PurposeA commercial planning software using this technique, called Multiple Brain Mets SRS (MBM) Element from Brainlab AG (Feldkirchen, Germany), version 1.5, has been installed in our institution. It uses a preconfigured set of dynamic noncoplanar, conformal arcs to treat up to 15 brain-metastases with a single isocenter. It optimizes the weight of each arc to achieve the best conformity for all targets. Planning time for optimization and dose calculation is 2∼4 min, which improves the planning efficiency dramatically in our clinic. In this study we describe the method used in our clinic to measure the delivered dose and then compare to the calculated dose distribution. MethodsWe included in this study 10 patients whith multiple brain mets. For these 10 pz the number of lesions planned ranges from a minimum of two to a maximum of six. The verification plan is calculated by Brainlab Element for the QA and measured in Easycube phantom equipped with a CC01 ionization chamber and EBT film. Furthermore the comparison of the plans, computed by MBM Element and Varian Eclipse, version 13.0, is realised. ResultsThe percentage difference between calculated by MBM Element and measured is included in 5%.Treatment plans generated using MBM Element and Eclipse resulted in a good agreement, the difference of the maximun dose is lower 2%. The PTV mean dose values difference between MBM Element and Eclipse have resulted less 1,7%. ConclusionsSatisfactory absolute dose and distribution agreement were observed. We conclude that MBM Element was in clinical use after these validations.