Study on age-specific dose evaluation and optimization of infant CT examinations

2015 Fiscal Year Final Research Report

• Project/Area Number: 25350526
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Biomedical engineering/Biomaterial science and engineering
• Research Institution: Nagoya University
• Principal Investigator: YAMAUCHI-KAWAURA CHIYO 名古屋大学, 医学(系)研究科(研究院), 講師 (60324422)
• Co-Investigator(Kenkyū-buntansha): IKEDA Mitsuru 名古屋大学, 大学院医学系研究科, 教授 (50184437) ; IMAI Kuniharu 名古屋大学, 大学院医学系研究科, 教授 (20335053) ; FUJII Keisuke 名古屋大学, 大学院医学系研究科, 助教 (40469937)
• Co-Investigator(Renkei-kenkyūsha): AKAHANE Keiichi 量子科学技術研究開発機構, 放射線医学総合研究所, チームリーダー (80202521)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 放射線計測学 / CT / 人体ファントム / 乳幼児 / 医療被ばく

Outline of Final Research Achievements

In this study, to estimate Japanese patient doses in infant CT examinations from dose measurements using anthropomorphic phantoms, we developed a Japanese 3-year-old phantom and constructed an in-phantom dosimetry system consisting of radiophotoluminescence glass dosemeters installed at various tissue/organ sites within the phantom. To investigate whether the phantom materials and structure with the 3-year-old phantom were appropriate for dose assessment in CT examinations, we compared organ and effective doses between the 3-year-old in-phantom dosimetry system and a web-based CT dose calculation system, WAZA-ARI. The doses for organs within scan regions and effective doses between both systems coincided with each other within allowable error of 20%. It was found from age-specific dose measurements that the effective doses for 0- to 6-year-old patients in head, chest and abdominopelvic CT examinations were equivalent regardless of age.

Free Research Field

放射線計測学