Target Volume Determination 2015

How do we define the GTV-T?

The GTV-T: CT, MR or FDG-PET?

Microscopic specimen (MS)

GTV (cm 3 ) Δ (%)

MS

12.6

-

CT

20.8

+65

CT ( manual )

MRI

23.8

+89

FDG-PET ( gradient-based autosegmentation)

FDG- PET

16.3

+29

Daisne et al. Radiology 2004;233:93-100.