Physics Athens 2016

Intensity modulation in Helical Tomotherapy

The amount of modulation is determined by the pitch, modulation factor and field size

Pitch=0.3

Couch Shift

Pitch

Beamlet 1

Beamlet 2

“Each individual beamlet can be intensity modulated changing leaf opening time.”

Beamlet 3

Gantry rotation

Modulation factor