Dose distribution in pediatric CT head examination: Phantom study

R. Gotanda, T. Katsuda, T. Gotanda, A. Tabuchi, T. Kuwano, H. Yatake, K. Yabunaka, T. Akagawa, H. Sato, Y. Takeda

Research output: Contribution to journalArticlepeer-review

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 cylindrically-shaped by rolling up flexible acrylic sheets (1.1 g/cms). The dose distributions in the SRCTP (diameters of 6 cm [premature baby], 10 cm [neonates], and 14 cm [infants]) were evaluated. RFs were positioned every 5 mm along the radius at each SRCT-P, starting at center and ending on the surface. In this study, the absorbed dose and the dose distribution in the phantom were measured at 100 or 120 kV of the x-ray tube voltage. The other scanning parameters of the CT were 250 mA, 1.0 sec/rot, 1.25 x 8 mm slice thickness, and a 1.0 beam pitch. The mean center doses at 100 or 120 kV in 6, 10 and 14 cm of the SRCT-P were 37.0 or 64.2 mGy; 36.5 or 52.2 mGy; and 19.5 or 40.2 mGy, respectively. The mean surface doses in 100 or 120 kV at 6, 10 and 14 cm of the SRCTP were 33.9 or 57.9 mGy; 34.0 or 46.8 mGy; and 20.0 or 47.3 mGy, respectively. The absorbed dose was increased with a decrease in the phantom size. However, at 100 kV, the mean depth dose distributions at 6 or 10 cm of the SRCT-P were shown about the same value. The results indicated that the dose distribution in pediatric head CT becomes complex with patient head size and the tube voltage.

Original languageEnglish
Pages (from-to)547-550
Number of pages4
JournalIFMBE Proceedings
Volume37
DOIs
Publication statusPublished - Nov 9 2011

Keywords

  • computed tomography
  • pediatric
  • phantom
  • radiation dosimetry
  • radiochromic film

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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