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Published on: October 6, 2023
Clinically relevant quality assurance for intensity modulated radiotherapy plans: gamma maps and DVH-based evaluation
R Caivano1, G Califano, A Fiorentino
1Radiation Oncology Department I.R.C.C.S., C.R.O.B. , Rionero in Vulture (Pz) , Italy.
Purpose:
To explore a novel patient-dose DVH-based method for pretreatment dose quality assurance tests.
Methods:
20 IMRT plans for head-and-neck cancer patients were used. A comparison was performed between the planned dose distributions, the computed, and the reconstructed ones using the gamma-index (GI) method. The GI analysis was performed using both the 3%/3 mm and the 2%/2 mm criteria.
Results:
No significant DVH-deviation was observed. Considering the 3%/3 mm criteria the mean GI% < 1 for the body and structures was significantly higher compared to 2%/2 mm criteria.
Conclusions:
Our results underline the importance of QA-methods based on DVH-metrics to predict the impact of delivered dose.
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