ESTRO 2021 Abstract Book

S1333

ESTRO 2021

Conclusion This study demonstrates excellent agreement between Ethos therapy systems and pre-configured beam model as well as minimal variation in Ethos therapy systems in terms of dosimetric and mechanical characteristics. Moreover, the results provide benchmark data for future Ethos therapy system installations. PO-1612 The relationship of MU density and gamma passing rate in patient-specific QA using EPID and Delta4 D. Li 1 , X. Li 2 , X. Zhen 2 , Z. Zhang 2 , Y. Wang 2 , Y. Liu 3 1 PeKing University ShenZhen Hospital, Radiotherapy Department, Shenzhen, China; 2 PeKing University