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1993 Fiscal Year Final Research Report Summary

Image Formation of Moisture and Temperature in a Living Body by Microwave Computed Tomography

Research Project

Project/Area Number 04452297
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 農業機械
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

KATO Koro  Kyoto University, Agriculture, Associate Professor, 農学部, 助教授 (70026566)

Co-Investigator(Kenkyū-buntansha) TORII Kiyoshi  Kyoto University, Agriculture, Instructor, 農学部, 講師 (40026563)
Project Period (FY) 1992 – 1993
KeywordsMicrowave CT / Temperature distribution / Mllti-frequency / Time domain gate / Inverse Fourier transform / Moisture distribution / Multipass / TDR
Research Abstract

Image formation of temperature and moisture distribution in living body was studied using multi-frequency microwave transmission CT and TDR.
1. We constructed a simple CT system for agricultural products using a microwave network analyzer and a personal computer. To eliminate the effect of multipath propagation, the system measured the frequency response, converted the data to the time domain and set the time gate corresponding to the direct path between 2 antennas. The gated response was transformed back to the frequency domain, and direct path response was obtained. Measured data at any frequency (1GHz-3GHz) could be selected or combined for projection data.
2. As a result of the image reconstruction by similar same method of X ray CT, the images which included the temperature and structure informations were obtained. The temperature image at a each frequency was obtained from the experiment of thermo-phantom using a water bottle, but the structural image was much stronger than the temperature image in the case of vegetable having voids between cells.
3. We noticed that the temperature coefficients of attenuation constant of water differ largely with frequencies ; thus, the method of extracting the temperature distribution from the image subtraction between the images obtainedat different frequencies, was proposed and experimented with. It became clear that the influence of the phantom wall and that of vegetable structure decreased and the temperature image improved using this method. The image of the thermo-phantom was also obtainted from phase constants.
4. The measurement of moisture disribution in grain layrs using time-domain reflectometry (TDR) was attempted, and it became clear that the moisture distribution of the thick grain layrs in silo or big dryer can be measured by TDR.

  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 加藤宏郎: "生体組織のインピーダンス特性と新しいモデル" 農業機械学会アクテイ21プロジェクトPHYBAS研究報告 農産物とバイオモデリング. 第1集. 19-20 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 加藤宏郎,鳥井清司: "多周波マイクロ波による非破壊温度計測と映像化" 第53回農業機械学会年次大会講演要旨. 53 (末定). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 加藤宏郎: "直達時間ゲートを設けたマイクロ波CTによる果実内水分・空洞分布の画像化" 平成5年度農業施設学会大会講演要旨. 9-10 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 池田善郎,加藤宏郎,田坂英樹: "マイクロ波TDRによる穀物層の水分分布測定" 農業機械学会関西支部報. 第75号(投稿中). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kato, K.: "Impedance characteristics and new electrical model of celluar tissue (in Japanese)." Research Report I Physical Properties and Biomodeling for Applications in Agroproduction Systems. 19-21 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kato, K.: "Nondestructive measurement and image formation of temperature by multi-frequency microwave transmission (in Japanese)" Proceedings of 53th Meeting, JSAM. (in print). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ikeda, Y.: "Measurement of moisture distribution in grain layrs by TDR (in Japanese)" Knsai Branch Report of JSAM,p -. (in print). (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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