Estimation of identification limit for a small-type OSL dosimeter on the medical images by measurement of X-ray spectra

URI http://www.lib.tokushima-u.ac.jp/repository/metadata/110813
タイトル
Estimation of identification limit for a small-type OSL dosimeter on the medical images by measurement of X-ray spectra
作成者
Takegami, Kazuki 
Hayashi, Hiroaki
Okino, Hiroki
Kimoto, Natsumi 
Maehata, Itsumi 
Kanazawa, Yuki 
Okazaki, Tohru 
Hashizume, Takuya 
Kobayashi, Ikuo 
作成者ヨミ
タケガミ, カズキ
ハヤシ, ヒロアキ
オキノ, ヒロキ
キモト, ナツミ
マエハタ, イツミ
カナザワ, ユウキ
オカザキ, トオル
ハシズメ, タクヤ
コバヤシ, イクオ
作成者別表記
林, 裕晃
金澤, 裕樹
作成者所属
Graduate School of Health Sciences, Tokushima University
Graduate School of Biomedical Sciences, Tokushima University
School of Health Sciences, Tokushima University
Nagase Landauer, LTD.
Yamaguchi University Hospital
キーワード
OSL dosimeter
CdTe detector
Patient exposure dose measurement
Diagnostic X-rays
抄録

Our aim in this study is to derive an identification limit on a dosimeter for not disturbing a medical image when patients wear a small-type optically stimulated luminescence (OSL) dosimeter on their bodies during X-ray diagnostic imaging. For evaluation of the detection limit based on an analysis of X-ray spectra, we propose a new quantitative identification method. We performed experiments for which we used diagnostic X-ray equipment, a soft-tissue-equivalent phantom (1–20 cm), and a CdTe X-ray spectrometer assuming one pixel of the X-ray imaging detector. Then, with the following two experimental settings, corresponding X-ray spectra were measured with 40–120 kVp and 0.5–1000 mAs at a source-to-detector distance of 100 cm: (1) X-rays penetrating a soft-tissue-equivalent phantom with the OSL dosimeter attached directly on the phantom, and (2) X-rays penetrating only the soft-tissue-equivalent phantom. Next, the energy fluence and errors in the fluence were calculated from the spectra. When the energy fluence with errors concerning these two experimental conditions was estimated to be indistinctive, we defined the condition as the OSL dosimeter not being identified on the X-ray image. Based on our analysis, we determined the identification limit of the dosimeter. We then compared our results with those for the general irradiation conditions used in clinics. We found that the OSL dosimeter could not be identified under the irradiation conditions of abdominal and chest radiography, namely, one can apply the OSL dosimeter to measurement of the exposure dose in the irradiation field of X-rays without disturbing medical images.

出版者
Springer Japan
資料タイプ
学術雑誌論文
ISSN・ISBN
18650333
18650341
cat書誌id
AA12236881
掲載誌名
Radiological Physics and Technology
9
2
開始ページ
286
終了ページ
292
発行日
2016-06-03
備考

Copyright © Japanese Society of Radiological Technology and Japan Society of Medical Physics 2016
The final publication is available at Springer via http://dx.doi.org/10.1007/s12194-016-0362-5.

edb id
312281
出版社版URL
部局
徳島大学
ファイル
本文言語
eng
著者版フラグ
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