ID 110813
Author
Takegami, Kazuki  Graduate School of Health Sciences, Tokushima University|Yamaguchi University Hospital
Okino, Hiroki Graduate School of Health Sciences, Tokushima University
Kimoto, Natsumi  Graduate School of Health Sciences, Tokushima University
Maehata, Itsumi  School of Health Sciences, Tokushima University
Okazaki, Tohru  Nagase Landauer, LTD.
Hashizume, Takuya  Nagase Landauer, LTD.
Kobayashi, Ikuo  Nagase Landauer, LTD.
Keywords
OSL dosimeter
CdTe detector
Patient exposure dose measurement
Diagnostic X-rays
Content Type
Journal Article
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.
Journal Title
Radiological Physics and Technology
ISSN
18650333
18650341
NCID
AA12236881
Publisher
Springer Japan
Volume
9
Issue
2
Start Page
286
End Page
292
Sort Key
286
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
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Author
departments
Medical Sciences