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Patient-specific QA for moving target irradiation with a scanned ion beam in NIRS-HIMAC
https://repo.qst.go.jp/records/71659
https://repo.qst.go.jp/records/7165947d84cf5-a585-4aa3-bc93-72a3419916fc
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2015-05-26 | |||||
| タイトル | ||||||
| タイトル | Patient-specific QA for moving target irradiation with a scanned ion beam in NIRS-HIMAC | |||||
| 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 |
原, 洋介
× 原, 洋介× 原 洋介 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Purpose: Three-dimensional (3D) pencil-beam scanning technique has been utilized since 2011 at the Heavy Ion Medical Accelerator in Chiba (HIMAC). Beam delivery system and treatment planning software (TPS) require dosimetric patient-specific QA to check each individual plan. Any change in the scanned beams will result in a significant impact on the irradiation dose. In particular, in moving target irradiation with a scanned ion beam, the interplay effect between the target motion and scanned beams is a problem, because this effect cause over or under dosage in the target volume. Therefore, patient-specific QA for moving target irradiation requires additional procedure. Methods: In a conventional patient specific QA flow in NIRS-HIMAC, the planned dose distribution is converted to the dose distribution in the water phantom. After that, we perform the measurement and analysis. In the measurement, 2D ionization chamber with water column is used. In an additional QA for moving target irradiation, we placed 2D ionization chamber on the PMMA plate tilted with respect to the beam axis. The PMMA plate was set on the stage of the moving phantom. The moving phantom was moved according to patient data. We measured the dose distribution for both the static target and the moving target. We compared the results for the moving target with those for the static targets by means of a gamma index analysis Results: In the conventional patient-specific QA, the measured dose distributions agreed well with those calculated by the TPS, and the QA criteria were satisfied in all measurements. In the additional patient-specific QA, the gamma analysis between the moving and static targets showed the good agreement. Conclusions: We performed the additional patient-specific QA for moving target irradiation with a scanned ion beam. We confirmed that this new technique was a beneficial QA procedure for moving target irradiation. |
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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 | 54th Annual Conference of the Particle Therapy Co-Operative Group (PTCOG54) | |||||
| 発表年月日 | ||||||
| 日付 | 2015-05-20 | |||||
| 日付タイプ | Issued | |||||
