IMRT 2018

Fan$beam$Arc$IMRT:$Helical Tomotherapy

• Helical'irradiation:'Synchronization'movement'between'gantry'rotation'and' longitudinal'couch'movement • Gantry'rotation:'continuous'gantry'rotation'(360 o )'with'51'projection'>>'MLC' shape'and'pattern'is'modified'every'7 o .' • The'modulation'is'obtained'varying'the'fraction'time'in'which'every'leaf'is' on/off • Gantry'speed'and'treatment'time'are'dependent'on'prescription'dose,'target' length,'machine'doseMrate'and'on'user'selectable'planning'parameters

Slide courtesy to Sara Broggi