EP-1531: Stereotactic radiosurgery dose quality assurance: a commercial plastic scintillation versus a diamond detector

Abstract

A total of 15 patients plans and 79 DCA generated in iPlan RT Dose 4.1.2 (BrainLAB, AG, Germany), with a Pencil Beam algorithm using a kernel resolution of 2.5mm were tested. Mean equivalent MLC field size was of 16.6 mm (range 7.5-32.7mm). Plans were delivered on a Novalis TX, using the 6XSRS energy mode with a D/R of 1000 MU/min and a HDMLC multileaf collimator (2.5 mm leaf size at isocenter). Using a Lucy® 3D QA Phantom (Standard Imaging, Inc., USA), dose distributions were recalculated for each plan and Figure 2. In blue the Lucy phantom with the DD and in grey, bottom, with the PSD, position “tip down”. The water equivalence and absence of metal in the PSD resulted in no change in data for this detector. Both DD and PSD results were within the overall measurements accuracy. Analysis of the measurements performed with the detectors tip up and down, Fig.3, are shown below in Table 3.