Advanced TP

Planning constraints

• For an uncommon (challenging) case, there may be no experience  Objective  If set too low allows computer (planner) to accept plan less good than is really possible  If set too high then effectively fail to guide the plan Constraint  If set too low, then drives the plan away from optimal solution  If this is a normal tissue constraint then typically drives down dose in PTV  If too high then may not protect normal tissue 