2017_SBRT_Course Book

Positioning for spine SBRT Before IGRT: (a) M:-0.4 to 1.5, SD of 2-3 mm (b) and (c) M: of -6.2 to 0.8, SD of 4-7 mm

After IGRT: SD of 0.6 to 0.9 mm and 0.9 ° to 1.6 °

Thus: IGRT resolves initial differences in set-up accuracy However: Mean localisation to post treatment CBCT time 34 ± 7 min 6% of all fractions were within the tolerance (2mm) on localization CBCTs.

97% directly after IGRT 93% at mid-treatment, 82% at post-treatment. Try to reduce treatment time!

Li IJROBP 84, 2012 p520