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A beam profile generation algorithm for wedged half-beam blocked asymmetric fields

A E Millin1, C W Smith

  • 1Radiotherapy Physics Service, Velindre Hospital, Whitchurch, Cardiff, UK.

Physics in Medicine and Biology
|January 1, 1994
PubMed
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This study introduces a fast method to predict radiation beam profiles for complex wedged asymmetric fields. The technique modifies existing symmetric field data, enabling accurate predictions with minimal extra information for treatment planning systems.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Physics

Background:

  • Accurate prediction of radiation beam profiles is crucial for effective cancer treatment planning.
  • Current methods for asymmetric and wedged fields in radiotherapy planning systems can be data-intensive and time-consuming.
  • Independent collimator jaws allow for complex field shaping, necessitating advanced profile prediction methods.

Purpose of the Study:

  • To develop and validate a computationally efficient method for predicting beam profiles and outputs for wedged asymmetric fields.
  • To reduce the data requirements for generating accurate dose distributions in radiotherapy.
  • To improve the speed and accuracy of treatment planning for complex beam geometries.

Main Methods:

  • A novel method utilizing modified primary off-centre ratios (POCRS) derived from in-air measurements of wedged fields.

Related Experiment Videos

  • Incorporation of beam hardening effects using measured attenuation coefficients under each wedge for accurate POCR generation at depth.
  • Comparison of calculated beam profiles against measured data across various asymmetric field configurations, including penumbra regions.

    • Main Results:

    • The proposed method allows for rapid generation of beam profiles for wedged asymmetric fields.
    • Favorable agreement was demonstrated between calculated and measured beam profiles across the entire asymmetric field, including the penumbra.
    • The technique requires minimal additional data beyond what is typically used in standard treatment planning systems.

    Conclusions:

    • The presented method offers a fast and accurate approach for predicting beam profiles in wedged asymmetric fields.
    • This technique can be readily integrated into existing treatment planning systems, enhancing efficiency.
    • The findings support the use of this method for improved radiotherapy treatment planning and delivery.