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Association between distance from the radiation source and radiation exposure: A phantom-based study.

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Summary

Increasing table height significantly reduces patient radiation exposure (measured entrance surface exposure). However, operator radiation exposure increases with table height, with shorter operators receiving higher doses.

Keywords:
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Area of Science:

  • Medical Imaging Physics
  • Radiation Safety
  • Radiological Protection

Background:

  • Medical radiation exposure poses risks, including increased cancer incidence.
  • Understanding factors influencing radiation dose is crucial for patient and operator safety.

Purpose of the Study:

  • To evaluate the relationship between distance from the X-ray source and radiation exposure.
  • To assess how varying table heights impact patient and operator radiation doses.

Main Methods:

  • Utilized an American National Standards Institute phantom to measure entrance surface exposure (MESE) at different X-ray source distances (table heights).
  • Recorded air-kerma and dose-area product measurements across three projections (PA, LAO, RAO).
  • Measured operator radiation exposure for short and tall operators at varying table heights.

Main Results:

  • MESE significantly decreased with increasing table height (p < .0005).
  • Operator radiation exposure significantly increased with increasing table height (p < .0005).
  • Shorter operators (150 cm) received higher radiation exposure than taller operators (190 cm) (p < .0005).

Conclusions:

  • Elevating the X-ray source-to-patient distance (increasing table height) effectively reduces patient radiation dose.
  • Conversely, increasing this distance elevates operator radiation exposure.
  • Operator height is a significant factor, with shorter individuals incurring greater exposure.