On using 3D γ-analysis for IMRT and VMAT pretreatment plan QA

Med Phys. 2012 Jun;39(6):3051-9. doi: 10.1118/1.4711755.

Abstract

Purpose: To investigate using 3D γ analysis for IMRT and VMAT QA.

Methods: We explored and studied 3D γ-analysis by comparing TPS computed and EPID back-projection reconstructed doses in patient's CT images. Two 3D γ quantities, γ(PTV) and γ(10), were proposed and studied for evaluating the QA results, and compared to 2D γ (MapCheck composite: γ(MC)).

Results: It was found that when 3%(global)/3 mm criteria was used, all IMRT and 90% of VMAT plans passed QA with a γ pass rate ≥90%. A significant statistical correlation was observed between 3D and 2D γ-analysis results for IMRT QA if γ(10) and γ(MC) are concerned, but no significant relation is found between γ(PTV) and γ(MC).

Conclusions: 3D γ analysis based on EPID dose back-projection may provide a feasible tool for IMRT and VMAT pretreatment plan QA.

MeSH terms

  • Gamma Rays*
  • Humans
  • Imaging, Three-Dimensional / methods*
  • Male
  • Prostatic Neoplasms / radiotherapy
  • Quality Control
  • Radiotherapy Planning, Computer-Assisted / methods*
  • Radiotherapy Planning, Computer-Assisted / standards
  • Radiotherapy, Intensity-Modulated / methods*
  • Radiotherapy, Intensity-Modulated / standards
  • Software