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Comparison of patient doses in 256-slice CT and 16-slice CT scanners
https://repo.qst.go.jp/records/44335
https://repo.qst.go.jp/records/443358c62a2f3-0faa-4b90-b123-77c02a4827b2
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2006-06-23 | |||||
| タイトル | ||||||
| タイトル | Comparison of patient doses in 256-slice CT and 16-slice CT scanners | |||||
| 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 |
Mori, Shinichiro
× Mori, Shinichiro× Endo, Masahiro× Nishizawa, Kanae× Murase, Kenya× Fujiwara, Hideaki× Tanada, Shuji× 森 慎一郎× 遠藤 真広× 西澤 かな枝× 村瀬 研也× 棚田 修二 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The 256-slice CT-scanner has been developed at National Institute of Radiological Sciences. Nominal beam width was 128 mm in the longitudinal direction. When scanning continuously at the same position to obtain four-dimensional (4D) images, the effective dose is increased in proportion to the scan time. Our purposes in this work were to measure the dose for the 256-slice CT, to compare it to that of the 16-slice CT-scanner, and to make a preliminary assessment of dose for dynamic 3D imaging (volumetric cine imaging). Our group reported previously that the phantom length and integration range for dosimetry needed to be at least 300 mm to represent more than 90 % of the line integral dose with the beam width between 20 mm and 138 mm. In order to obtain good estimates of the dose, we measured its line integral dose over a 300 mm range in PMMA (polymethylmethacrylate) phantoms of 160 mm or 320 mm diameter and 300 mm length. Doses for both CTs were compared for clinical protocol. The results showed that the 256-slice CT has smaller dose than the 16-slice CT in all examinations. The reason is the following: x-ray photons irradiated to the marginal portion near the slice collimator edge did not contribute to image formation, but they increased dose; the relative contribution of this portion was smaller for 256-slice CT than for 16-slice CT. Besides the 256-slice CT could take a large volume data in a one-rotation scan with sufficient image quality. For volumetric cine imaging, we found an acceptable scan time would be 6-11 s depending on examinations if dose must be limited to the same values as routine examinations with a conventional multi-detector CT. Finally, we discussed the studies necessary to make full usage of volumetric cine imaging. | |||||
| 書誌情報 |
British Journal of Radiology 巻 79, p. 56-61, 発行日 2006-01 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0007-1285 | |||||
