A study on backscatter radiation from dental alloys and a protective device during radiotherapy using a three-dimensional dose distribution analysis system
| Project/Area Number |
24592830
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Pathobiological dentistry/Dental radiology
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| Research Institution | Niigata University |
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Principal Investigator |
KATSURA Kouji 新潟大学, 医歯学総合病院, 講師 (30283021)
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| Co-Investigator(Kenkyū-buntansha) |
青山 英史 新潟大学, 医歯学系, 教授 (80360915)
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| Research Collaborator |
KIMURA Syuhei
UTSUNOMIYA Satoru
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| Project Period (FY) |
2012-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 放射線治療 / 歯科用合金 / 後方散乱線 / 口腔粘膜炎 / 予防 / 散乱線 / 有害事象予防 / がん治療 / 線量分布 / 放射線粘膜炎 / デンタルディバイス / 頭頸部放射線治療 / スペーサー / 増悪緩和 / Spacer / Radiation mucositis / Alliviation |
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| Outline of Final Research Achievements |
A dental alloy (DA) in the radiation field can cause severe oral mucositis and uncertain dose distribution due to the scattering and absorption of radiation. A spacer is thought to increase the accuracy and safety of radiotherapy. But, the effects of them on dose distribution have not been clarified. This study was conducted to identify the change of dose distribution caused by backscatter radiation from DAs and the optimal material and thicknesses of a spacer. This study showed that the dose enhancement caused by back and lateral scatter radiation from DA disappears at distances >= 6 mm and >= 3 mm, respectively. These dose enhancements strongly depended on both an atomic number and a physical density of DA, and the estimated equation was 0.077√atomic number + 0.79. Additionally, the optimal material and thickness of spacer should have a lower atomic number and physical density and the thickness of >= 6 mm each to prevent severe mucositis caused by backscatter radiation from DAs.
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Report
(6 results)
Research Products
(42 results)
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[Journal Article] A study on a dental device for the prevention of mucosal dose enhancement caused by backscatter radiation from dental alloy during external beam radiotherap2016
Author(s)
Katsura K, Utsunomiya S, Abe E, Sakai H, Kushima N, Tanabe S, Yamada T, Hayakawa T, Yamanoi Y, Kimura S, Wada S, Aoyama H, Hayashi T
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Journal Title
J Radiat Res
Volume: 57
Issue: 6
Pages: 709-713
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] Monte Carlo calculations to establish a simple relation of backscatter dose enhancement around high-Z dental alloy to its atomic number2016
Author(s)
Utsunomiya S, Kushima N, Katsura K, Tanabe S, Hayakawa T, Yamada K, Sakai H, Takahashi H, Abe E, Wada S, Aoyama H
Organizer
58th AAPM Annual Meeting & Exhibition
Place of Presentation
Washington DC （USA)
Year and Date
2016-07-31
Related Report
Int'l Joint Research
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[Presentation] A study on the changes in dose distribution caused by backscatter radiation from dental alloys in external beam radiotherapy2015
Author(s)
Katsura K, Utsunomiya S, Tanabe S, Abe E, Sakai H, Yamada T, Kushima N, Hayakawa T, Wada S, Aoyama H, Soga M, Hayashi T
Organizer
The 28th Annual Meeting of the Japanese Society for Radiation Oncology
Place of Presentation
Beisia Culture Hall (Gunma Maebashi City)
Year and Date
2015-11-19
Related Report
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[Presentation] がん治療と歯科医療2014
Author(s)
勝良剛詞
Organizer
群馬県歯科医師会新潟大学歯学部同窓会学術講演会
Place of Presentation
渋川市（ホテル木暮）
Year and Date
2014-09-06
Related Report
Invited
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