ESTRO 2021 Abstract Book

S884

ESTRO 2021

treatment planning was performed on computer based treatment planning system (TPS), Eclipse (V 11.0, Varian Medical Systems, Palo Alto, CA) used analytical anisotropic algorithms (V11.0.31). Treatment was planned using multiple coplanar volumetric modulated radiotherapy arcs for Trilogy‐5823 using 6 megavolt (MV) photons. No specific critical structure constraints were given except V 12Gy of brain outside target volume

<10 cc. Results

Table 1 lists the target volumes and various target and organ at risk dosimetric parameters. We observed that all optic structures and hippocampus receive maximum mean dose with temporal tumors and minimum with occipital tumors (p<0.05) when no specific dose constraints are applied. Results of TLD dosimetry would be reported later.

TABLE 1: Target volumes and critical structure dosimetric parameters based on location of radiosurgery