[Development of external quality control protocol for CyberKnife beams dosimetry: preliminary tests multicentre].
Fiche publication
Date publication
juillet 2013
Auteurs
Membres identifiés du Cancéropôle Est :
Pr PEIFFERT Didier
Tous les auteurs :
Guinement L, Marchesi V, Veres A, Lacornerie T, Buchheit I, Peiffert D
Lien Pubmed
Résumé
PURPOSE: To develop an external quality control procedure for CyberKnife((R)) beams. This work conducted in Nancy, has included a test protocol initially drawn by the medical physicist of Nancy and Lille in collaboration with Equal-Estro Laboratory. MATERIALS AND METHODS: A head and neck anthropomorphic phantom and a water-equivalent homogeneous cubic plastic test-object, so-called "MiniCube", have been used. Powder and solid thermoluminescent dosimeters as well as radiochromic films have been used to perform absolute and relative dose studies, respectively. The comparison between doses calculated by Multiplan treatment planning system and measured doses have been studied in absolute dose. The dose distributions measured with films and treatment planning system calculations have been compared via the gamma function, configured with different tolerance criteria. RESULTS: This work allowed, via solid thermoluminescent dosimeter measurements, verifying the beam reliability with a reproducibility of 1.7 %. The absolute dose measured in the phantom irradiated by the seven participating centres has shown an error inferior to the standard tolerance limits (+/- 5 %), for most of participating centres. The relative dose measurements performed at Nancy and by the Equal-Estro laboratory allowed defining the most adequate parameters for gamma index (5 %/2mm--with at least 95 % of pixels satisfying acceptability criteria: gamma
Référence
Cancer Radiother. 2013 Jul-Aug;17(4):288-96