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Optimum size of a calibration phantom for x-ray CT to convert Hounsfield units to stopping-power-ratios in charged-particle therapy treatment planning
https://repo.qst.go.jp/records/72805
https://repo.qst.go.jp/records/728053348c6ba-12db-4a4e-9c3c-d2e79d7be9b9
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-05-30 | |||||
| タイトル | ||||||
| タイトル | Optimum size of a calibration phantom for x-ray CT to convert Hounsfield units to stopping-power-ratios in charged-particle therapy 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 |
Inaniwa, Taku
× Inaniwa, Taku× Tashima, Hideaki× Kanematsu, Nobuyuki× 稲庭 拓× 田島 英朗× 兼松 伸幸 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | In charged-particle therapy treatment planning, the volumetric distribution of stopping power ratios (SPRs) of body tissues relative to water is used for patient dose calculation. The distribution is conventionally obtained from computed tomography (CT) images of a patient.using predetermined conversion functions from the CT numbers to the SPRs. One of the biggest uncertainty sources of patient SPR estimation is insufficient correction of beam hardening arising from the mismatch between the size of the patient cross section and the calibration phantom for producing the conversion functions. The uncertainty would be minimized by selecting a suitable size of the cylindrical water calibration phantom referred to as an "effective size" of the patient cross section, L.effective. In this study, we investigated the L.effective for pelvis, abdomen, thorax, and head and neck regions by simulating an ideal CT system using volumetric models of the reference male and female phantoms. The L.effective values were 23.3, 20.3, 22.7 and 18.8 cm for the pelvis, abdomen, thorax, and head and neck regions, respectively. |
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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 | 57th Annual Conference of the Particle Therapy Co-operative Group (PTCOG57) | |||||
| 発表年月日 | ||||||
| 日付 | 2018-05-25 | |||||
| 日付タイプ | Issued | |||||
