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Development of ultra-high-resolution CT with contact geometry

Research Project

Project/Area Number 17K16431
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Radiation science
Research InstitutionKanazawa University

Principal Investigator

Kawashima Hiroki  金沢大学, 保健学系, 助教 (70775577)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
KeywordsX線CT / 高解像度 / 四肢 / コンピュータ断層撮影 / 解像度 / CT / 放射線
Outline of Final Research Achievements

The spatial resolution of a CT system is predominantly determined by the scanner’s geometric design including detector pitch, focal spot size, focus-isocenter distance, and focus-detector distance. Therefore, a conventional CT, which is now clinically available, has a limited resolution. On the other hand, although a micro CT significantly improved the resolution, extension of the scanning time and in-accurate CT number were concerns. In order to improve the spatial resolution and overcome these shortcomings, we developed an ultrahigh-resolution (UHR) CT system constructed by adding a high-resolution CMOS detector with a 0.1-mm pixel pitch to a 16-row multislice CT scanner. This UHR-CT with contact geometry showed superior performance than conventional CT. It is expected that fine anatomical structures of bones and inner ear, which have not been sufficiently visualized by conventional CT scanners, can be clearly visualized by this system.

Academic Significance and Societal Importance of the Research Achievements

CTの高解像化に関する研究発表が報告されているが,高速かつCT値精度を担保しながら人体の微小構造を描出し得る技術開発は無い.本研究は,汎用型CTの利点である大容量のX線出力を活用しつつ,高精細検出器を用いて近接ジオメトリとすることで高解像度化する新たな試みである.撮像範囲が6.8 mmと限定的であるものの,顕著な解像度の向上に成功し,0.2 mm程度の大きさである骨梁構造の描出が可能となった.今後,骨髄レベルでの画像観察により,四肢疾患の新たな画像所見の発見や治療効果を可視化できる可能性があり,臨床応用されることで医療の質の向上に貢献できる.

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report

Research Products

(8 results)

All 2019 2018 2017

All Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (7 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Technical Note: Performance comparison of ultra‐high‐resolution scan modes of two clinical computed tomography systems2019

    • Author(s)
      Kawashima Hiroki、Ichikawa Katsuhiro、Takata Tadanori、Nagata Hiroji、Hoshika Minori、Akagi Noriaki
    • Journal Title

      Medical Physics

      Volume: 47 Pages: 488-497

    • DOI

      10.1002/mp.13949

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Novel Ultrahigh-Resolution CT Using a CMOS Detector Built on a Conventional Multislice CT Scanner's Detector2019

    • Author(s)
      Kawashima H, Ichikawa K, Takata T, Kobayashi S
    • Organizer
      RSNA 2019: 105rd Scientific Assembly and Annual Meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Built-on型検出器による超高解像度CTシステムの性能改善2019

    • Author(s)
      下川蒼永,市川勝弘,川嶋広貴,五十嵐洸太
    • Organizer
      第47回日本放射線技術学会秋季学術大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 新たなコンセプトの超高解像度CTの開発:近接ジオメトリと高精細CMOS検出器2019

    • Author(s)
      川嶋広貴,市川勝弘,高田忠徳,三井渉
    • Organizer
      日本CT技術学会第7回学術大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 四肢用超高解像度CTの実現に向けた実験システムの構築と画質計測2018

    • Author(s)
      谷村優花,市川勝弘,川嶋広貴,名和蓮
    • Organizer
      第46回日本放射線技術学会秋季学術大会
    • Related Report
      2018 Research-status Report
  • [Presentation] System Performance Comparison of Ultra-High-Resolution Scans Using Two Clinically Available Multi-Detector CT Systems2018

    • Author(s)
      Hiroki Kawashima, Katsuhiro Ichikawa, Satoshi Kobayashi, Noriaki Akagi, Hiroji Nagata
    • Organizer
      RSNA2018 104th Scientific assembly and annual meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] A novel reconstruction algorithm for arm-artifact reduction in computed tomography2018

    • Author(s)
      川嶋広貴
    • Organizer
      SPIE 2018
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Arm Artifact Reduction Techniques for Computed Tomographic Images: Has the Problem Been Overcome by Existing Techniques?2017

    • Author(s)
      川嶋広貴
    • Organizer
      RSNA 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2021-02-19  

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