SBRT 2016

Table assisted rotation correction

Gevaert (and verellen) IJROBP 83, 2012 p467: Using Brainlab mask system, 40 pats Before and after IGRT on Novalis couch: Mean 3D: Before: M=1.91 mm ± 1.25 mm and after: M=0.58 mm ± 0.42 mm. Mean rotational errors: Before:

-0.10 ± 1.03 (vert), 0.23 ± 0.82 (long) and -0.09 ± 0.72 (lat) 0.01 ± 0.35 (vert),0.03 ± 0.31 (long) and 0.03 ± 0.33 (lat)

After:

(intrafraction, after approx 15 min)

A ≥0.5 ° rotation was identified as threshold for coverage loss. (Volume covered by prescription isodose would have decreased by 5% in this population)

Ohtakara R&O 102, 2012 p198: Brainlab vs standard mask: Both are suitable for 6DOF brain SBRT set-up, with standard mask requiring 0.5 mm larger margin