• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Analysis of Relationship between Reason for Frequent Pediatric CT Examinations and Brain Tumor Incidence

Research Project

Project/Area Number 18K07765
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52040:Radiological sciences-related
Research InstitutionNippon Bunri University (2021)
Oita University of Nursing and Health Sciences (2018-2020)

Principal Investigator

Kai Michiaki  日本文理大学, 新学部設置準備室, 教授 (10185697)

Co-Investigator(Kenkyū-buntansha) 小野 孝二  東京医療保健大学, 看護学部, 教授 (10611171)
宮嵜 治  国立研究開発法人国立成育医療研究センター, 放射線診療部, 部長 (80278019)
Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsCT検査 / 放射線被ばく / 脳腫瘍 / 検査理由 / 硬膜下血腫 / 放射線線量 / ICD-10 / 水頭症 / 外傷 / 被ばく / 逆因果関係 / 正当化 / CT線量 / 脳腫瘍リスク
Outline of Final Research Achievements

Pediatric CT scans are essential for the diagnosis of disease, but there is no clear indication that there are confounding factors in epidemiologic studies reporting that radiation exposure associated with CT scans increases brain tumor risk. This study analyzes the reasons for the increase in the number of CT examinations by analyzing 15 years of radiology reports and how this affects the suspected brain tumor risk. The trend toward an increase in the number of examinations with surgery identified in this study is significant and may miss confounding factors that underlie surgery. In addition, the number of non-head examinations was found to affect the number of head examinations, suggesting the possibility of confounding by examinations performed because of suspected non-head disease.

Academic Significance and Societal Importance of the Research Achievements

比較的高線量の放射線被ばくががんリスクを増加させることは確立した知見である。近年のCT検査利用の増大を受けて小児被ばくのリスクの懸念を示す疫学調査結果が報告されている。これらの疫学調査の妥当性を検証するためには、CT検査数が増える理由を明らかにし、それがリスクに交絡している可能性を調べること、一方で、検査の必要性からCT検査数増加のリスクとベネフィットを議論していくための基礎情報を提供する研究である。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (7 results)

All 2021 2020 2019 2018

All Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Estimating Organ Doses from Pediatric Cerebral Computed Tomography Using the WAZA-ARI Web-Based Calculator2021

    • Author(s)
      Etani Reo、Yoshitake Takayasu、Kai Michiaki
    • Journal Title

      Journal of Radiation Protection and Research

      Volume: 46 Issue: 1 Pages: 1-7

    • DOI

      10.14407/jrpr.2020.00227

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Clinical indications for the use of computed tomography in children who underwent frequent computed tomography: a near-13-year follow-up retrospective study at a single institution in Japan2020

    • Author(s)
      Yoshitake Takayasu、Ono Koji、Ishiguchi Tsuneo、Maeda Toru、Kai Michiaki
    • Journal Title

      Radiation and Environmental Biophysics

      Volume: 59 Issue: 3 Pages: 407-414

    • DOI

      10.1007/s00411-020-00857-8

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Computed tomography of the head and the risk of brain tumours during childhood and adolescence: results from a case?control study in Japan2020

    • Author(s)
      Kojimahara Noriko、Yoshitake Takayasu、Ono Koji、Kai Michiaki、Bynes Graham、Sch?z Joachim、Cardis Elisabeth、Kesminiene Ausrele
    • Journal Title

      Journal of Radiological Protection

      Volume: 40 Issue: 4 Pages: 1010-1023

    • DOI

      10.1088/1361-6498/abacff

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Evaluation of the lifetime brain/central nervous system cancer risk associated with childhood head CT scanning in Japan.2020

    • Author(s)
      Yuko Kadowaki,Nobuyuki Hamada,Michiaki Kai,Kyoji Furukawa
    • Journal Title

      Int J Cancer.

      Volume: 148 Issue: 10 Pages: 2429-2439

    • DOI

      10.1002/ijc.33436

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Analysis of reasons for the multiple scans of paediatric CT examinations in Japan: What causes the different number of scans in disease with the same ICD code2021

    • Author(s)
      Takayasu Yoshitake, Koji Ono, Masayuki Kitamura, Osamu Miyazaki, Michiaki Kai
    • Organizer
      IRPA15, 15th International Congress of the International Radiation Protection Association
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 複数回のCT検査を受けている小児の検査理由の分析 ー同一ICDコードによる違い2019

    • Author(s)
      吉武貴康,小野孝二,北村正幸,宮嵜 治,甲斐倫明
    • Organizer
      日本放射線安全管理学会第18回学術大会・日本保健物理学会第52回研究発表会合同大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 複数回CT検査を受けている小児の検査理由の分析 -14年間の2病院比較-2018

    • Author(s)
      吉武貴康, 小野孝二, 宮嵜 修, 甲斐倫明
    • Organizer
      日本保健物理学会第51回研究発表会
    • Related Report
      2018 Research-status Report

URL: 

Published: 2018-04-23   Modified: 2023-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi