WEKO3
アイテム
INCORPORATING ORGAN MOTION UNCERTAINTIES INTO CARBON ION TREATMENT PLANNING
https://repo.qst.go.jp/records/68290
https://repo.qst.go.jp/records/6829002b24013-51c6-45e4-9bbc-b771812e4e9d
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2005-12-19 | |||||
| タイトル | ||||||
| タイトル | INCORPORATING ORGAN MOTION UNCERTAINTIES INTO CARBON ION TREATMENT PLANNING | |||||
| 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_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
HirokoKoyama-Ito
× HirokoKoyama-Ito× Miyamoto, Tadaaki× 伊藤 浩子× 宮本 忠昭 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In the charged particle therapy of moving tumors in strongly inhomogeneous volume such as lung cancer and liver cancer, how to define the distal margins is not well established. We report and evaluate a method adopted in the treatment planning of lung cancer with respiration gated carbon ion broad beams at NIRS [1,2]. During treatment a patient is irradiated while the respiration signal from on-skin monitor is close to end expiration phase of free breathing. Planning CT scans are taken gated with the same signal. The internal margin to compensate for uncertainties in tumor respiration movements is defined as typically 5 mm in cranial-caudal (CC) direction. As a means to deliver beams to the distal end of PTV, we use the extended range compensator (RC). It is designed based on a model that (1) the lung including tumor moves in CC direction sliding along the chest wall; (2) its thickness is unchanged by the use of a thermoplastic immobilization mold. Dose distributions calculated for different tumor locations show dose coverage to CTV, whereas the irradiated lung volume increases in enhanced degree due to the low electron density of lung. The uncertainties in tumor motion are determined from clinical experiences including fluoroscopy observations. In order to reduce motion margins further, more accurate tumor position monitor is required. In this respect the study with 4D CT scanner recently installed will be helpful. [1] Kanai, T et al., (1999) Int J Radiat Oncol Bio Phys. 44:201-210. [2] Minohara, S et al., (2000) Int J Radiat Oncol Bio Phys. 47:1097-1103. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | Particle Therapy Co-Operative Group,PTCOG43 | |||||
| 発表年月日 | ||||||
| 日付 | 2005-12-14 | |||||
| 日付タイプ | Issued | |||||
