Clinical and theoretical quasi-IMAT study of prostate cancer to show high plan quality with a single arc

TL;DRAbstract

Purpose: Commonly IMAT treatment plans for clinical use can only be generated by forward planning. We present a quasi-IMAT technique, simulated by step-and-shoot treatment. The purpose of this study is to investigate, if the plan quality can be improved by increasing the number of beams, keeping the number of segments constant. Materials and Methods: Quasi-IMAT plans with 18 and 36 equidistant beams were generated and the total number of segments was reduced to 36. In a second step the number of segments was increased to 72, in order to investigate if the quality of the plans as determined by DVHs of PTV and OAR improves with the number of segments. A conventional six-field IMRT plan was used as a reference. The beam setups were applied to the Carpet Phantom and to five prostate cancer patients. The plans were optimized with Oncentra Masterplan (version 3.0, DSS) for 15 MV photons and a MLC with 1 cm leaf width at isocenter. After optimization plans were normalized to the average of th

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