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Experimental Study on Monitoring the Clinical Beam Purity in Multiple-Ion Beam Operation for Heavy-Ion Radiotherapy
https://repo.qst.go.jp/records/76713
https://repo.qst.go.jp/records/76713ba62766e-9286-4149-83db-4089442298ab
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2019-09-10 | |||||
| タイトル | ||||||
| タイトル | Experimental Study on Monitoring the Clinical Beam Purity in Multiple-Ion Beam Operation for Heavy-Ion 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_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 |
Mizushima, Kota
× Mizushima, Kota× Muramatsu, Masayuki× Sung-Hyun, Lee× Shirai, Toshiyuki× Mizushima, Kota× Muramatsu, Masayuki× Sung-Hyun, Lee× Shirai, Toshiyuki |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | National Institute of Radiological Sciences (NIRS) has performed carbon-ion radiotherapy since 1994 using the Heavy Ion Medical Accelerator in Chiba (HIMAC) [1], and the treatments with the carbon-ion beams have been successfully carried out there for more than 12000 patients. The NIRS has recently investigated multiple-ion therapy [2] using the beams of four ion species, helium, carbon, oxygen and neon ions, to improve the treatment results of refractory cancer. For this therapy, we have tested the method to quickly change the ion species of the irradiation beams. In this method, the beams of four ions, He2+, C2+, O3+ and Ne4+, are provided by only one ion source with fast gas-switching operation [3], and they are accelerated, after fully stripping electrons through a carbon foil, up to the energy of 430 MeV/u by the linear accelerators (linacs) and the synchrotron. However, when the fully-stripped ions, e.g. C6+ and O8+, are mixed with the He2+ beam, they are also accelerated and irradiated together because of an equal mass-to-charge ratio (A/z). Although irradiation of the unwanted ions should be avoided, it is difficult to remove them with the same A/z in the transport line. Therefore, the contamination of the clinical beam must be reduced by the ion source [3], and it is desirable to verify the beam purity before irradiation. For this purpose, we have developed the measurement system to monitor the beam purity. This system can measure the averaged charge number of the beam particle by using an ionization chamber and a Faraday cup. We have performed the beam experiments to verify the validity of our beam-purity monitoring system at the HIMAC. An overview of our system features will be presented and discussed through the experimental results. | |||||
| 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 | 18th International Conference on Ion Sources (ICIS’19) | |||||
| 発表年月日 | ||||||
| 日付 | 2019-09-04 | |||||
| 日付タイプ | Issued | |||||
