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Purpose
: delineation of tumor (
→
PTV) and calculation of dose
Goal
: reproducible positioning of patient at simulation & treatment
and during treatment
→ knee support
→ markers (skin)
→ fixation masks
→ …
Potential errors/challenges
:
• set up error on scanner
• movement during scan (patient or tumor)
• metal
• ….
Treatment preparation – planning CT
→
margins!