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Demonstration of translated X-ray CT using reconstruction algorithm based on mathematical optimization method

Research Project

Project/Area Number 19K15476
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 31010:Nuclear engineering-related
Research InstitutionThe University of Tokyo

Principal Investigator

Mitsuya Yuki  東京大学, 大学院工学系研究科(工学部), 助教 (70784825)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsCT / 圧縮センシング / 非破壊検査 / 最適化数学 / X線CT / 直線軌道投影 / 再構成アルゴリズム / 直線軌道CT
Outline of Research at the Start

大型構造物のX線非破壊検査においては、従来のような回転投影によるCTは適用が難しいため、直線的な投影軌道からCT画像を再構成することができれば望ましい。このような技術は、産業や公益面で幅広く大きなインパクトがある。本研究では、直線軌道CTの画像再構成手法を、圧縮センシングと呼ばれる最適化数学の理論に基づいて開発する。開発した再構成手法を用いて数値計算による実証を行い、また小さなシステムを開発し実験を行う。以上により、将来的な大型構造物の非破壊検査への展開に先立つような基礎技術を確立することを目指す。

Outline of Final Research Achievements

In this study, a method for reconstructing CT results projected from a translational trajectory was investigated. Linear orbit projection uses the spread angle of the X-ray source to obtain a parallax image. However, in this case, the angular information is insufficient compared to the conventional rotational orbit projection. Therefore, the conventional reconstruction algorithm cannot provide a perfect reconstruction result. In this study, we demonstrated translational CT using the reconstruction algorithm of compressed sensing-based CT. In addition to total variation regularization, we used a new concept of directional difference regularization method, and constructed a reconstruction algorithm. An experimental system was actually constructed and CT demonstration was successfully performed.

Academic Significance and Societal Importance of the Research Achievements

回転軌道での撮像ではなく、直線的な軌道での投影からCTを行うことができれば、大型構造物に対しても断層撮像を行うことができるため、望ましい。この直線軌道CTでは、コーンビームやファンビームのX線が発散する角度をうまく利用して、視差のあるX線画像を取得して、そこから断面画像の再構成を行うというコンセプトである。直線軌道CTは広範囲な大型構造物、移動が困難な物体に対しても適用できると考えられるため、新しいCT技術として産業や公益面で大きなインパクトがあると考えられる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (3 results)

All 2021 2020 2019

All Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Presentation] X-ray CT using translational trajectory and its reconstruction based on compressed sensing2021

    • Author(s)
      Yuki Mitsuya, Hiroyuki Takahashi
    • Organizer
      2021 IEEE Nuclear Science Symposium and Medical Imaging Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study on reconstruction accuracy of compressed sensing-based algorithm for translational trajectory CT2020

    • Author(s)
      Yuki Mitsuya, Mitsuru Uesaka, Hiroyuki Takahashi
    • Organizer
      2020 IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Compressed sensing-based reconstruction for computed tomography with translational trajectory2019

    • Author(s)
      Yuki Mitsuya, Mitsuru Uesaka, Hiroyuki Takahashi
    • Organizer
      2019 IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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