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Out-of-field dosimetry in VMAT for medulloblastoma using OSLDs.

Yassine Aguezzoumen1,2, Abdellatif Elanique1, Mohammed Reda Mesradi2

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Radiation Protection Dosimetry
|November 11, 2025
PubMed
Summary
This summary is machine-generated.

Volumetric modulated arc therapy for pediatric brain tumors increases secondary cancer risks due to higher low-dose exposure. Treatment planning system (TPS) dose predictions are inaccurate far from the radiation field, necessitating dosimetry verification.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Pediatric Oncology

Background:

  • Volumetric modulated arc therapy (VMAT) offers precise radiation delivery for pediatric medulloblastoma.
  • However, VMAT increases low-dose bath exposure to healthy tissues, potentially raising secondary cancer risks.

Purpose of the Study:

  • To evaluate the accuracy of treatment planning system (TPS) predictions for out-of-field dose (OOFD).
  • To assess the clinical implications of TPS OOFD underestimation in pediatric patients receiving VMAT.

Main Methods:

  • Measurements of OOFD were performed using optically stimulated luminescence dosemeters (OSLDs).
  • An anthropomorphic phantom was used to simulate pediatric patient anatomy and radiation exposure.
  • TPS OOFD predictions were compared against experimental dosimetry data.

Main Results:

  • TPS predictions showed high accuracy near the radiation field (within 3% at 5.5 cm).
  • Significant underestimation of OOFD was observed at greater distances, with discrepancies up to 64% (heart) and 16% (thyroid).
  • TPS models demonstrated limitations in predicting peripheral leakage and scatter radiation.

Conclusions:

  • Current TPS are inadequate for accurately predicting OOFD in pediatric patients undergoing VMAT.
  • OSLD-based dosimetry is crucial for verifying OOFD and assessing secondary cancer risks in this population.
  • Refining TPS algorithms and incorporating direct dosimetry are essential for improving long-term safety in pediatric radiation oncology.