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In this work we present the output factor measurements of a clinical linear accelerator using a silicon strip detector coupled to a new system for complex radiation therapy treatment verification. The objective of these measurements is to validate the system we built for treatment verification. The measurements were performed at the Virgin Macarena University Hospital in Seville. Irradiations were carried out with a Siemens ONCOR (TM) linac used to deliver radiotherapy treatment for cancer patients. The linac was operating in 6 MV photon mode; the different sizes of the fields were defined with the collimation system provided within the accelerator head. The output factor was measured with the silicon strip detector in two different layouts using two phantoms. In the first, the active area of the detector was placed perpendicular to the beam axis. In the second, the innovation consisted of a cylindrical phantom where the detector was placed in an axial plane with respect to the beam. The measured data were compared with data given by a commercial treatment planning system. Results were shown to be in a very good agreement between the compared set of data.EU Initial Training Marie Curie Network PITN-GA-2008-215080Spanish Research Projects FPA2009-08848 FPA2008-04972-C03-02government of Andalusia Research PO7-FQM02894Consolider-Ingenio CSD2007-00042Instalaciones Inabensa S.A. 68/83 0214/012

Output factor determination for dose measurements in axial and perpendicular planes using a silicon strip detector