583 / 1542
Moving to IMRT and SBRT
Conventional XRT
Homogeneous dose
Prescribed to 95% on PTV edge
Fractionated
3-4 co-planar beams
IMRT and SBRT
Inhomogeneous dose
Prescribe to iso-volume (80-95%)
Hypo-fractionated
Multiple (+/- non-coplanar)
beams
03/01/13