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Optimization of radiation therapy in nasopharyngeal carcinoma is particularly complex due to both the proximity of at risk organs and the high dose that has to be delivered. To obtain an optimal dose distribution, a knowledge-based optimization technique has been designed that associates an expert-system, named CAVCAV, with numeric optimization (gradient projection method). Based on clinical and...
Depuis novembre 1994, nous disposons d'un accelerateur Philips SL 15 equipe d'un collimateur a 80 lames. Du 1 er novembre 1994 au 31 aout 1995, 13 103 champs photons ete lectrons ont ete traites par cet accelerateur, dont 11 504 champs photons. Le taux d'utilisation du MLC pour champs complexes est en moyenne de 53% (de 50 a 68%). Les caches plombes conventionnels sont necessaires...
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