| Project/Area Number |
23791451
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Radiation science
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| Research Institution | Teikyo University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
KOBAYASHI Takenori 帝京大学, 医療技術学部, 教授 (10459365)
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| Project Period (FY) |
2011 – 2012
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| Project Status |
Completed (Fiscal Year 2012)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Keywords | 逆問題 / エネルギースペクトル推定 / PDD / リニアック / エネルギースペクトル / スペクトロスコピー |
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| Research Abstract |
The energy spectrum of a clinical photon beam constitutes the most upstream information and is critical in dose distribution. However, the technical difficulty of photon counting has hampered attempts to determine this energy spectrum. In this paper , we present a scheme that infers the X-ray energy spectrum of a linear particle accelerator on the basis of the percentage depth dose (PDD) in an ion chamber.We assumed a linear relationship between the clinical photon beam spectrum and the PDD of the beam. The photon spectrum was then estimated as a solution of maximum a posteriori. The PDD of 4-MV X-rays was measured using an ion chamber and a three-dimensional water phantom in Teikyo University Hospital.Our inference method proved to be effective and powerful in estimating the X-ray energy spectrum. The estimated spectrum closely matched the spectrum modeled in the commercial treatment planning system. Although our method is tested only on a single case, the method is validated by its successful output.
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