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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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SU-E-T-567: Improve Dose Conformity with IMRT Using Shorter Source to Tumor Distance.

W Yang1, H Sandler1, B Fraass1

  • 1Cedars-Sinai Medical Center, Los Angeles, CA.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

Reducing treatment distance with linear accelerators (LINACs) improves radiation dose conformity for brain radiotherapy. This novel technique minimizes high doses outside the planning target volume (PTV), potentially reducing late toxicity.

Keywords:
AnatomyBrainCancerDosimetryIntensity modulated radiation therapyLinear acceleratorsMultileaf collimatorsRadiation therapyRadiotherapy sourcesSelected area electron diffraction

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Planning

Background:

  • Late toxicity, including tissue necrosis and cognitive impairment, is a concern in brain radiotherapy.
  • Improving radiation dose conformity is crucial for minimizing damage to healthy brain tissue.

Purpose of the Study:

  • To investigate a novel planning technique using variable source-to-tumor distances (SADs) on linear accelerators (LINACs).
  • To enhance radiation dose conformity and reduce high doses delivered outside the planning target volume (PTV) for brain radiotherapy.

Main Methods:

  • Feasibility study on brain CT datasets with single and multiple lesions of varying volumes.
  • Creation of 5-field intensity-modulated radiation therapy (IMRT) plans using SADs of 100 cm, 80 cm, and 65 cm.
  • Quantification of dose spillage using R50 (50% isodose volume to PTV ratio) and V12 (volume receiving ≥12 Gy).

Main Results:

  • Shorter SADs consistently reduced R50, with average reductions of 13% (80 cm SAD) and 19% (65 cm SAD) compared to 100 cm SAD.
  • Improved dose conformity was more pronounced for smaller and multiple lesions.
  • Significant decreases in V12 were observed with shorter SADs.

Conclusions:

  • Reducing treatment distance for IMRT fields on existing LINACs enhances dose conformity.
  • Sharper beam penumbra and smaller multi-leaf collimator (MLC) leaf width contribute to improved conformity.
  • Precise delivery of non-isocentric beams is manageable on LINACs with advanced robotic gantry and couch capabilities.