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Random Errors Only: M
rand
=0.7
s
▪
The CTV experiences daily shifts of the dose distribution due to daily random
variations in the position of the CTV
▪
If we add the daily shifted dose distributions the dose distribution appeares
to be blurred (motion blurring)
▪
The effect of the random error can be calculated by convolving the random
error distribution with the dose distribution => blurred dose distribution
=
random error
s