2017_IGRT course book

Dosimetric consequences of errors in frame-less SRS

1,0

0,8

0,6

0,4

0,2

0,0 D95 GTV dose compared to treatment plan

0,0

0,2

0,4

0,6

0,8

1,0

1,2

1,4

Pre-treatment 3D error (cm)

D95 of GTV

Planned

Pre T & R

Pre R

Post T & R

Av ± StDev

100% ± 0

78 ± 18%

99 ± 2% 100 ± 4%

Excellent dosimetric accuracy with frame-less SRS and correction of translations only