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[CT based conformal brachytherapy treatment planning]

Tibor Major1, Csaba Polgár, László Mangel

  • 1Sugárterápiás Osztály, Országos Onkológiai Intézet, Budapest, H1122, Hungary. major@oncol.hu

Magyar Onkologia
|June 7, 2002
PubMed
Summary

Three-dimensional (3D) conformal brachytherapy planning using CT scans improves interstitial implant treatment. While it offers advantages in reconstruction and dosimetry, careful planning is needed to balance dose conformity and homogeneity for optimal outcomes.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy

Background:

  • Brachytherapy is a crucial radiotherapy technique.
  • Traditional treatment planning relies on X-ray film, limiting 3D visualization.
  • Advancements in imaging and planning systems enable more precise radiotherapy.

Purpose of the Study:

  • To introduce CT-based 3D conformal brachytherapy planning for interstitial implants.
  • To compare 3D planning with conventional X-ray film-based methods.
  • To highlight the advantages of 3D planning in reconstruction and dosimetry.

Main Methods:

  • CT scans (5 mm spacing) were acquired for 10 breast and 5 head and neck cancer patients.
  • Images were processed using the PLATO BPS v14.0 3D planning system.

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  • Target volumes, critical structures, and catheter positions were reconstructed in 3D for dose optimization.

    • Main Results:

    • 3D planning was applied to interstitial breast and head and neck implants.
    • Dose distribution was analyzed in axial, coronal, sagittal, and 3D views.
    • Dose volume histograms assessed target and critical structure doses, revealing potential dose inhomogeneity with conformal planning.

    Conclusions:

    • CT-based 3D brachytherapy planning is feasible in clinical practice.
    • A balance between dose conformity and homogeneity is essential for acceptable treatment plans.
    • Further research is needed to establish guidelines for optimal dose distribution parameters.