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SIZE-SPECIFIC DOSE ESTIMATES IN FETAL COMPUTED TOMOGRAPHY

Research Project

Project/Area Number 19K17152
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 52040:Radiological sciences-related
Research InstitutionFujita Health University

Principal Investigator

Kobayashi Masanao  藤田医科大学, 保健学研究科, 准教授 (80720979)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
KeywordsCT / 被ばく / 放射線 / 放射線被ばく / 胎児 / CTDI / SSDE / Organ Dose Modulation
Outline of Research at the Start

胎児CT検査の実施には2人の個人を考慮しなければなりません.母体となる妊婦に対しては,本人に直接的な利益なく放射線を受けることになりますが被ばく線量を評価する方法は確立しています.一方,胎児に対しては,診断目的で放射線を受けることになりますが,その被ばく線量を評価する方法は確立していません.将来的な放射線障害を危惧する両親の不安を解消するためにも胎児の被ばく線量を評価する方法を確立します.

Outline of Final Research Achievements

During fetal computed tomography (CT) imaging, because of differences in the pregnancy period and scanning conditions, different doses of radiation are absorbed by the fetus. We propose a correction coefficient for determining the fetal size-specific dose estimate (SSDE) from the CT dose index (CTDI) displayed on the console at tube voltages of 80,100,120,135 kVp. The CTDIs corresponding to pregnant women and fetuses were evaluated using a Monte Carlo (MC) simulation, and the ratio of these CTDIs was defined as the Fetus-factor. When the effective diameter of a fetus was approximately 10 cm, the Fetus-factor was 1.0. The estimated pregnant SSDE was multiplied by the Fetus-factor to estimate the fetal SSDE, which was compared with the fetal dose obtained by the MC simulation of the image of the fetal CT examination. The fetal dose could be estimated with an error of 31.5% in fetal examinations conducted using helical CT.

Academic Significance and Societal Importance of the Research Achievements

胎児CT検査の実施には2人の個人を考慮しなければなりません.母体となる妊婦に対しては,本人に直接的な利益なく放射線を受けることになりますが被ばく線量を評価する方法は確立しています.一方,胎児に対しては,診断目的で放射線を受けることになりますが,その被ばく線量を評価する方法は確立していませ
ん.将来的な放射線障害を危惧する両親の不安を解消するためにも胎児の被ばく線量を評価する方法を新しく確立しました。

Report

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

    (2 results)

All 2022 2020

All Journal Article (2 results) (of which Peer Reviewed: 2 results)

  • [Journal Article] Size-Specific Dose Estimates in Fetal Computed Tomography2022

    • Author(s)
      Kobayashi Masanao、Nishihara Yusei、Haba Tomonobu、Matsunaga Yuta、Minami Kazuyuki、Asada Yasuki
    • Journal Title

      Radiation Protection Dosimetry

      Volume: ー Issue: 6 Pages: 1-10

    • DOI

      10.1093/rpd/ncac045

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Evaluation of exposure dose in fetal computed tomography using organ-effective modulation2020

    • Author(s)
      Kobayashi Masanao、Haba Tomonobu、Suzuki Sayaka、Nishihara Yusei、Asada Yasuki、Minami Kazuyuki
    • Journal Title

      Physical and Engineering Sciences in Medicine

      Volume: 43 Issue: 4 Pages: 1195-1206

    • DOI

      10.1007/s13246-020-00921-z

    • Related Report
      2020 Research-status Report
    • Peer Reviewed

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

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