SU-E-T-200: IMRT Patient Specific QA for On-Line Adaptive Radiotherapy

Medical Physics
Z GaoM Li

Abstract

On-line adaptive IMRT requires a highly efficient radiotherapy team and an intensive amount of work, as well as significant amount of Quality Assurance (QA). With regard to patient specific QA, it is clinically unrealistic to perform fluence measurements via a QA phantom while patient is setup awaiting treatment. We therefore developed an alternative way to check point dose and the IMRT fluence right before beam delivery. In this study, 28 IMRT plans were generated with Prowess Panther 5.1 for three prostate cancer patients on 28 CT datasets with CTV and critical organs contoured by treating physicians. The corresponding QA plans were generated by Prowess, and then transfered to Pinnacle 9.2 for fluence recalculation on a flat surface phantom, In addition 28 QA plans were delivered on a Siemens Artiste accelerator and fluence were measured with Matrixx IMRT Device. We analyzed both point dose and fluence for these 28 samples. Of all 28 IMRT plans, the point dose difference between Prowess and Pinnacle are well within 1%. The point dose difference between measurements and Prowess calculation are all within 3%. The passing rates using gamma criteria (3%3mm) for the fluence comparison between Prowess and Pinnacle calculation are a...Continue Reading

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