Framebased-Frameless_DV_2017

Tissue heterogeneity &

dose prescription

•

The problem is that with the evolution of more accurate or different dose

calculations, the reported doses using one system are not always comparable to

doses obtained with another (

SBRT lung as a case in point!!

•

e.g. recent protocol for a randomized trial: hypofractionated SBRT versus surgery for

IA NSCLC:

ROSEL DOSE PRESCRIPTION

(Hurkmans

et al.

, Radiat Oncol 2008)

For type A dose calculation models: 3 x 20 Gy

For type B dose calculation models: 3 x 18 Gy

Pencil Beam versus Monte Carlo Dose Calculation

SBRT 2017 - D. Verellen

Type A

Type B