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Non-Destructive Three-Dimensional Evaluation Method for Monitoring Polyethylene Glycol Impregnation Progress in Waterlogged Wood Using Clinical MRI and CT

Research Project

Project/Area Number 21K00992
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 03060:Cultural assets study-related
Research InstitutionKyorin University

Principal Investigator

Mori Mika  杏林大学, 保健学部, 講師 (90737165)

Co-Investigator(Kenkyū-buntansha) 久原 重英  杏林大学, 保健学部, 非常勤講師 (60781234)
小林 邦典  杏林大学, 保健学部, 非常勤講師 (90723867)
Project Period (FY) 2021-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords木質文化財 / CT / MRI / Polyethylene glycol
Outline of Research at the Start

遺跡から出土した木製遺物には大量の水が含まれており,極めて脆弱である。これらのうち文化財として価値のある遺物は保存処理が施されるが、Polyethylene glycol (PEG)は保護剤として用いられることの多い材料のひとつである。木製遺物は木材に含まれる水をPEGへと置き換えるために,状態にあわせてPEG分子量やPEG水溶液が選択されて含浸処理が施されるが、木材への含浸状態の推定は技術者の経験によるところが大きく,また定量的な方法では計測の際に破壊的なものになる可能性がある。
そこで本研究では人体用MR装置およびCT装置を用いたPEG含浸の非破壊経時的観察と3次元可視化を目的とする。

Outline of Final Research Achievements

This study aims to develop a non-destructive, 3-dimensional visualization method for polyethylene glycol (PEG; HO(C2H4O)n-H) impregnation in waterlogged wooden artifacts. PEG is commonly used in preservation treatments to stabilize deteriorated wood. Using clinical MRI with an ultra-short echo time (UTE), we successfully acquired 3D images showing PEG distribution. However, this method requires long scan times and is sensitive to temperature changes during imaging.
To address these issues, we also examined dual-energy computed tomography (DECT), which enables faster image acquisition. CT image data were analyzed using Excel and ImageJ to color-map PEG-impregnated areas. The visualized distribution correlated with time-dependent changes in the sample’s mass, indicating successful monitoring of impregnation progress.

Academic Significance and Societal Importance of the Research Achievements

臨床MRI(UTE)とDECTを用いた木製遺物におけるPEG含浸三次元可視化法は、非破壊的かつ客観的評価が可能である。提案手法は考古学分野において、より効率的な保存プロセスを支援可能であることが示唆された。これは考古学・文化財科学を発展させる上で大きな意義がある。

Report

(5 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (2 results)

All 2025 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Nondestructive visualization of polyethylene glycol impregnation in wood using ultrashort echo time 3D imaging2021

    • Author(s)
      Mika Mori, Shigehide Kuhara, Kuninori Kobayashi, Sinya Suzuki
    • Journal Title

      Journal of Cultural Heritage

      Volume: 50 Pages: 43-48

    • DOI

      10.1016/j.culher.2021.05.008

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Application of Dual-energy CT to Archaeology; Three-dimensional imaging of polyethylene glycol impregnation in archaeological wood2025

    • Author(s)
      Mika Mori
    • Organizer
      European Society of Radiology
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2026-01-16  

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