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Commissioning of modulator-based IMRT with XiO treatment planning system
http://hdl.handle.net/2237/20613
http://hdl.handle.net/2237/20613e28ca9fe-6f6f-4761-8bcd-a69ee7a9dcf0
| 名前 / ファイル | ライセンス | アクション |
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Paper_MP.pdf (403.2 kB)
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Fig_Table_MP.pdf (1.6 MB)
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| 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× Obata, Yasunori |
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| 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 | ||||||
| 内容記述タイプ | Abstract | |||||
| 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 | |||||
| 出版者 | ||||||
| 出版者 | AIP Publishing | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | 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 |
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| 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 | |||||
