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2015 Fiscal Year Annual Research Report

ドップラー補償光学型および偏光感受型光干渉断層計による三次元光バイオプシーの開発

Research Project

Project/Area Number 25293353
Research InstitutionUniversity of Tsukuba

Principal Investigator

大鹿 哲郎  筑波大学, 医学医療系, 教授 (90194133)

Co-Investigator(Kenkyū-buntansha) 平岡 孝浩  筑波大学, 医学医療系, 講師 (30359575)
加治 優一  筑波大学, 医学医療系, 准教授 (50361332)
Project Period (FY) 2013-04-01 – 2017-03-31
Keywords光干渉断層計 / OCT / 複屈折 / 偏光感受性 / 偏光位相差
Outline of Annual Research Achievements

次世代光干渉断層計(Optical Coherence Tomography, OCT)の測定を種々の眼疾患患者において行い,測定の精度及び適合性を検討するとともに,病態の新たな解明を行った.偏光感受型OCTで円錐角膜の初期から進行例までを測定し,円錐角膜眼においては偏光位相差に偏りが見られるほか,シグナルが上昇していること,Amsler & Muckenhirn分類と相関して角膜実質の複屈折が増加していくことを明らかにした.片眼性の円錐角膜患者の正常な僚眼で,細隙灯顕微鏡検査所見でもトポグラフィーでも変化が見られないものをforme fruste keratoconusというが,その状態においてもforme fruste keratoconusにおいても偏光位相差が明らかに変化していた例を見出し,角膜形状の変化より早期に角膜実質コラーゲンに質的変化が生じている可能性を示した.緑内障眼における濾過手術の術後経過を観察し,濾過胞内の偏光位相差と,これまで前眼部OCTで計測されてきたパラメータ群(濾過胞内部の水隙の大きさ,壁の厚さ,過胞内の小水胞の数,強膜フラップ開口部,強膜フラップ下の水隙の有無,低吸収領域の体積など)が,濾過胞機能すなわち眼圧とどのように関連するか検討した.多変量解析を用いて解析したところ,濾過胞内の偏光位相差の変化が濾過胞機能と最も強く関連し,次いで患者年齢,術後期間,濾過胞内部の水隙の大きさ,壁の厚さ,低吸収領域の面積などが有意な関連を示した.これまで濾過胞の高さや内部の水隙などが機能的な濾過胞の因子として注目されてきたが,以前は測定することができなかった濾過胞の内部線維化という新しい質的性状の変化を偏光OCTで評価でき,さらにその内部線維化が濾過胞の機能を決定する重要な因子であることを示すことが出来た.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

評価装置を外来に設置し,順調に測定を重ねている.正常眼のみならず,病態眼,手術後眼などのデータも着々と取得しており,データベース構築が進んでいる.

Strategy for Future Research Activity

当初の方針通り研究を遂行していく予定である.

Causes of Carryover

ソフトウエアの購入計画に一部変更があったため.

Expenditure Plan for Carryover Budget

次年度研究費とまとめて予算を執行する予定.

  • Research Products

    (11 results)

All 2016 2015

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Acknowledgement Compliant: 2 results) Presentation (6 results) (of which Int'l Joint Research: 6 results,  Invited: 2 results)

  • [Journal Article] Repeatability of corneal phase retardation measurements by polarization-sensitive optical coherence tomography2015

    • Author(s)
      Fukuda S, Kishino G, Hoshi S, Beheregaray S, Ueno Y, Fukuda M, Kasaragod D, Yasuno Y, Oshika T
    • Journal Title

      Invest Ophthalmol Vis Sci

      Volume: 56 Pages: 3196-3201

    • DOI

      10.1167/iovs.14-16327

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Corneal thickness profile and posterior corneal astigmatism in normal corneas2015

    • Author(s)
      Ueno Y, Hiraoka T, Miyazaki M, Ito M, Oshika T
    • Journal Title

      Ophthalmology

      Volume: 122 Pages: 1072-1078

    • DOI

      10.1016/j.ophtha.2015.01.021

    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Verification of the lack of correlation between age and longitudinal chromatic aberrations of the human eye from the visible to the infrared2015

    • Author(s)
      Nakajima M, Hiraoka T, Hirohara Y, Oshika T, Mihashi T
    • Journal Title

      Biomed Opt Express

      Volume: 6 Pages: 2676-2694

    • DOI

      10.1364/BOE.6.002676. eCollection 2015 Jul 1

    • Peer Reviewed
  • [Journal Article] Influence of ocular wavefront aberrations on axial length elongation in myopic children treated with overnight orthokeratology2015

    • Author(s)
      Hiraoka T, Kakita T, Okamoto F, Oshika T
    • Journal Title

      Ophthalmology

      Volume: 122 Pages: 93-100

    • DOI

      10.1016/j.ophtha.2014.07.042

    • Peer Reviewed
  • [Journal Article] Multimodal and multiplex spectral imaging of rat cornea ex vivo using a white-light laser source.2015

    • Author(s)
      Segawa H, Kaji Y, Leproux P, Couderc V, Ozawa T, Oshika T, Kano H
    • Journal Title

      J Biophotonics

      Volume: 8 Pages: 2107-2114

    • DOI

      10.1002/jbio.201400059

    • Peer Reviewed
  • [Presentation] Development of a comprehensive evaluation system for anterior segment structure and function2016

    • Author(s)
      Oshika T
    • Organizer
      The 31th Asia-Pacific Academy of Ophthalmology Congress
    • Place of Presentation
      Taipei, Taiwan
    • Year and Date
      2016-03-24 – 2016-03-27
    • Int'l Joint Research / Invited
  • [Presentation] New anterior segment OCT using polarization sensitive technology2015

    • Author(s)
      Oshika T
    • Organizer
      The Annual Meeting of Guangdong Ophthalmological Society held in conjunction with the 11th International Symposium of Ophthalmology
    • Place of Presentation
      Guangdong, China
    • Year and Date
      2015-10-30 – 2015-11-02
    • Int'l Joint Research / Invited
  • [Presentation] Maximum-a-posteriori birefringence estimator for polarization sensitive optical coherence tomography2015

    • Author(s)
      Kasaragod D, Sugiyama S, Ikuno Y, Caneiro DA, Yamanari M, Fukuda S, Oshika T, Hong YJ, Li1 E, Makita S, Miura M, Yasuno1 Y
    • Organizer
      Optics & Photonics Japan 2015
    • Place of Presentation
      Tokyo, Japan
    • Year and Date
      2015-10-28 – 2015-10-30
    • Int'l Joint Research
  • [Presentation] Quantitative evaluation of refractive components of posterior corneal surface using Fourier analysis: an attempt to determine a normal range of values for each Fourier index.2015

    • Author(s)
      Inoue Y, Ueno Y, Hiraoka T, Okamoto F, Oshika T
    • Organizer
      Association for Research in Vision and Ophthalmology
    • Place of Presentation
      Denver, Colorado, USA
    • Year and Date
      2015-05-03 – 2015-05-07
    • Int'l Joint Research
  • [Presentation] Ultrasound biomicroscopic analysis of normal human ciliary body2015

    • Author(s)
      Terauchi A, Okamoto Y, Okamoto F, Nakano S, Oshika T
    • Organizer
      Association for Research in Vision and Ophthalmology
    • Place of Presentation
      Denver, Colorado, USA
    • Year and Date
      2015-05-03 – 2015-05-07
    • Int'l Joint Research
  • [Presentation] Bleb analysis of glaucoma filtration surgery using quantitative birefringence imaging of the anterior eye2015

    • Author(s)
      Kasaragod D, Fukuda S, Ueno Y, Oshika T, Yasuno Y
    • Organizer
      Association for Research in Vision and Ophthalmology
    • Place of Presentation
      Denver, Colorado, USA
    • Year and Date
      2015-05-03 – 2015-05-07
    • Int'l Joint Research

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Published: 2017-01-06  

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