SU-E-T-633: To Evaluate Dosemetric Differences of IMRT Lung Plans Generated from RayStation Multi-Criteria Optimization (MCO) and Pinnacle Direct Machine Parameters Optimization (DMPO)

Medical Physics
Y ChenC Yang

Abstract

To evaluate dosimetric differences of IMRT lung plans generated from RayStation× Multi-Criteria Optimization (MCO) and Pinnacle Direct Machine Parameters Optimization (DMPO) Methods: Five patients previously treated with plans from Pinnacle v9.0 using DMPO algorithm were re-planned on RayStation v2.4.8.180 using MCO Pareto plans with same dose constraints, beam angles and objectives. The prescription was 60 Gy to 95% of PTV. Planning outcomes such as D95 (95% of volume receiving the prescribed dose), D2, D1 for PTV, D33 and mean dose for heart, V20 (volume receives at least 20 Gy) and mean dose for lung, max dose for cord were reported for evaluation according to our clinical protocols. The conformity of the prescription isodose volume to PTV was evaluated as conformity index (CI). Planning time was also observed. The mean volume of PTV was 356 ± 141 cm(3) . The D95 of PTV with RayStation was improved and more uniform compared to plans from Pinnacle (59.4 ± 0.2 vs. 59.2 ± 0.8 Gy), respectively. D2 and D1 of PTV were lower with RayStation plans. Mean dose and V20 of total lung were lower for all RayStation plans with max dose of cord, and D33 and mean dose of heart following the same trend. CI was better with RayStation compared...Continue Reading

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