Phantom Positioning Variation in the Gamma Knife? Perfexion Dosimetry

8th Brazilian Congress on Metrology

Costa, N.A.^1 ; Potiens, M.P.A.^1 ; Saraiva, C.W.C.^2

Instituto de Pesquisas Energéticas e Nucleares, IPEN-SP, Comissão Nacional de Energia Nuclear, CNEN, São Paulo

SP, Brazil^1

Hospital Do Coração, São Paulo

SP, Brazil^2

关键词: Gamma knife;    Radiation field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/733/1/012098/pdf
DOI  :  10.1088/1742-6596/733/1/012098

来源: IOP

【 摘 要 】

The use of small volume ionization chamber has become required for the dosimetry of equipments that use small radiation fields such as the Gamma Knife® Perfexion (GKP) unit. In this work, a pinpoint ionization chamber was inserted into the dosimetry phantom and measurements were performed with the phantom in different positions, in order to verify if the change in the phantom positioning affects the dosimetry of the GKP. Four different phantom positions were performed. The variation in the result is within the range allowed for the dosimetry of a GKP equipment.