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Model-based dose calculations for (125)I lung brachytherapy.

J G H Sutherland1, K M Furutani, Y I Garces

  • 1Department of Physics, Carleton University, Ottawa, Ontario K1S 5B6, Canada. jsuther@physics.carleton.ca

Medical Physics
|July 27, 2012
PubMed
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Accurate lung brachytherapy requires metallic artifact correction for dose calculations. Different tissue assignments and TG-43 methods significantly impact dose distributions, necessitating careful implementation.

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Physics

Background:

  • Intraoperative (125)I lung brachytherapy utilizes model-based dose calculations (MBDCs) with patient CT data.
  • Metallic artifacts from brachytherapy seeds complicate accurate dose distribution analysis.
  • Standard TG-43 protocols may not fully account for complex patient-specific factors.

Purpose of the Study:

  • To evaluate the impact of metallic artifact correction and tissue assignment schemes on MBDCs for lung brachytherapy.
  • To compare MBDCs with traditional TG-43 dose calculations.
  • To identify optimal methods for accurate dose assessment in lung brachytherapy.

Main Methods:

  • MBDCs were performed using EGSnrc BrachyDose on CT-derived phantoms from six patients.

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  • Four metallic artifact correction methods and three tissue assignment schemes were applied.
  • Dose distributions were compared between corrected and uncorrected phantoms, and against TG-43 calculations.

    • Main Results:

    • Metallic artifact correction significantly altered dose distributions (up to 40% for D(90)).
    • Simpler artifact correction methods (threshold replacement) showed good agreement for clinical dose metrics.
    • TG-43 calculations underestimated dose in healthy lung tissue compared to MBDCs (up to 36% for D(90)).

    Conclusions:

    • Metallic artifact correction is crucial for accurate MBDCs in lung brachytherapy.
    • Careful tissue parameter determination and assignment are essential for precise dose calculations.
    • MBDCs provide a more accurate dose assessment than TG-43, especially in heterogeneous lung tissue.