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--- planning:userguide:tutorials:fraction_group [2017/08/03 16:21] – [Working with Fraction Groups] dpatenaude
+++ planning: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]].