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beam type/technical

2014-01-09  SanySmile
beam type
  1. static, 所有的出束控制点的属性是不变的
  2. dynamic,在一个或多个控制点的属性是可变的,gantry运动中出束
STATIC = All Control Point Sequence (300A,0111) attributes remain unchanged between consecutive pairs of control points with changing Cumulative Meterset Weight (300A,0134). DYNAMIC = One or more Control Point Sequence (300A,0111) attributes change between one or more consecutive pairs of control points with changing Cumulative Meterset Weight (300A,0134).

beam technical
  1. step and shoot,MLC变化到某个形状,出束,再变化,再出束,不会同时进行。
  2. sliding window,MLC连续变化,连续出束,同时进行。
planning type
  1. 2D, general plan,常规计划;
  2. Conformal,适形计划;
  3. IMRT,调强计划;
  4. conformal arc,适形拉弧治疗,MLC实行变化
  5. burst arc,西门子的模式,只能在很小的弧度内连续出束,当MLC移动时是不能出束的,只有当MLC形状已经适形完成,才会在很小的弧度出束
  6. continuous arc,例如医科达的VMAT和瓦里安的Rapid arc,在指定弧度内连续出束,且同时MLC性状发生变化。
Burst mode delivery differs from continuous mode delivery, used by Elekta's VMAT (Elekta Ltd, Crawley, UK) and Varian's RapidArc (Varian Medical Systems, Palo Alto, CA, USA) implementations, in that dose is not delivered while MLC leaves are moving. Instead, dose is delivered in bursts over very short arc angles and only after an MLC segment shape has been completely formed and verified by the controller.

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