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SU-E-T-456: Potential Optimization of Stereotactic Body Radation Therapy (SBRT) from a Simple Field Timing

J Schmitt1, G Warren1, I Wang1

  • 1Roswell Park Cancer Institute, Buffalo, NY.

Medical Physics
|May 19, 2017
PubMed
Summary

Optimizing Stereotactic Body Radiation Therapy (SBRT) field timing by arranging beams in a central triangle pattern significantly enhances cell kill. This approach improves radiation effectiveness compared to standard clinical delivery methods.

Keywords:
Biomedical modelingCancerDosimetryLungsOptimizationRadiation therapyRadiation treatmentTherapeutics

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Area of Science:

  • Radiation oncology
  • Medical physics
  • Radiobiology

Background:

  • Stereotactic Body Radiation Therapy (SBRT) involves high-dose, fractionated radiation delivery.
  • Treatment protraction and field timing can influence SBRT's radiobiological outcomes.
  • Optimizing beam arrangement is crucial for maximizing therapeutic effects.

Purpose of the Study:

  • To investigate the impact of field delivery timing on radiobiological results in SBRT.
  • To optimize SBRT field arrangements using protraction factor and cell survival models.
  • To compare optimized field timings against clinical delivery for non-small cell lung cancer models.

Main Methods:

  • Utilized protraction factor (G-value), LPL, and LQL models to optimize SBRT field arrangements.
  • Analyzed eight SBRT patient treatments, comparing clinical (C) to optimized (O) and least favorable (V) timings.
  • Employed survival fraction (SF) data from H460, H660, and H157 non-small cell lung cancer cell lines.

Main Results:

  • Optimal field arrangement consistently emerged as a central triangle pattern across all models.
  • Triangle field arrangements demonstrated lower cell survival fractions compared to clinical and V-shaped patterns.
  • For H460 cells, the triangle pattern was approximately 6 times more effective than the clinical plan after 3 fractions.

Conclusions:

  • Rearranging SBRT field timing to centralize maximal dose deposition can optimize cell kill.
  • Strategic field arrangement holds potential to significantly improve SBRT treatment outcomes.
  • Further research into optimal beam sequencing is warranted for enhanced SBRT efficacy.