Dose estimations for Iranian 11-year-old pediatric phantoms undergoing computed tomography examinations

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Parisa Akhlaghi1, Hashem Miri-Hakimabad2, Laleh Rafat-Motavalli1

  • 1Physics Department, Faculty of Science, Ferdowsi University of Mashhad, Azadi Square, Mashhad, 91775-1436, Iran.

Journal of Radiation Research
|May 15, 2015
PubMed

Insights

This study developed organ dose databases for Iranian children undergoing CT scans. Iranian phantoms received higher radiation doses than the University of Florida phantom, highlighting anatomical differences.

Area of Science:

  • Medical Physics
  • Radiological Protection
  • Pediatric Imaging

Background:

  • Establishing organ and effective dose databases for pediatric computed tomography (CT) is crucial for radiation protection.
  • Limited data exists for Iranian children undergoing CT examinations.
  • Utilizing anthropomorphic phantoms is a standard method for dose assessment.

Purpose of the Study:

  • To create an organ and effective dose database for Iranian children undergoing CT scans.
  • To compare radiation doses received by Iranian pediatric phantoms with established international phantoms.
  • To investigate the impact of anatomical differences on organ dose distribution.

Main Methods:

  • Construction of two 11-year-old Iranian phantoms using CT and MRI data.
  • Calculation of organ and effective doses for head, chest, abdomen-pelvis, and CAP scans at varying tube voltages (80, 100, 120 kVp).
  • Comparison of dose data with the University of Florida (UF) 11-year-old male phantom, including analysis of organ depth and surrounding tissue shielding.

Main Results:

  • Iranian phantoms generally received higher organ doses compared to the UF phantom.
  • Exceptions were noted, such as the urinary bladder dose in the Iranian girl phantom.
  • Discrepancies in doses were examined and attributed to anatomical variations between the phantoms.

Conclusions:

  • Significant differences in organ doses exist between Iranian and UF pediatric phantoms, emphasizing the need for region-specific dose databases.
  • Anatomical variations play a key role in determining radiation dose distribution in pediatric CT.
  • The findings provide essential data for optimizing radiation protection protocols for children in Iran.

Keywords:
Iranian 11-year-old phantomMonte Carlo simulationcomputed tomographydose estimationorgan depth distribution

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