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  1. C100 医学部/医学系研究科
  2. C100a 雑誌掲載論文
  3. 学術雑誌

Commissioning of modulator-based IMRT with XiO treatment planning system

http://hdl.handle.net/2237/20613
http://hdl.handle.net/2237/20613
e28ca9fe-6f6f-4761-8bcd-a69ee7a9dcf0
名前 / ファイル ライセンス アクション
Paper_MP.pdf Paper_MP.pdf (403.2 kB)
Fig_Table_MP.pdf Fig_Table_MP.pdf (1.6 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2014-10-24
タイトル
タイトル Commissioning of modulator-based IMRT with XiO treatment planning system
言語 en
著者 Oguchi, Hiroshi

× Oguchi, Hiroshi

WEKO 53818

en Oguchi, Hiroshi

Search repository
Obata, Yasunori

× Obata, Yasunori

WEKO 53819

en Obata, Yasunori

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 © 2009 American Association of Physicists in Medicine
キーワード
主題Scheme Other
主題 radiation therapy
キーワード
主題Scheme Other
主題 intensity modulation
キーワード
主題Scheme Other
主題 physical modulator
キーワード
主題Scheme Other
主題 dose verification
抄録
内容記述 This article describes the procedures for correction of the modulator thickness and commissioning of the XiO treatment planning system (TPS) for modulator-based intensity modulated radiation therapy (M-IMRT). This modulator manufacturing system adopts a method in which the modulator is milled using a floor-type computer-aided numerical control milling machine (CNC-mill) with modulator data calculated by XiO TPS. XiO TPS uses only effective attenuation coefficients (EAC) for modulator thickness calculation. This article describes a modified method for assessing modulator thickness. A two-dimensional linear attenuation array was used to correct the modulator thickness calculated by XiO. Narrow-beam geometry was used for measuring the linear attenuation coefficient (LAC) at off-axis positions (OAP) for varying brass thicknesses. An equation for the two-dimensional LAC ratio (2D-LACR) can be used to calculate the corrected modulator thickness. It is assumed that the broad beam EAC of a small field varies with the brass thickness and the OAP distance in the same way as that of LACR, so the two-dimensional EAC (2D-EAC) is equal to the EAC corrected using the LACR. The dose distribution was evaluated for three geometric patterns and one clinical case on low energy x ray (4MV) with a large field size(20×20cm2). The results using the proposed correction method of modulator thickness showed a good agreement between the measured dose distributions and the dose distributions calculated by TPS with the correction. Hence, the method is effective to improve the accuracy of M-IMRT in XiO TPS. An important problem for the brassmodulator is the milling condition, such as the drill diameter and the cutting pitch size. It is necessary to improve the accuracy of M-IMRT for the “softening” and “hardening” effects of the beam to be considered in dose calculation in patients and the modulator profile design.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 AIP Publishing
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ AM
出版タイプResource http://purl.org/coar/version/c_ab4af688f83e57aa
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1118/1.2996285
ISSN
収録物識別子タイプ PISSN
収録物識別子 0094-2405
書誌情報 en : Medical Physics

巻 36, 号 1, p. 261-269, 発行日 2009-01
著者版フラグ
値 author
URI
識別子 http://dx.doi.org/10.1118/1.2996285
識別子タイプ DOI
URI
識別子 http://hdl.handle.net/2237/20613
識別子タイプ HDL
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