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
Title
Estimation of identification limit for a small-type OSL dosimeter on the medical images by measurement of X-ray spectra
Authors
Takegami, Kazuki 
Hayashi, Hiroaki
Okino, Hiroki
Kimoto, Natsumi 
Maehata, Itsumi 
Kanazawa, Yuki 
Okazaki, Tohru 
Hashizume, Takuya 
Kobayashi, Ikuo 
Authors_Transcription
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
Authors_Alternative
林, 裕晃
金澤, 裕樹
Authors_Affiliation
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
Keywords
OSL dosimeter
CdTe detector
Patient exposure dose measurement
Diagnostic X-rays
Description

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.

Publisher
Springer Japan
Content Type
学術雑誌論文
ISSN・ISBN
18650333
18650341
NCID
AA12236881
Journal Title
Radiological Physics and Technology
Volume
9
ISSUE
2
SPage
286
EPage
292
Published Date
2016-06-03
remark

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
URL ( Publisher's Version )
set
徳島大学
FullText URL
Language
eng
TextVersion
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