Hematological Malignancies

Gross tumor volume (GTV) (ICRU 83)

• Gross demonstrable extent and location of the tumor (lymphoma)

• Original (before any treatment) lymphoma: pre-chemo GTV – Seen on CT: pre-chemo GTV(CT) – Seen on FDG-PET: pre-chemo GTV(PET) • Residual (after systemic treatment) lymphoma: post-chemo GTV – Seen on CT: post-chemo GTV(CT) – Seen on FDG-PET: postchemo GTV(PET)