Folie 1

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.