Microsoft Word - Scientific Program IGRT 2016 Madrid V3

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Analysis of motion
(random and systematic errors)
mean =M
RMS = s
SD = S
Intra-fraction
0.0
0.3
0.4
0.1
0.3
_________
Mean = 0.2
RMS of SD
= sf
patient 1 patient 2 patient 3 patient 4
fraction 1 0.5 0.0 0.2 0.7
fraction 2 0.6 -0.5 0.3 0.2
fraction 3 0.9 0.2 0.2 -0.4
fraction 4 1.3 -1.1 0.3 -0.1
mean 0.8 -0.4 0.3 0.1
sd 0.3 0.6 0.1 0.5
van Herk et al, Sem Rad Onc 2004
M = group systematic error (equipment)
S = standard deviation of the systematic (preparation) error
s = standard deviation of the random (execution) error
sf = standard deviation of the intra-fraction motion {