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Position-dependent corrections significantly improve accuracy for ring applicators in brachytherapy. Two methods effectively corrected source positioning errors, ensuring precise radiation delivery.

Keywords:
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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Brachytherapy

Background:

  • Ring applicators in brachytherapy can have significant positioning errors due to their design.
  • Standard global offset corrections may not meet required tolerances for these errors.

Purpose of the Study:

  • To investigate two methods for applicator reconstruction with position-dependent source offset corrections.
  • To assess the effectiveness of these methods in improving source positioning accuracy.

Main Methods:

  • Measurements using Varian Interstitial PEEK Ring 60° and BRAVOS afterloader.
  • Source positioning characterized via autoradiographs and planar kV images.
  • Two position-dependent correction methods: local radius modification and bidirectional source movement simulation.

Main Results:

  • Autoradiographs revealed quasi-linear dwell position offsets, up to 3 mm at the ring's end.
  • kV images confirmed effective radius 0.5 mm larger than nominal.
  • Both methods reduced residual positioning errors to a mean of 0.0 (±0.3) mm.

Conclusions:

  • Position-dependent source offset corrections successfully corrected applicator positioning errors.
  • The manufacturer-recommended method offered simpler implementation and broader applicability.
  • Accurate source positioning is crucial for effective brachytherapy treatment.