2017_SBRT_Course Book

Positioning for spine SBRT

BodyFIX and Hexapod 6DOF table, Elekta CBCT. (42 spine patients)

Small positioning errors after the initial CBCT setup were observed, with 90% within 1 mm and 97% within 1 ° (after 10 ± 3 min.). Only half of patients within tolerance (1 mm and 1 ° ) for the entire treatment (63 ± 4 min). With intra-fraction IGRT every 15-20 min and using a 1-mm and 1 correction threshold, the target was localized to within 1.2 mm and 0.9 ° with 95% confidence.

intrafractional imaging and corrections needed approximately every 15 to 20 min.

Hyde IJROBP 82, 2012 e555