• 研究課題をさがす
  • 研究者をさがす
  • KAKENの使い方
  1. 課題ページに戻る

2016 年度 実施状況報告書

Investigation of spatial resolution improvement by use of mouth-insert detector in the helmet PET

研究課題

研究課題/領域番号 16K19241
研究機関国立研究開発法人量子科学技術研究開発機構

研究代表者

Ahmed Abdella  国立研究開発法人量子科学技術研究開発機構, 放射線医学総合研究所 計測・線量評価部, 博士研究員(任常) (30749932)

研究期間 (年度) 2016-04-01 – 2018-03-31
キーワードPET / radiation detector / image reconstruction
研究実績の概要

The dominant factor that limits the intrinsic spatial resolution of a PET system is the size of the crystal elements in the detector. To increase the sensitivity and achieve high spatial resolution, it is essential to use advanced depth-of-interaction (DOI) detectors and arrange them close to the subject. The DOI detectors help to maintain high spatial resolution by mitigating the parallax error caused by the thickness of the scintillator at the peripheral regions in the field-of-view. As an optimal geometry for a brain PET scanner with high sensitivity and high spatial resolution, we proposed and developed the helmet-chin PET using 54 4-layered DOI detectors consisting of 16×16×4 array of GSOZ scintillator crystals with dimensions of 2.8×2.8×7.5 mm3. All the detectors used in the helmet-chin PET had the same spatial resolution. In this study, we conducted a feasibility simulation of a new add-on detector arrangement for the helmet PET by replacing the chin detector with a segmented crystal cube, having high spatial resolution in all directions, which can be placed inside the mouth. The crystal cube (which we call the mouth-insert detector) has 20×20×20 LYSO crystal segments with dimensions of 1×1×1 mm3. Thus, the scanner is formed by the combination of the helmet and mouth-insert detectors, and is referred to as the helmet-mouth-insert PET. The results show that the sensitivity of the helmet-mouth-insert PET had a comparable sensitivity and an improved spatial resolution near the center of the hemisphere compared to those of the helmet chin PET.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

Simulation study was completed as scheduled.

今後の研究の推進方策

H29 plan will have to be changed (shortened) due to the personnel change of the principal investigator, who will leave NIRS for ANSTO (in Australia) by the end of April 2017.

  • 研究成果

    (8件)

すべて 2017 2016 その他

すべて 雑誌論文 (3件) (うち査読あり 3件、 謝辞記載あり 2件) 学会発表 (4件) (うち国際学会 3件) 備考 (1件)

  • [雑誌論文] Investigation of the optimal detector arrangement for the helmet-chin PET; A simulation study2017

    • 著者名/発表者名
      Abdella M. Ahmed, Hideaki Tashima, Eiji Yoshida, Taiga Yamaya
    • 雑誌名

      Nuclear Instruments and Methods in Physics Research A

      巻: 858 ページ: 96-100

    • DOI

      10.1016/j.nima.2017.03.044

    • 査読あり / 謝辞記載あり
  • [雑誌論文] Simulation study of a D-shape PET scanner for improved sensitivity and reduced cost in whole-body imaging2017

    • 著者名/発表者名
      Abdella M Ahmed, Hideaki Tashima and Taiga Yamaya
    • 雑誌名

      Physics in Medicine & Biology

      巻: 62 ページ: 4107-4117

    • DOI

      10.1088/1361-6560/aa6853

    • 査読あり
  • [雑誌論文] Simulation study comparing the helmet-chin PET with a cylindrical PET of the same number of detectors2017

    • 著者名/発表者名
      Abdella M Ahmed, Hideaki Tashima, Eiji Yoshida, Fumihiko Nishikido and Taiga Yamaya
    • 雑誌名

      Physics in Medicine & Biology

      巻: 62 ページ: 4541-4550

    • DOI

      10.1088/1361-6560/aa685c

    • 査読あり / 謝辞記載あり
  • [学会発表] Imaging simulation of a D-shape PET scanner for improved sensitivity and reduced cost in a whole-body imaging2017

    • 著者名/発表者名
      Abdella M. Ahmed, Hideaki Tashima, Taiga Yamaya
    • 学会等名
      International Forum on Medical Imaging in Asia (IFMIA) 2017
    • 発表場所
      てんぶす那覇(沖縄県那覇市)
    • 年月日
      2017-01-20 – 2017-01-20
    • 国際学会
  • [学会発表] Detector size and geometry optimization for the helmet-chin PET2016

    • 著者名/発表者名
      Abdella M. Ahmed, Hideaki Tashima, Eiji Yoshida, Taiga Yamaya
    • 学会等名
      2016 IEEE Nuclear Science Symposium and Medical Imaging Conference
    • 発表場所
      Strasbourg(France)
    • 年月日
      2016-11-04 – 2016-11-04
    • 国際学会
  • [学会発表] The “bed-PET”: a proposed geometry for a highly sensitive and affordable whole body PET scanner2016

    • 著者名/発表者名
      Abdella M. Ahmed, Hideaki Tashima, Eiji Yoshida, Taiga Yamaya
    • 学会等名
      2016 IEEE Nuclear Science Symposium and Medical Imaging Conference
    • 発表場所
      Strasbourg(France)
    • 年月日
      2016-11-04 – 2016-11-04
    • 国際学会
  • [学会発表] Feasibility study of a pixilated mouth-insert detector in the helmet PET2016

    • 著者名/発表者名
      Abdella M. Ahmed, Hideaki Tashima, Eiji Yoshida, Taiga Yamaya
    • 学会等名
      第111回日本医学物理学会学術大会
    • 発表場所
      パシフィコ横浜(神奈川県横浜市)
    • 年月日
      2016-04-16 – 2016-04-16
  • [備考] 次世代PET研究報告書2016

    • URL

      http://www.nirs.qst.go.jp/usr/medical-imaging/ja/study/pdf/QST_R_4.pdf

URL: 

公開日: 2018-01-16  

サービス概要 検索マニュアル よくある質問 お知らせ 利用規程 科研費による研究の帰属

Powered by NII kakenhi