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Water-Equivalent Pathlength Reproducibility Due to Respiratory Pattern Variation in Charged-Particle Pancreatic Radiotherapy
https://repo.qst.go.jp/records/48433
https://repo.qst.go.jp/records/484336e6257ae-44f2-47f3-8b01-8c0b9938132b
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-01-11 | |||||
| タイトル | ||||||
| タイトル | Water-Equivalent Pathlength Reproducibility Due to Respiratory Pattern Variation in Charged-Particle Pancreatic Radiotherapy | |||||
| 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 | |||||
| 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 |
Kumagai, Motoki
× Kumagai, Motoki× Mori, Shinichiro× Hara, Ryusuke× Asakura, Hiroshi× Kishimoto, Riwa× Katou, Hirotoshi× Yamada, Shigeru× Kandatsu, Susumu× 熊谷 始紀× 森 慎一郎× 原 竜介× 浅倉 裕史× 岸本 理和× 加藤 博敏× 山田 滋× 神立 進 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We evaluated the water-equivalent length (WEL) reproducibility due to variation in the external respiratory marker position when using a 4DCT scan in respiratory-gated charged-particle treatment. Two sets of pancreatic 4DCT data from two patients were acquired under free breathing conditions with 256 multi-slice CT. The 4DCT data included two exhalation phases, and the respiratory patterns in each patient differed, one being regular and the other, irregular. The WEL calculation region is defined in the first respiratory cycle by two planes, one at the patient entrance surface and the other behind the target in the anterior-posterior (AP) and posterior-anterior (PA) directions. In the regular respiratory pattern, the WEL variation within the target region was less than 1.7 mm between the first and second exhalations in both AP and PA calculation directions. However, in the irregular breathing pattern, the respiratory amplitude at the second exhalation was 20% lower than that at the first exhalation; therefore, WEL variations from 8.1 mm to -9.1 mm and from 3.1 mm to -3.4 mm were observed within the target region in the AP and PA calculation directions, respectively. The WEL variation in the PA direction was smaller than that in the AP direction because the abdominal thickness is affected more in the AP direction. Respiratory pattern variation affects WEL values even in the respiratory-gated phase. This variation should be considered in treatment planning, and necessary improvements in respiratory reproducibility should be made. | |||||
| 書誌情報 |
Radiological Physics and Technology 巻 2, 号 1, p. 112-118, 発行日 2009-01 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1865-0333 | |||||
