Dose Course 2018_Flipping book

15

Oncentra/Monaco – Pencil beam and Collapsed Cone Convolution

❑ Patient tissue distribution is represented by a 3D density matrix where the properties in each voxel are either derived from pixel values in a CT image or from user specified values of mass or electron density. ❑ It is assumed that the specified density values correspond to tissue material of “standard” compositions (see ICRP 23 and ICRU 44). ❑ The Hounsfield number assigned to each standard tissue is mapped from the calculated electron density using relations given by Knöös et al [38].

❑ …for charged particle equilibrium conditions CC calculates dose to medium while PK calculates dose to a large water cavity in medium. Both algorithms consider attenuation of the beam as per medium thus; ❑ Pencil kernel and for point kernel

,

,

Previously TMS-Helax, Oncentra MasterPlan

Dublin 2018