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Study on the relationship between exposure dose and CT dose index for various CT scanners using Monte Carlo simulation and human voxel phantoms
https://repo.qst.go.jp/records/72498
https://repo.qst.go.jp/records/72498b1518b94-d967-4cd3-a30c-172347037dd6
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2017-10-23 | |||||
| タイトル | ||||||
| タイトル | Study on the relationship between exposure dose and CT dose index for various CT scanners using Monte Carlo simulation and human voxel phantoms | |||||
| 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 |
古場, 裕介
× 古場, 裕介× 古場 裕介 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Purpose: WAZA-ARI is the web-based open system for X-ray CT dose calculator, which has been developed by NIRS and Oita University of Nursing and Health Sciences and the Japan Atomic Energy Agency(JAEA) [1]. We constructed source models based on actual measurements. The selectable CT scanners in WAZA-ARI are still not enough despite the continuing addition of CT scanners because the CT developers deliver a steady stream of new products. In this study, we investigate the relationship between exposure dose and CT dose index(CTDI) for various CT scanners in WAZA-ARI system and categorized CT sources based on parameter of radiation quality and fluence distribution in order to calculate organ dose for arbitrary CT models. Methods: The organ doses in CT exposure were calculated using Monte Carlo code, PHITS and Japanese adult voxel phantoms developed by JAEA [2]. We calculated the organ doses and CTDIs for about fifty CT sources. We investigated the relationship between the organ dose and CTDI in typical CT exposure for head and body. Results: The calculated organ doses per CTDI free air depended on the effective energy and the fluence distribution of X-ray from CT scanner. The radiation quality depended on the ratio of CTDI center and CTDI free air, and the fluence distribution depended on the ratio of CTDI peripheral and CTDI free air. The ratio of CTDI center/peripheral and CTDI free air was useful to categorized CT sources, and CT scanners with near CTDI ratios showed near exposure doses per CTDI free air. Conclusions: CT sources were categorized using The ratio of CTDI center/peripheral and CTDI free air. Existing calculated organ doses data for CT scanners were diverted to the dose calculation for CT scanner with near CTDI ratios. |
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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 | International Conference on Monte Carlo Techniques for Medical Applications (MCMA2017) | |||||
| 発表年月日 | ||||||
| 日付 | 2017-10-16 | |||||
| 日付タイプ | Issued | |||||
