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Dosimetry of Patient Dose and the reduction in radiological diagnosis

Research Project

Project/Area Number 09670935
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Radiation science
Research InstitutionOkayama University

Principal Investigator

NAKAGIRI Yoshitada  Medical School, Okayama University, Associate Professor, 医学部, 助教授 (80207745)

Co-Investigator(Kenkyū-buntansha) SHIBUYA Koichi  Medical School, Okayama University, Assistant, 医学部, 助手 (00253013)
AZUMA Yoshiharu  Medical School, Okayama University, Associate Professor, 医学部, 助教授 (90212505)
SUGITA Katsuhiko  Medical School, Okayama University, Professor, 医学部, 教授 (50033296)
GOTO Sachiko  Medical School, Okayama University, Assistant, 医学部, 助手 (80243517)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1999: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1998: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
Keywordsdosimetry of low energy X-ray / patient dose / X-ray examination / フィルター効果 / 放射線被曝 / X線撮影条件 / 被曝低減 / エックス線計測 / 医用被曝 / 撮影条件
Research Abstract

Surface dose and PDD data were measured to determine the degree of radiological exposure in different organs in patients undergoing an X-ray examination. Through these of these data, the degree of radiological exposure to any particular organ in the body can be estimated. A survey of radiological conditions was conducted at a hospital in Okayama Prefecture to determine the degree of fetal exposure in pregnant women undergoing a plain abdominal X-ray examination. The results demonstrated that the degree of exposure varied greatly from one fetus to the next. Also, based on the mean radiological exposure, it was determined that 164 X-ray examinations would equal the threshold value of the biological tolerance of human fetuses.
Furthermore, plain X-rays were taken from the lateral side of the lumbar region to investigate the effect of bone tissue on fetal exposure. The results revealed that the degree of radiological fetal exposure was affected by the presence of bone tissue, but this effect was negligibly detectable when a fetus was at least 10 cm away from the bone tissue.
In terms of measures to reduce radiological exposure, shifts in PDD were analyzed by attaching an added filter to the outlet to increase total filtration. The results demonstrated that the degree of reduction in radiation dose for deep areas of the body was smaller than that for surface areas, and that the tendency was that the higher X-ray tube voltage or the thinner the filter, the smaller the rate of reduction.
As the results, patient dose in radiological diagnosis was smaller than that in giving rise to the acute biological damages, but radiologists or radiological technologists must cooperate to minimize patient exposure in X-ray examinations.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 中桐義忠,東義晴,丸山敏則他: "腹部単純X線撮影時の被曝線量 ー岡山県下の病院の現況ー"環境制御. 20. 17-21 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 中桐義忠,丸山敏則 後藤佐知子他: "撮影条件からの腹部X線被曝線量の算定 ー岡山県下の現況ー"(社)岡山県放射線技師会会誌. 18. 10-16 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yoshitada Nakagiri, Yoshiharu Azuma, Toshinori Maruyama, Koichi Shibuya, Sachiko Goto, Katsuhiko Sugita, Yasuki Morioka, Shigefumi Kadohisa, Tatsuya Inoue and Yoshio Hiraki: "Patient Dose on the Radiological Diagnosis of Abdomen - The Situation of Patient Dose at Hospitals in Okayama Prefecture -"Environment Research and Control. 20. 17-21 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yoshitada Nakagiri, Toshinori Maruyama, Sachiko Goto, Yoshiharu Azuma, Koichi Shibuya, Tatsuya Inoue, Shigefumi Kadohisa and Yasuki Morioka: "Patient Dose on the Radiological Diagnosis of Abdomen Calcurated with X-ray Exposure - The Situation of Patient Dose at Hospitals in Okayama Prefecture -"Journal of Okayama Association of Radiological Technologists. 18. 10-16 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 中桐義忠,丸山敏則,後藤佐知子他: "撮影条件からの腹部X線被曝線量の算定"(社)岡山県放射線技師会会誌. 第18号. 10-16 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 中桐義忠,丸山敏則,後藤佐知子他: "腰部側面撮影における骨の被曝に対する影響"(社)日本放射線技師会雑誌. (発表予定).

    • Related Report
      1999 Annual Research Report
  • [Publications] 中桐義忠: "腹部単純X線撮影時の被曝線量-岡山県下の病院の現況-" 環境制御. 第20巻. 17-21 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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