Analytical Design Method of Optimum Ridge Filters for Wobbled and Collimated Proton Beams
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- HIMUKAI Takeshi
- Institute of Applied Physics, University of Tsukuba
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- TAKADA Yoshihisa
- Institute of Applied Physics, University of Tsukuba
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- HOTTA Kenji
- Institute of Applied Physics, University of Tsukuba
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- HARA Yousuke
- Institute of Applied Physics, University of Tsukuba
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- KOMORI Masataka
- National In stitute of Radiological Sciences
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- KANAI Tatsuaki
- National In stitute of Radiological Sciences
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- KOHNO Ryosuke
- National Cancere Cnter Hospital East
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抄録
A novel design method of ridge filters (RFs) has been developed for general proton beam lines which use a single-radius beam wobbling method. It can be applied to beam lines that transport both protons and carbon ions which are about three times longer than regular beam lines dedicated to protons. We designed an RF with an SOBP (spread-out Bragg peak) width of 60 mm in water for the 160-MeV proton beam of the HIMAC (Heavy Ion Medical Accelerator in Chiba)biology beam line using an existing model of the RE Yet we observed a slope in the SOBP region when we used the RE To elucidate the source of the slope, we have developed a new calculation model taking into account the geometry of the RF and a beam-limiting device. The source for the slope was found to be the large scattering effect of protons in the RF and beam restriction by a ring collimator (aperture diameter: 160 mm) placed just before the RE When both fluence reduction by the scattering effect of protons in the RF and the beam-collimation effect are taken into account, proper RFs can be designed universally for a given beam line arrangement using the singleradius beam-wobbling method from the start without any trial-and-error process. This will serve to reduce the commissioning time of newly designed beam delivery systems.
収録刊行物
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- Japanese Journal of Medical Physics
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Japanese Journal of Medical Physics 28 (2), 57-69, 2008
Japan Society of Medical Physics
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詳細情報 詳細情報について
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- CRID
- 1390282679648221696
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- NII論文ID
- 130004624479
- 10024347531
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- NII書誌ID
- AA11580542
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- COI
- 1:STN:280:DC%2BC3MfptVGhtw%3D%3D
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- NDL書誌ID
- 9689608
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- ISSN
- 13455354
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- PubMed
- 21976253
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可