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

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Abstract

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.

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Acknowledgments

This work was supported by JSPS KAKENHI Grant Number 15K19205.

Author information

Author notes

  1. Kazuki Takegami

    Present address: Yamaguchi University Hospital, 1-1-1 MinamiKogushi, Ube, Yamaguchi, 755-8505, Japan

Authors and Affiliations

  1. Graduate School of Health Sciences, Tokushima University, 3-18-15 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Kazuki Takegami, Hiroki Okino & Natsumi Kimoto

  2. Graduate School of Biomedical Sciences, Tokushima University, 3-18-15 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Hiroaki Hayashi & Yuki Kanazawa

  3. School of Health Sciences, Tokushima University, 3-18-15 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Itsumi Maehata

  4. Nagase Landauer, LTD., C22-1 Suwa, Tsukuba, Ibaraki, 300-2686, Japan

    Tohru Okazaki, Takuya Hashizume & Ikuo Kobayashi

Authors
  1. Kazuki Takegami
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  2. Hiroaki Hayashi
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Corresponding author

Correspondence to Hiroaki Hayashi.

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Conflict of interest

T. Okazaki, T. Hashizume, and I. Kobayashi are employees of Nagase Landauer Ltd. and are collaborative researchers.

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Takegami, K., Hayashi, H., Okino, H. et al. Estimation of identification limit for a small-type OSL dosimeter on the medical images by measurement of X-ray spectra. Radiol Phys Technol 9, 286–292 (2016). https://doi.org/10.1007/s12194-016-0362-5

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  • DOI: https://doi.org/10.1007/s12194-016-0362-5

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