123 / 1542
10
-5
0
5
10
15
0
5
15
20
25
30
35
:
after NAL a priori setup correction
AP displacements (mm)
Prostate cancer patient
Fraction
:
initial set-up on
(
original
)
tattoos (prior to NAL correction)
Residual systematic error
with NAL
No NAL
Mechanism of NAL
NO REDUCTION OF RANDOM ERROR
f>3, no imaging, correct
f
3, image, do not correct