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Entrance surface dose measurements using a small OSL dosimeter with a computed tomography scanner having 320 rows of detectors

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Abstract

Entrance surface dose (ESD) measurements are important in X-ray computed tomography (CT) for examination, but in clinical settings it is difficult to measure ESDs because of a lack of suitable dosimeters. We focus on the capability of a small optically stimulated luminescence (OSL) dosimeter. The aim of this study is to propose a practical method for using an OSL dosimeter to measure the ESD when performing a CT examination. The small OSL dosimeter has an outer width of 10 mm; it is assumed that a partial dose may be measured because the slice thickness and helical pitch can be set to various values. To verify our method, we used a CT scanner having 320 rows of detectors and checked the consistencies of the ESDs measured using OSL dosimeters by comparing them with those measured using Gafchromic™ films. The films were calibrated using an ionization chamber on the basis of half-value layer estimation. On the other hand, the OSL dosimeter was appropriately calibrated using a practical calibration curve previously proposed by our group. The ESDs measured using the OSL dosimeters were in good agreement with the reference ESDs from the Gafchromic™ films. Using these data, we also estimated the uncertainty of ESDs measured with small OSL dosimeters. We concluded that a small OSL dosimeter can be considered suitable for measuring the ESD with an uncertainty of 30 % during CT examinations in which pitch factors below 1.000 are applied.

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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, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Kazuki Takegami & Natsumi Kimoto

  2. Graduate School of Biomedical Sciences, Tokushima University, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Hiroaki Hayashi, Yuki Kanazawa, Kousaku Higashino, Kazuta Yamashita & Fumio Hayashi

  3. Tokushima University Hospital, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Kenji Yamada, Kousaku Higashino, Kazuta Yamashita & Fumio Hayashi

  4. School of Health Sciences, Tokushima University, 3-18-5 Kuramoto-cho, Tokushima, Tokushima, 770-8503, Japan

    Yoshiki Mihara

  5. 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 collaborating researchers.

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Takegami, K., Hayashi, H., Yamada, K. et al. Entrance surface dose measurements using a small OSL dosimeter with a computed tomography scanner having 320 rows of detectors. Radiol Phys Technol 10, 49–59 (2017). https://doi.org/10.1007/s12194-016-0366-1

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  • DOI: https://doi.org/10.1007/s12194-016-0366-1

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