252 / 1241
(> Aortic arch)
40 %
50%
60 %
70 %
Overlap fraction
70 %
80 %
90 %
Pre-radiotherapy scan:
Post-radiotherapy scan:
Residue
34 %
GTV
overlapping area
smallest volume
overlap fraction =
50%
70 %
Aerts et al. Int J Radiat Oncol
Biol Phys 2008;71:1402-1407
Question 1: Do the high-uptake areas within the tumor remain at
the same location during radiotherapy?