IMRT

A moving treatment beam

Medical linac full beam line

“ What parts of the beam line should move to create a moving beam? ” Dynamics of breathing/tracking: -Frequencies up to 30 Hz -Amplitudes of a few centimeters -Sub-milimeter accuracy Too heavy !!! (>>1000kg)

Electron Gun

RF Power

Accelerator

Target Primary collimator

Flattening filter

Jaws (X,Y)

“ Loose some of that weight ” -by compact design? -by omitting some heavy components?

MLC