Folie 1

Positioning for spine SBRT

Figure 1. The relationship between translational displacements (n=249) measured between arcs 1 and

2, and time (x-axis, minutes), where time represents the interval between the start of the CBCT

performed before arc 1 and the start of the first CBCT scan after completion of arc 1.

Mean 18.3 min (6.6 min)

From start imaging to end

arcs

FFF, 2400 MU/min,

7-10 Gy/fraction

Dahele M et al, Acta Oncologica, 2016