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Plan Library vs. Online Re-Planning
Plan library
Online re-planning
Does not require full segmentation of target
volumes and organs at risk
Requires full segmentation (and approval) of
target volumes and organs at risk
No time is lost by online (re)optimization of the
plan of the day
If (re)optimization time is too long intra-fractional
motion will limit the precision of online adaptive
approaches
Plan library approaches can be incorporated in
existing radiotherapy workflows
Daily (re)optimization requires a completely new
workflow
Plans stored in the plan library can be QA’d in
advance
(Re)optimized plans should be QA’d on the fly
A-priori generated treatment plans do not
necessarily accommodate all anatomies
Full (re)optimization will provide the most tight-
fitting treatment plan
Tumor shrinkage is difficult to model a-priori and
is therefore hard to incorporate in plan libraries
(Re)optimization can incorporate tumor
shrinkage, but is it safe?