On using 3D γ-analysis for IMRT and VMAT pretreatment plan QA.
Publication/Presentation Date
6-1-2012
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.
Volume
39
Issue
6
First Page
3051
Last Page
3059
ISSN
0094-2405
Published In/Presented At
Wu C, Hosier KE, Beck KE, Radevic MB, Lehmann J, Zhang HH, Kroner A, Dutton SC, Rosenthal SA, Bareng JK, Logsdon MD, Asche DR. 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. PMID: 22755690.
Disciplines
Medicine and Health Sciences | Oncology
PubMedID
22755690
Department(s)
Department of Radiation Oncology
Document Type
Article