| Autor: |
Wu, Chuan, Hosier, Kelly E., Beck, Kristen E., Radevic, Marlyn B., Lehmann, Joerg, Zhang, Hao H., Kroner, Aaron, Dutton, Sharon C., Rosenthal, Seth A., Bareng, Jonathan K., Logsdon, Mark D., Asche, David R. |
| Předmět: |
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| Zdroj: |
Medical Physics; Jun2012, Vol. 39 Issue 6, p3051-3059, 9p |
| Abstrakt: |
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, γPTV and γ10, were proposed and studied for evaluating the QA results, and compared to 2D γ (MapCheck composite: γMC). 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 γ10 and γMC are concerned, but no significant relation is found between γPTV and γMC. Conclusions: 3D γ analysis based on EPID dose back-projection may provide a feasible tool for IMRT and VMAT pretreatment plan QA. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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