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At the start of treatment

Single CT introduces systematic

errors*:

Delineation errors

Organ position and shape at time of

localization

Phantom transfer errors

o

Geometric imaging error

o

Treatment planning system error

o

Linear accelerator geometry error

o

Set-up error at time of localization

TPS beam algorithm error

Breathing positional error

*McKenzie et al., BIR 2003

Image courtesy: Marcel van Herk