(Sunday, 7/14/2019)
Room: ePoster Forums
Purpose: To analysis the dosimetric and delivery efficiency differences of IMRT plans based on Halcyon and Trilogy Accelerator for left side breast cancer.
Methods: A total of 10 patients with left side breast cancer based on the Trilogy platform were retrospectively analyzed. For each patient，plan based on Halcyon was redesigned using Eclipse Version 15.1 TPS. In order to evaluate plan quality, dose coverage of target and dose to organs at risk, monitor unit efficiency， segment size and delivery time were compared.
Results: Halcyon treatment platform can meet the clinical objectives. Dose distribution of the target volume has no significant difference with the Trilogy plans (P>0.05). Volumes receiving 5Gy�20Gy and Dmean of the left lung were significantly reduced(P<0.05) . V5 of heart for Halcyon and Trilogy were （27.80±7.66）% and（23.18±8.19）, respectively（P<0.05）, while Dmean （7.03±1.8）% and（7.11±2.40）, respectively（P<0.05）. Halcyon increased the monitor unit from 1770.5±383.9 by Trilogy to 1526.2±227.7（P<0.05）,while decreased the delivery time from 2.68±0.41min by Trilogy to 5.28±0.75min（P<0.05）.
Conclusion: Halcyon treatment platform can meet the clinical requirements, reduce the amount dose of normal tissue with high delivery efficiency.
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