Combining multileaf fields to modulate fluence distributions.

摘要: Abstract Purpose: A method for modulating beam fluence from a linear accelerator is discussed. The modulation accomplished remotely using multileaf collimator and does not require entering the treatment room. Methods Materials: used to define series of field shapes that are superimposed at fixed gantry angle produce any desired pattern. heuristic technique deriving corresponding monitor unit settings described. has been tested on randomly generated distributions with limited number peaks valleys. second type distribution more closely simulates patterns obtained dose optimization software. Estimates time required use this approach treat four-field plan given compared placing physical compensator in each beam. Results: It demonstrated complex within 15 × cm2 can be achieved less than 20 fields. show faster room change compensators. Some limitations Conclusion: Optimized conform irregularly shaped target volumes wrap around critical structures possible defining presented.