IMRT

Conclusion

Linac

“ Safety margins incorporating motion ”

“ Gating ”

Linac

“ Exposure of large volumes of healthy tissue ”

-static beam -static couch -small beam -20-30% duty cycle “ Very long treatment ti es (duty cycle 20-30%) ”

-static beam -static couch -wide beam -100% duty cycle

Linac

Linac

“ Dynamic couch compensation ”

“ Tracking/Pusuit ”

-static beam “ Some parts of the achine have to move actively, responding real-time to tumor motion for counteracting or pursuit ” -dynamic couch -small beam ->90% duty cycle -dynamic beam -static couch -small beam ->90% duty cycle