[Intensity modulated radiation therapy: analysis of patient specific quality control results, experience of René-Gauducheau Centre]

Abstract

Purpose: Systematic verifications of patient's specific intensity-modulated radiation treatments are usually performed with absolute and relative measurements. The results constitute a database which allows the identification of potential systematic errors.

Material and methods: We analyzed 1270 beams distributed in 232 treatment plans. Step-and-shoot intensity-modulated radiation treatments were performed with a Clinac (6 and 23 MV) and sliding window intensity-modulated radiation treatments with a Novalis (6 MV).

Results: The distributions obtained do not show systematic error and all the control meet specified tolerances.

Conclusion: These results allow us to reduce controls specific patients for treatments performed under identical conditions (location, optimization and segmentation parameters of treatment planning system, etc.).