SBRT2015

ESTRO SBRT course Sept 2015

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

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.

Hyde IJROBP 82, 2012 e555

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