Dose distribution in pediatric CT abdominal examination: Phantom study

R. Gotanda, T. Katsuda, T. Gotanda, A. Tabuchi, H. Yatake, Y. Takeda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

To keep radiation doses during computed tomography (CT) examinations as low as reasonably achievable, performing a detailed dose measurement is important. A flexible acrylic sheet roll CT dosimetry phantom (SRCT-P) with radiochromic film (RF) was developed to estimate in detail the dose distribution during pediatric CT examination. The SRCT-Ps were elliptically-shaped by rolling up flexible acrylic sheets (1.1 g/cm3). The dose distributions in the SRCT-P (body thickness and width: 6-8 cm [neonates], 10-12 cm [infants], and 14-16 cm [three-year-old children]) were evaluated. RFs were positioned from the center to the surface along the long- and short-axis directions in each SRCT-P. The scanning parameters of the single detector CT were 120 kV, 250 mA, 1.0 sec/rot, a slice thickness of 5 mm, and a 1.0 beam pitch. When the mean center dose at 10-12 cm on the SRCT-P was taken as 100%, the mean center doses at 6-8..or 14-16 cm were 145..or 43%, respectively, and the mean surface doses for 0, 90, and 180 degrees at 6-8, 10-12, and 14-16 cm of the SRCT-P were as follows: 158%, 159%, and 140%; 132%, 125%, and 116%; and 164%, 128%, and 131%, respectively. The center dose was increased with a decrease in the phantom size. The surface doses were decreased with decreasing phantom sizes of 14-16 to 10-12 cm; however, surface doses were increased with decreasing phantom sizes of 10-12 to 6-8 cm. The detail dose distribution of a CT examination can be measured separately by using a SRCT-P with a RF.

Original languageEnglish
Title of host publicationWorld Congress on Medical Physics and Biomedical Engineering
Subtitle of host publicationRadiation Protection and Dosimetry, Biological Effects of Radiation
Pages45-48
Number of pages4
Edition3
DOIs
Publication statusPublished - Dec 1 2009
EventWorld Congress on Medical Physics and Biomedical Engineering: Radiation Protection and Dosimetry, Biological Effects of Radiation - Munich, Germany
Duration: Sep 7 2009Sep 12 2009

Publication series

NameIFMBE Proceedings
Number3
Volume25
ISSN (Print)1680-0737

Other

OtherWorld Congress on Medical Physics and Biomedical Engineering: Radiation Protection and Dosimetry, Biological Effects of Radiation
CountryGermany
CityMunich
Period9/7/099/12/09

Keywords

  • Computed tomography
  • Phantom
  • Radiation dosimetry
  • Radiochromic film

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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  • Cite this

    Gotanda, R., Katsuda, T., Gotanda, T., Tabuchi, A., Yatake, H., & Takeda, Y. (2009). Dose distribution in pediatric CT abdominal examination: Phantom study. In World Congress on Medical Physics and Biomedical Engineering: Radiation Protection and Dosimetry, Biological Effects of Radiation (3 ed., pp. 45-48). (IFMBE Proceedings; Vol. 25, No. 3). https://doi.org/10.1007/978-3-642-03902-7-14