Dose distribution in pediatric CT head examination using a new phantom with radiochromic film

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

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20 Citations (Scopus)

Abstract

Performing a detailed dose measurement is important 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 sheet roll CT dosimetry phantom (SRCT-P) with radiochromic film (RF) was developed. The dose distfributions 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 dose distribution 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 maximum-minimum doses and dose distribution of a CT examination can be measured separately by using the SRCT-P with RF.

Original languageEnglish
Pages (from-to)339-344
Number of pages6
JournalAustralasian Physical and Engineering Sciences in Medicine
Volume31
Issue number4
Publication statusPublished - Dec 2008

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Keywords

  • Computed tomography
  • Phantom
  • Radiation dosimetry
  • Radiochromic film

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

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