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Area of Science:

  • Medical Physics
  • Radiological Sciences

Background:

  • Automatic exposure control (AEC) in computed tomography (CT) optimizes patient radiation dose.
  • Patient centring within the CT gantry is essential for AEC effectiveness.
  • Off-centre positioning can compromise image quality and radiation dose distribution.

Purpose of the Study:

  • To experimentally measure organ and abdominal surface dose variations during CT examinations.
  • To compare radiation doses at the isocenter versus ventral and dorsal off-centre positions.
  • To assess the impact of patient positioning on dose optimization in CT.

Main Methods:

  • Utilized an anthropomorphic adult phantom for dose measurements.
  • Employed thermoluminescent dosemeters to quantify radiation dose.
  • Measured dose at the isocenter and at +3 cm (ventral) and -5 cm (dorsal) off-centre positions.

Main Results:

  • Ventral off-centre positioning (+3 cm) reduced organ and surface doses by 5.6-39.0%.
  • Dorsal off-centre positioning (-5 cm) reduced organ and surface doses by 5.0-21.0%.
  • Dose reductions were observed for various anatomical regions including head, neck/thorax, and abdomen.

Conclusions:

  • Accurate vertical patient positioning at the gantry isocenter is critical.
  • Proper centring ensures optimal imaging conditions and effective dose management with AEC.
  • Deviations from the isocenter significantly impact organ and surface radiation doses.