IMRT

Treatment times : the trade-off

Axial slice

Delivery efficiency

Cone-beam Rotational IMRT

Dynamic Arc

Helical Tomotherapy

Number of angles

IMRT

Tomotherapy

3D-CRT

Degrees of freedom

Level of modulation

Verellen et al.

Verellen et al.

“High number of beam angles with moderate modulation seems to be more efficient in terms of delivery time on the current generation of treatment units”