Commissioning of the TrueBeam STx 6 MV FFF Beam in the RayStation Treatment Planning System for SRS and SBRT Treatments

Purpose: The purpose of this study is to provide technical information on commissioning the TrueBeam STx 6 MV flattening-filter free (FFF) beam in RayStation treatment planning system (TPS) for stereotactic radiosurgery (SRS) and body radiation therapy (SBRT) treatments. Methods: For modeling, percent depth dose curves, profiles output factors jaw-collimated fields cones as well X-jaws transmission were measured. multi-leaf collimator (MLC) MLC model parameters such offset, gain, curvature, leaf tip width, tongue groove determined MLC-collimated Absolute calibration was also performed. validation, American Association Physicists Medicine Task Group-119 plans, clinical SRS SBRT plans end-to-end testing Results: Beam characteristics FFF agreed with those literature. Validation results showed that our acceptable Conclusions: dosimetric data provided will be a useful reference other clinics/institutions which commission same machine energy TPS.