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Related Experiment Videos

Improved treatment planning for COMS eye plaques.

Melvin A Astrahan1

  • 1Department of Radiation Oncology, University of Southern California Norris Cancer Hospital, 1441 Eastlake Avenue, Los Angeles, CA 90033, USA. astrahan@usc.edu

International Journal of Radiation Oncology, Biology, Physics
|March 9, 2005
PubMed
Summary

Accurate dosimetry for ocular melanoma treatment planning is improved by accounting for Silastic and gold plaque effects. This reduces calculated radiation doses to ocular structures, enhancing treatment precision.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Ophthalmology

Background:

  • The Collaborative Ocular Melanoma Study (COMS) medium tumor trial reanalysis highlighted dose calculation discrepancies.
  • Low-energy Iodine-125 radiation is absorbed via the photoelectric process, sensitive to material composition.
  • Standard brachytherapy dosimetry (AAPM TG43) assumes homogeneous water, neglecting plaque and carrier effects.

Purpose of the Study:

  • To develop and implement improved dose calculation factors for ophthalmic plaque dosimetry.
  • To account for attenuation in Silastic carriers and scatter deficits from gold plaques and air.
  • To assess the impact of these corrections on calculated doses for ocular structures.

Main Methods:

  • Modified an existing TG43-based ophthalmic plaque planning system.

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  • Incorporated scatter and attenuation correction factors for Silastic, gold, and air interfaces.
  • Evaluated dose distributions for Iodine-125 seeds in COMS plaques.

    • Main Results:

    • Dose-modifying effects of Silastic and gold are most pronounced near the plaque.
    • Calculated doses to ocular structures were 16%-50% lower than with standard COMS protocols.
    • Dose distribution results align with previous thermoluminescent dosimetry and Monte Carlo studies.

    Conclusions:

    • Accurate treatment planning for COMS eye plaques is feasible and practical.
    • Accounting for gold, Silastic, and extraocular air improves dose calculation accuracy.
    • Updated dosimetry parameters are crucial for precise ocular radiotherapy.