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--- planning:userguide:tutorials:optimization_constraints [2016/08/17 12:52] – [About Constraints] dpatenaude
+++ planning:userguide:tutorials:optimization_constraints [2021/07/29 18:28] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-====== Defining Constraints ======
+<WRAP center round important 60%>
+This page is deprecated and now included in the [[planning:userguide:tutorials:finding_optimal_plan|Astroid Optimization (PBS)]] page
+</WRAP>
+====== Optimization Constraints ======
 ===== About Constraints =====
-//Constraints// can be set in multiple levels (//Plan, Fraction Group, Beam Set Group//) and they will function differently in each level. Note all constraints are considered "hard limits"- constraints that must be achieved. //Constraints// are what drive the feasibility calculation- whether the plan is achievable. //Constraints// at the //Plan// level are applied to the total dose across all beams.
+//Constraints// can be specified at various levels (//Plan, Fraction Group, Target/Beam Set//) with Astroid and they will affect different groups of beams depending on their level. //Constraints// at the //Plan// level are applied to the total dose resulting from all beams. //Constraints// at the //Fraction Group// level are applied to the total dose resulting from only the beams in the current Fraction Group. //Constraints// at the //Target/Beam Set// level are split evenly and applied individually to each Beam Set. In other words, the //Constraint// dose is divided by the number of //Beam Sets// in the //Target//, and this dose is then applied as a constraint to each Beam Set, so that either SFUD and IMPT can be achieved (see [[planning:userguide:tutorials:fraction_group|Fraction Groups]]). The section below will provide a walk through of the different levels and how constraints are applied at each one.
-//Constraints//  at the //Fraction Group// level apply to the total dose across all beams in the Fraction Group. Constraints at the //Beam Set Group// level are split evenly and applied individually to each Beam Set. In other words, the //Constraint// dose is divided by the //Beam Sets// in the //Beam Set Group//, so that both SFO  and IMPT can be achieved (see [[planning:userguide:tutorials:fraction_group|Fraction Groups]]). The following will provide a walk through of the different levels and how constraints work at each one.
+It should be noted that all constraints are considered "hard limits"- values that __must be__ achieved. //Constraints// drive the feasibility calculation- whether the plan is achievable and should be used to ensure certain minimal clinical parameters are met.
 The following constraint types are available. Note certain constraints are available only for //Target// type structures.
      * **Min**: The minimum dose the structure must receive
-     * **Max**: The maximum dose the structure must receive
+     * **Max**: The maximum dose the structure may receive
      * **Min Mean**: The minimum mean dose a structure must receive
       * This will drive the dose up across the structure
-     * **Max Mean**: The maximum mean dose a structure must receive
+     * **Max Mean**: The maximum mean dose a structure may receive
       * This will limit the mean dose across the structure
-     * The user can choose to apply one of these constraints or multiple constraints to the structure
+The user can choose to apply one or multiple of these constraints to any number of structure.
-==== Working with Constraints ====
+===== Working with Constraints =====
-=== Working with Fraction Group Constraints ===
+==== Working with Fraction Group and Target/Beam Set Constraints ====
-//Constraints//  at the //Fraction Group// level apply to the total dose across all beams in the //Fraction Group
-//
-  - Select the //Fraction Group// if it has been created or create a new //Fraction Group// <WRAP center>{{ :planning:userguide:tutorials:fraction_group_1.png?200 |}}</WRAP>
-  - Choose from the drop down the structure or structures to which constraints should be added
-  - Define what constraint(s) should be applied to each structure by choosing the constraint and entering the dose <WRAP center>{{ :planning:userguide:tutorials:fraction_group_constraint.png?200 |}}</WRAP>
-  - Once the constraints are set in the //Fraction Group// the user will create //Beam Set Groups// and assign //Constraints//
-  - The assigned constraint doses will be divided evenly among the //Beam Sets// in the //Beam Set Group// <WRAP center>{{ :planning:userguide:tutorials:fraction_group_beamset.png?200 |}}</WRAP>
-=== Working with Plan Constraints ===
-//Constraints// at the //Plan// level are applied to the total dose across all beams.
-  - Open the //Constraint// sub block contained in the //Plan Constraints/Objectives// block
-  - Choose from the drop down the structure or structures to which constraints should be added
-  - Define what constraint(s) should be applied to each structure by choosing the constraint and entering the dose  <WRAP center>{{ :planning:userguide:tutorials:optimization_plan_constraints.png?200 |}}</WRAP>
-Once all the Constraints have been set the user can either start the Feasibility or move on to defining the Objectives
+//Constraints// at the //Fraction Group// level are applied to the total dose resulting from only those beams in the current //Fraction Group//. //Constraints// at the //Target / Beam Set// level are equally split among the Beam Sets within the Target and are applied to the total dose resulting from the beams in each of the Beam Sets. The following steps are a brief walkthrough for creating a max constraint of 79.2 Gy(RBE) to the PTV for the whole Fraction Group, and then creating two SFO beams that each provide a minimum dose of 39.6 Gy(RBE). Note that this configuration with the max constraint at the Fraction Group Level is different than if we had put both the min and max at the Target / Beam Set level. In the case shown, it is only the total dose from the two beams that is constrained to be below 73 Gy(RBE). Had both constraints been placed at the Target Level, then each beam would instead be constrained to a max of 36.5 Gy(RBE).
+  - Select the //Fraction Group// if it has been created or create a new one by clicking //Create New Fraction Group//
+  - Choose the prescription, number of fractions to be treated with this Fraction Group
+  - Choose the type of treatment (SFO, IMPT, Advanced) and target {{ :planning:userguide:tutorials:fx_group_start.png?300 |}}
+  - Choose the //Beams// to be treated
+  - Choose the //Target// to be treated
+    - Assign the dose constraints to the //Target//
+    - The assigned constraint doses at this level will be divided evenly among the //Beams// to the //Target//, which allows for quick creation of SFO treatments {{ :planning:userguide:tutorials:fx_group_beams_and_target.png?300 |}}
+==== Working with Plan Constraints ====
+//Constraints// at the //Plan// level are applied to the total dose across all beams.
+  - Open the //Constraints// sub block contained in the //Constraints/Feasibility// block and choose the //Edit// button.
+  - Choose from the drop down the structure or structures to which constraints should be added
+  - Define what constraint(s) should be applied to each structure by choosing the constraint and entering the dose
+  - Follow this and enter the constraints for all applicable structures. {{ :planning:userguide:tutorials:constraints_2.png?300 |}}
+  - When finished click the //OK// button.
+  - Once all the Constraints have been set the user can either start the Feasibility by choosing //Calculate// or move on to defining the Objectives