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A new volumetric modulated arc therapy (VMAT) grid therapy planning method offers practical, efficient treatments. This approach effectively targets tumors while sparing organs at risk, leading to positive patient outcomes.

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Area of Science:

  • Radiation Oncology
  • Medical Physics

Background:

  • Volumetric Modulated Arc Therapy (VMAT) is a sophisticated radiation technique.
  • Grid therapy involves delivering radiation in a patterned, grid-like fashion.
  • Developing efficient VMAT planning for grid therapy is crucial for clinical application.

Purpose of the Study:

  • To present a novel and practical VMAT planning strategy for grid therapy.
  • To demonstrate the feasibility of this approach for complex tumor sites.

Main Methods:

  • Prescribing dose to spherical contours within the gross tumor volume (GTV).
  • Utilizing three concentric ring structures for dose optimization and OAR sparing.
  • Employing high-intensity flattening filter-free (FFF) modes for rapid treatment delivery.

Main Results:

  • Two patient cases (mediastinal mass, abdominal tumor) successfully treated with VMAT grid therapy.
  • Significant tumor size reduction and symptomatic relief observed in both patients.
  • No treatment-related complications reported, with treatments completed in 15-20 minutes.

Conclusions:

  • The described VMAT planning approach for grid therapy is clinically practical and efficient.
  • This method is particularly beneficial for tumors adjacent to critical structures.
  • The approach is widely accessible and can be implemented with established VMAT infrastructure.