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Systematic set-up uncertainties

Same error in every fraction

Examples

Incorrect reconstruction procedures

(source path commissioning)

Systematic misinterpretation of images

CT

MR

Random set-up uncertainties

Different in every fraction

Visibility of applicator

(dependent on slice thickness)

Uncertainties of image fusion

Pronounced in longitudinal direction

(perpendicular to slice orientation)

Sagittal reconstruction

from para-transverse MR

Sagittal reconstruction

from transverse MR

© K. Tanderup

Hellebust et al

2007, PMB 52

Berger et al.

2009, R&O 93