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