Folie 1

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)

After:

0.01

0.35 (vert),0.03

0.31 (long) and 0.03

0.33 (lat)

(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