Target Volume Determination 2015

PET for GTV definition: summary

• GTV-T: – accurate in definition of length with threshold (GTV

20%), not good for the entire GTV – Decrease variability (inter-intra) • GTV-N:

– high specificity 90% – low sensitivity 57%:

– Poor spatial resolution (nodes adjacent to the primary) – Partial volume effect (size 5-10mm)