WEKO3
アイテム
Conceptualization of ionization dose to quantify radiation therapy doses
https://repo.qst.go.jp/records/2002174
https://repo.qst.go.jp/records/20021748e680f9c-e587-4885-820f-3c0839cbfbcb
| アイテムタイプ | 会議発表用資料 / Presentation(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2025-06-10 | |||||||||
| タイトル | ||||||||||
| タイトル | Conceptualization of ionization dose to quantify radiation therapy doses | |||||||||
| 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_6670 | |||||||||
| 資源タイプ | conference poster | |||||||||
| 著者 |
Kanematsu Nobuyuki
× Kanematsu Nobuyuki
× Inaniwa Taku
|
|||||||||
| 抄録 | ||||||||||
| 内容記述 | Background and AimsThis study conceptualizes the ionization dose to water as the dose absorbed to water and expended exclusively on ionization, which is essential for cancer treatment, and formulates its dosimetric procedures for high-energy photon, electron, proton, and ion beams. It also aims to design optimal ionization chambers to reduce the large dosimetric uncertainty for proton and ion beams.MethodsBased on the international code of practice, the dosimetric procedure without W-value correction was formulated for all these beam types, and that without stopping-power-ratio correction was formulated for proton and ion beams. For the latter, water-equivalent gas was considered for gas-sealed ionization chambers. The proposed reference dosimetry was simulated for virtual test beams.ResultsFor photon and electron beams, the ionization dose was essentially equivalent to the absorbeddose. For proton and ion beams, the dosimetric uncertainty would be greatly reduced to 0.7 % and 1.0 %, respectively, with water-equivalent gas, for which nitrogen-based gas mixtures with helium, methane, and ethane were designed. Ionization dosimetry with the helium mixture was prone and sensitive to leakage, while the methane and ethane mixtures were flammable.ConclusionsThe ionization dose with minimal beam-quality correction represents radiation therapy doses of improved accuracy, especially for proton and ion beams, and will be advantageously applicable to non-reference conditions and complex clinical beams of various types. | |||||||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||||||
| 内容記述 | 63rd Annual PTCOG Conference | |||||||||
| 発表年月日 | ||||||||||
| 日付 | 2025-06-04 | |||||||||
