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An expression for backscatter factors for orthovoltage x-rays

Y Xiao1, B Bjärngard

  • 1Department of Radiation Oncology, University of Pennsylvania, Philadelphia 19104-4283, USA. xiao@xrt.upenn.edu

Physics in Medicine and Biology
|June 12, 1998
PubMed
Summary

A new formula accurately predicts backscatter factors for orthovoltage x-ray beams, achieving over 99.5% accuracy. This model also shows promise for certain gamma-ray sources but is less effective for peak scatter factors at high x-ray energies.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiological Physics

Background:

  • Accurate calculation of backscatter factors (BSF) is crucial for radiation dosimetry.
  • Orthovoltage x-ray beams and gamma-ray sources (Cs-137, Co-60) are commonly used in radiotherapy and diagnostic imaging.
  • Existing models may have limitations in predicting scatter factors across different radiation energies and beam types.

Purpose of the Study:

  • To develop and validate a simple, accurate empirical expression for backscatter factors.
  • To assess the applicability of this expression to different radiation sources and depths.
  • To identify the limitations of the proposed model.

Main Methods:

  • Fitting the backscatter factor (BSF) using the expression BSF = 1 + ms/(s + n).

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  • s represents the field size, and m and n are adjustable parameters.
  • Validation was performed using data for orthovoltage x-ray beams, Cs-137 gamma rays, and Co-60 gamma rays.

    • Main Results:

    • The proposed expression achieved an accuracy better than 0.5% for orthovoltage x-ray beams.
    • Good agreement was observed for Cs-137 gamma rays at 0.12 cm depth and Co-60 gamma rays at 0.5 cm depth.
    • The expression was found to be inadequate for peak scatter factors at high x-ray energies.

    Conclusions:

    • The empirical formula BSF = 1 + ms/(s + n) provides a highly accurate method for calculating backscatter factors for orthovoltage x-ray beams.
    • The model demonstrates potential utility for specific gamma-ray applications but requires further refinement for high-energy x-ray peak scatter factors.