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planning:userguide:tutorials:fraction_group [2017/06/21 12:14] – [Fraction Group Targets] dpatenaudeplanning:userguide:tutorials:fraction_group [2021/07/29 18:28] (current) – external edit 127.0.0.1
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-====== Fraction Groups ======+====== PBS Fraction Groups ======
  
 Defining //Fraction Groups// is the first step in the PBS Optimization process within Astroid. Most commonly, a fraction group is simply an arrangement of beams that will be used in a typical daily treatment fraction. The Fraction Group contains some basic group information, as well as Fraction Group level constraints and collections of //Beam Sets// and //Constraints// for each target of the fraction group. The //Beam Set// and various //Constraint// levels are key concepts within Astroid that allow for high levels of control over the Astroid PBS Optimization engine. Further details of these critical items are provided below and additionally, examples of some common cases and how fraction groups, targets, and beam sets can be constructed to meet the clinical needs of various clinical cases can be found in the [[planning:userguide:walkthroughs:prostate_plan|Prostate Plan Walkthrough]]. Defining //Fraction Groups// is the first step in the PBS Optimization process within Astroid. Most commonly, a fraction group is simply an arrangement of beams that will be used in a typical daily treatment fraction. The Fraction Group contains some basic group information, as well as Fraction Group level constraints and collections of //Beam Sets// and //Constraints// for each target of the fraction group. The //Beam Set// and various //Constraint// levels are key concepts within Astroid that allow for high levels of control over the Astroid PBS Optimization engine. Further details of these critical items are provided below and additionally, examples of some common cases and how fraction groups, targets, and beam sets can be constructed to meet the clinical needs of various clinical cases can be found in the [[planning:userguide:walkthroughs:prostate_plan|Prostate Plan Walkthrough]].
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 Single Field Optimized treatments are created using this type option. Simply select //SFO// from the //Type// drop down and then add any number of beams and constraints. Each constraint will be equally divided among each beam during optimization. For example, if three beams are included in the Fraction Group and a PTV min constraint of 60 Gy(RBE) is added, then each beam will be individually set to have a constraint of 20 Gy(RBE) (60/3) when running the optimization. Single Field Optimized treatments are created using this type option. Simply select //SFO// from the //Type// drop down and then add any number of beams and constraints. Each constraint will be equally divided among each beam during optimization. For example, if three beams are included in the Fraction Group and a PTV min constraint of 60 Gy(RBE) is added, then each beam will be individually set to have a constraint of 20 Gy(RBE) (60/3) when running the optimization.
 +
 +<WRAP center round info 60%>
 +**Note:** A fraction group with only one beamset and a single beam will always be considered to be an SFO fraction group.
 +</WRAP>
  
 ==== IMPT ==== ==== IMPT ====
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 ===== Working with Fraction Groups =====  ===== Working with Fraction Groups ===== 
  
-  - Select the Create New Fraction Group button {{ :planning:userguide:tutorials:fx_group_create_new.png?300 |}}+  - Select the Create New Fraction Group button
   - In the newly opened block the planner will:   - In the newly opened block the planner will:
     * Choose the color the fraction will be denoted in     * Choose the color the fraction will be denoted in
planning/userguide/tutorials/fraction_group.1498047266.txt.gz · Last modified: 2021/07/29 18:24 (external edit)