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Dose profile measurement of a four-dimensional CT (4D-CT)

https://repo.qst.go.jp/records/53313
https://repo.qst.go.jp/records/53313
509c9501-62ba-4aff-baba-28fcf7ad9c4b
Item type 会議発表論文 / Conference Paper(1)
公開日 2004-02-20
タイトル
タイトル Dose profile measurement of a four-dimensional CT (4D-CT)
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_5794
資源タイプ conference paper
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 Endo, Masahiro

× Endo, Masahiro

WEKO 544096

Endo, Masahiro

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Mori, Shinichirou

× Mori, Shinichirou

WEKO 544097

Mori, Shinichirou

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Tsunoo, Takanori

× Tsunoo, Takanori

WEKO 544098

Tsunoo, Takanori

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Nishizawa, Kanae

× Nishizawa, Kanae

WEKO 544099

Nishizawa, Kanae

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Aoyama, Takahiko

× Aoyama, Takahiko

WEKO 544100

Aoyama, Takahiko

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遠藤 真広

× 遠藤 真広

WEKO 544101

en 遠藤 真広

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森 慎一郎

× 森 慎一郎

WEKO 544102

en 森 慎一郎

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角尾 卓紀

× 角尾 卓紀

WEKO 544103

en 角尾 卓紀

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西澤 かな枝

× 西澤 かな枝

WEKO 544104

en 西澤 かな枝

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抄録
内容記述タイプ Abstract
内容記述 [Purpose] We have developed a four-dimensional CT (4D-CT) using continuous rotation of cone-beam x-ray. The maximum field of view for 4D-CT is 128mm at the center of rotation in the longitudinal direction. In order to obtain appropriate estimations of exposure dose, we have measured dose profiles perpendicular to the rotation axis in a lucite cylinder of 320mm diameter.
[Methods] We have used cylindrical lucite phantom of 320mm diameter and 750mm length. Dose profiles were measured at the center and a peripheral point of 10mm depth. A pin silicon photodiode sensor with 3x3x3mm sensitive region was used as an x-ray detector, which was scanned along longitudinal direction in the phantom for collimator widths of 10, 32, 64, 96 and 128mm.
[Results] The dose profiles had long tails caused by scattered radiation. For 128 mm collimator width 90% of integral dose was distributed along 350mm length at the center and 220mm at the periphery. Even for 10 mm collimator width 90% of integral dose was distributed along 250mm length at the center and 160mm length at the periphery. [New or breakthrough work to be presented] Before the advent of multi-detector CT CTDI100 was a good estimation of exposure dose, because it expressed approximate integral dose for clinical scan conditions. For 4D-CT employing a variable collimator, the standard CTDI was not a good estimation. In the present work we measured dose profiles for 4D-CT, and showed long tails distributed more than 100mm out of the collimator edge.
[Conclusion] In order to estimate exposure dose for cone-beam CT such as 4D-CT, it should be recommended to measure integral dose over collimator width plus at least 200mm length.
書誌情報 Proceedings of SPIE

p. 000, 発行日 2004
ISSN
収録物識別子タイプ ISSN
収録物識別子 0277-786X
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