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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