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Positional Dependence of the CT number use of a Cone-beam CT Scanner for an Electron Density Phantom in Particle Beam Therapy
https://repo.qst.go.jp/records/46682
https://repo.qst.go.jp/records/466825f90a7c1-a5dc-498a-a296-7120ae59c7bf
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2013-12-12 | |||||
| タイトル | ||||||
| タイトル | Positional Dependence of the CT number use of a Cone-beam CT Scanner for an Electron Density Phantom in Particle Beam Therapy | |||||
| 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_6501 | |||||
| 資源タイプ | journal article | |||||
| 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 |
Kusano, Yohsuke
× Kusano, Yohsuke× Uesaka, Saki× Yajima, Kaori× Kumagai, Motoki× Mizuno, Hideyuki× Mori, Shinichiro× 草野 陽介× 上坂 紗紀× 矢島 佳央理× 熊谷 始紀× 水野 秀之× 森 慎一郎 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We evaluated the CT number accuracy in determining a CT calibration method for treatment planning by use of a 256 multi-slice CT (MSCT) scanner. An electron density phantom, which extends full length in the longitudinal direction, was scanned by the 256 MSCT scanner in a single rotation. We inserted four types of samples (air, 100 % ethanol, 40 wt% aqueous K2HPO4, and water) into the phantom. The regions of interest were set for all image slices, and the average CT number was calculated in the transverse and longitudinal sections. For the transverse image direction, the CT number became lower toward the center of the phantom with almost all samples. The causes of these phenomena might be attributed to the effects of scattered radiation and those of beam hardening due to the high-atomic-number material (40 wt% aqueous K2HPO4). However, the phenomena were too complicated to allow us to determine their causes only from the present studies. Meanwhile, for increasing the accuracy of the CT number calibration, a single sample should be inserted, and this step should be repeated with different samples. For the longitudinal direction, the CT number for a 40 wt % aqueous K2HPO4 sample increased by 30 HU from the anode to the cathode side due to variations in the X-ray energy caused by the heel effect. The caveat is that the CT number varies in the longitudinal direction when a CT scanner with a wide beam width is used. | |||||
| 書誌情報 |
Radiological Physics and Technology 巻 6, p. 241-247, 発行日 2013-02 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1865-0333 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://www.editorialmanager.com/rpte/ | |||||
| 関連名称 | http://www.editorialmanager.com/rpte/ | |||||
