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Pretreatment Spinal Column Dose Estimation for Spinal SBRT Using Octavius Four-dimensional Phantom and Dose-volume

Mallikarjuna Adavala1,2, K Chandrasekhar Reddy3, Shakambari Sadangi2

  • 1Department of Physics, Rayalaseema University, Kurnool, India.

Journal of Medical Physics
|January 15, 2024
PubMed
Summary

This study validates the PTW Octavius 4D system for estimating spinal cord dose in spinal Stereotactic Body Radiation Therapy (SBRT) plans before treatment. The system offers accurate, independent dose verification comparable to treatment planning systems.

Keywords:
Dose-volume histograms four-dimensionalEclipse treatment planning systemSBRTvolumetric modulated arc therapy

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Area of Science:

  • Medical Physics
  • Radiation Oncology

Background:

  • Spinal Stereotactic Body Radiation Therapy (SBRT) requires accurate dose estimation for critical organs like the spinal cord.
  • Pre-treatment dose verification is crucial for patient safety in SBRT.

Purpose of the Study:

  • To evaluate the PTW Octavius 4D system with its dose-volume histogram (DVH) 4D feature for estimating spinal cord dose in SBRT.
  • To compare the system's dose estimations with treatment planning system (TPS) calculations.

Main Methods:

  • Volumetric modulated arc therapy (VMAT) plans with 6MV flattening filter-free (6FFF) beams were generated for 23 patients using the Eclipse TPS with the Anisotropic Analytical Algorithm (AAA).
  • The PTW Octavius 4D system and phantom were used to measure the dose delivered by the VMAT plans.
  • Measured doses were compared against TPS calculated doses.

Main Results:

  • The Octavius 4D system's estimated spinal cord max and mean doses closely agreed with TPS calculations.
  • Deviations were ±5% for spinal max dose and ±3% for spinal mean dose between measured and TPS doses.

Conclusions:

  • The PTW Octavius 4D phantom and DVH 4D feature serve as a reliable tool for pre-treatment spinal cord dose estimation in SBRT.
  • This system provides independent and comparable dose measurements, validating its use for critical organ dose verification.