Clinically Relevant Quality Assurance for Intensity Modulated Radiotherapy Plans: Gamma Maps and DVH-Based Evaluation

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-ind...

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Bibliographic Details
Published in:Cancer investigation 2014-03, Vol.32 (3), p.85-91
Main Authors: Caivano, R., Califano, G., Fiorentino, A., Cozzolino, M., Oliviero, C., Pedicini, P., Clemente, S., Chiumento, C., Fusco, V.
Format: Article
Language:English
Subjects:
3D quality assurance
COMPASS system
Gamma Rays
Head and neck
Head and Neck Neoplasms - radiotherapy
Humans
IMRT
Quality Assurance, Health Care
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted - methods
Radiotherapy Planning, Computer-Assisted - standards
Radiotherapy, Intensity-Modulated - methods
Radiotherapy, Intensity-Modulated - standards
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Summary: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.
ISSN:0735-7907
1532-4192
DOI:10.3109/07357907.2013.877478