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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
±
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.
Hyde IJROBP 82, 2012 e555
intrafractional imaging and corrections needed approximately every 15 to 20 min.
31