Conclusion: With this method calculations inaccuracies caused by the high density materials are avoided. We recommend the discussion of the use of the technique proposed with the physician for each treatment of head and neck patient with dental prostheses. The techniques in this study are being developed currently for VMAT technique. EP-1699 10MV un-flattened photon beams in prostate and pelvic node VMAT SABR; is the high energy necessary? Purpose or Objective: To evaluate and compare the plan

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... uality and efficacy of flattened and flattening-filter-free (FFF) photon beams in external beam RT for high-risk prostate cancer patients in the context of hypo-fractionated Stereotactic Ablative Radiotherapy (SABR) to the prostate and pelvic lymph nodes (LN).