Dose distribution in pediatric CT head examination: Phantom study

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

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

4 Citations (Scopus)

Abstract

Performing a detailed dose measurement is important so as to keep radiation doses during computed tomography (CT) examinations as low as reasonably achievable. To estimate in detail the dose distribution during pediatric CT examination of the head, a flexible acrylic sheet roll CT dosimetry phantom (SRCT-P) with radiochromic film (RF) was developed. The dose distributions in the SRCT-P (diameters of 6 [premature baby], 10 [neonate], and 14 [infant] cm) were evaluated. The SRCT-Ps were made by rolling up flexible acrylic sheets (1.1 g/cm3). RFs were positioned every 5 mm along the radius at each SRCT-P, starting at 10 mm (center) and ending on the surface. 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. The dose distributions along the z-axis at the center or on the surface showed a flat or wave pattern, respectively. When the mean surface dose at 10 cm diameter was taken as 100%, the mean surface doses at 6 or 14 cm diameters were 105 or 96%, respectively, and the mean center doses at 6, 10, and 14 cm were 109, 99, and 74%, respectively. The maximal dose area in the SRCT-P changed from the surface to the center with a decrease in the phantom diameter. The maximum-minimum doses and dose distribution of a CT examination can be measured separately by using the SRCT-P with RF.

Original languageEnglish
Title of host publication4th European Conference of the International Federation for Medical and Biological Engineering - ECIFMBE 2008
Pages775-779
Number of pages5
DOIs
Publication statusPublished - Dec 1 2008
Event4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008 - Antwerp, Belgium
Duration: Nov 23 2008Nov 27 2008

Publication series

NameIFMBE Proceedings
Volume22
ISSN (Print)1680-0737

Other

Other4th European Conference of the International Federation for Medical and Biological Engineering, ECIFMBE 2008
CountryBelgium
CityAntwerp
Period11/23/0811/27/08

Keywords

  • Computed tomography
  • Phantom
  • Radiation dosimetry
  • Radiochromic film

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

Fingerprint Dive into the research topics of 'Dose distribution in pediatric CT head examination: Phantom study'. Together they form a unique fingerprint.

Cite this