro Kikkawa
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Journal Title
IEEE Transactions on Biomedical Engineering
Volume: vol. 71, no. 5
Pages: 1705 - 1716
DOI
Peer Reviewed / Int'l Joint Research
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