Differences

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--- planning:userguide:tutorials:pbs_beams [2019/08/26 11:07] – [General Settings] dpatenaude
+++ planning:userguide:tutorials:pbs_beams [2021/07/29 18:28] (current) – external edit 127.0.0.1
@@ Line 36: / Line 36: @@
 {{ :planning:userguide:tutorials:sobp_beam_general_settings_target_selection.png?300 |}}
-  * If the target selected is an existing beam, the new beam becomes a //**Patch beam**// or //**field**//. Thus, the targeted beam becomes a parent thru-beam of the current patch beam (child).
+  * If the target selected is an existing beam, the new beam becomes a //**Patch beam**//. Thus, the targeted beam becomes a parent thru-beam of the current patch beam (child).
-    * The patch dose field box is then enabled, allowing users to enter a dose value amount. This value will identify areas of the thru-beam's targeted volume that received less than then the entered dose amount.
+    * The patch dose field box is then enabled, allowing users to enter a dose value amount. The parent beam's target will reduced such that any portion receiving a dose from the parent beam that is greater than this amount will be ignored when designing the patch beam range compensator. In other words, the target of the patch beam becomes the target of the parent beam, minus the volume enclosed by the isodose surface (compute only for parent beam) at the defined patch dose value. This patch beam target can be viewed in the Display UI and toggled on and off in the right hand side beam controls.
-    * The patch beam will become the portion of the parent thru-beam's target that is less than the dose value entered. This patch target can be viewed in the Display UI and toggled on and off in the right hand side beam controls.
+    * Patch beams can also be "chained" beyond a single parent-child pair by creating a beam and selecting the desired patch beam as the target.
-    * To create a patch beam of an existing patch beam, select the desired patch beam as the target.
+    * Also note, that once a beam is designated as a patch and added to a fraction group, it cannot be changed back to a standard non-patch beam. In such cases, you must either remove the beams from the Fraction Group first, or a new SOBP beam must be created.
-    * Once a beam is designated as a patch and added to a fraction group, it cannot change back to a standard non-patch beam. Thus, a new SOBP beam must be created.
 ==== Beam Approach ====