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Varian HDR surface applicators - commissioning and clinical implementation.

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This study validated Varian surface applicators for brachytherapy, recommending a 4mm prescription depth and excluding the 10mm applicator for clinical use due to dosimetric challenges.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Brachytherapy

Background:

  • Varian surface applicators offer clinical advantages with varied apertures.
  • Steep dose gradients at 3-4 mm prescription depths pose implementation challenges.
  • Validation of dosimetric performance is crucial for clinical use.

Purpose of the Study:

  • To validate the dosimetric performance of Varian surface applicators with a vertically positioned source.
  • To develop procedures for the clinical implementation of these applicators.
  • To compare measurements with vendor data and Acuros algorithm calculations.

Main Methods:

  • Commissioning tests including functional integrity, physical dimensions, and dosimetric measurements.
  • Dose calculations using the Acuros algorithm for heterogeneity correction.
  • Measurements in solid water phantoms and air using ion chambers, Gafchromic films, and OSLDs.
  • Comparison of measured data with vendor specifications and Acuros predictions under different source positions.

Main Results:

  • All applicators met functional and physical dimension specifications.
  • Measurements for source position -15 mm showed good agreement (within 10% and 4%) with vendor data and (within 6% and 5%) with Acuros predictions.
  • Measurements for source position -10 mm, particularly with the 10 mm applicator, showed reduced agreement.
  • Dose profile widths and leakage dose measurements were consistent with predictions.

Conclusions:

  • Scenario (ii) (source at -15 mm) is recommended for treatment planning.
  • The 10 mm applicator is not recommended for clinical use.
  • A 4 mm prescription depth is advised for optimal dose coverage and sparing.