Generation of discrete beam-intensity modulation by dynamic multileaf collimation under minimum leaf separation constraints

被引:65
作者
Convery, DJ [1 ]
Webb, S
机构
[1] Inst Canc Res, Joint Dept Phys, Sutton SM2 5PT, Surrey, England
[2] Royal Marsden NHS Trust, Sutton SM2 5PT, Surrey, England
关键词
D O I
10.1088/0031-9155/43/9/007
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
An algorithm to generate discrete beam-intensity modulation by dynamic multileaf collimation is presented which incorporates constraints on minimum allowed leaf separations. MLC positioning information is derived simultaneously for all leaf pairs and back-up diaphragms as they progress across the field. A feedback mechanism allows corrections to be applied to eliminate potential violations of minimum separation conditions and any underexposure in the interleaf tongue-and-groove region as they are encountered. The resulting motion correctly delivers the intended modulation and is physically realizable. Implementation of the algorithm is described. Results of the algorithm can also alternatively be interpreted as defining a series of static fields to deliver the same modulation.
引用
收藏
页码:2521 / 2538
页数:18
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