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

URI http://www.lib.tokushima-u.ac.jp/repository/metadata/110814
Title
Entrance surface dose measurements using a small OSL dosimeter with a computed tomography scanner having 320 rows of detectors
Authors
Takegami, Kazuki
Hayashi, Hiroaki
Yamada, Kenji 
Mihara, Yoshiki 
Kimoto, Natsumi
Kanazawa, Yuki
Higashino, Kousaku 
Yamashita, Kazuta 
Hayashi, Fumio 
Okazaki, Tohru 
Hashizume, Takuya 
Kobayashi, Ikuo 
Authors_Transcription
タケガミ, カズキ
ハヤシ, ヒロアキ
ヤマダ, ケンジ
ミハラ, ヨシキ
キモト, ナツミ
カナザワ, ユウキ
ヒガシノ, コウサク
ヤマシタ, カズタ
ハヤシ, フミオ
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
東野, 恒作
Authors_Affiliation
Graduate School of Health Sciences, Tokushima University
Graduate School of Biomedical Sciences, Tokushima University
Tokushima University Hospital
School of Health Sciences, Tokushima University
Nagase-Landauer, Ltd.
Yamaguchi University Hospital
Keywords
OSL dosimeter 
Gafchromic™ film 
Entrance surface dose 
Computed tomography 
Description

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.

Publisher
Springer Japan
Content Type
学術雑誌論文
ISSN・ISBN
18650333
18650341
NCID
AA12236881
Journal Title
Radiological Physics and Technology
Volume
10
ISSUE
1
SPage
49
EPage
59
Published Date
2016-06-24
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/s12194-016-0366-1.

edb id
313222
URL ( Publisher's Version )
set
徳島大学
FullText URL
Language
eng
TextVersion
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