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Do the representative beam data for TrueBeam™ linear accelerators represent average data?

Yoshihiro Tanaka1, Hirokazu Mizuno2, Yuichi Akino3

  • 1Department of Radiation Therapy, Japanese Red Cross Society Kyoto Daiichi Hospital, Kyoto-shi, Kyoto, Japan.

Journal of Applied Clinical Medical Physics
|January 14, 2019
PubMed
Summary
This summary is machine-generated.

Intermachine variability in TrueBeam linear accelerator beam data is minimal, supporting the clinical use of vendor-provided representative beam data (RBD). Small field dosimetry showed some variation, but overall, RBDs facilitate efficient linear accelerator installation.

Keywords:
commissioninglinear acceleratorrepresentative beam data

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Equipment

Background:

  • Accurate beam modeling for TrueBeam linear accelerators is crucial for clinical practice.
  • Previous studies on TrueBeam machine data variation analyzed a limited number of machines.
  • Vendor's Representative Beam Data (RBD) requires validation for clinical use.

Purpose of the Study:

  • To investigate the intermachine variability of TrueBeam linear accelerator beam data.
  • To assess the suitability of vendor's RBD for clinical applications.
  • To identify potential discrepancies in beam data across multiple institutions.

Main Methods:

  • Collected and analyzed beam data from 21 TrueBeam machines across 17 institutions.
  • Evaluated percent depth dose (PDD), off-center ratio (OCR), and output factor (OPF) variations.
  • Compared machine-specific data against study averages and vendor's RBD.

Main Results:

  • PDD and OCR values showed <1% variation across all photon energies.
  • Dose difference (DD) in field regions was <1% for field sizes ≥100x100 mm².
  • Output factor (OPF) values exhibited <1% variation for all energies and field sizes.
  • Large OCR variations (≥2%) were observed for 30x30 mm² fields.

Conclusions:

  • TrueBeam linear accelerators demonstrate very small intermachine variability, supporting the use of vendor's RBD.
  • Vendor's RBDs can significantly expedite the installation of new linear accelerators.
  • Small field dosimetry requires careful consideration due to observed variations.