In addition to imaging, radionuclide venography (RNV) can also be used for the post-therapy evaluation of patients with superior vena cava syndrome (SVGS) by utilizing the indices of transit time (TT), time of half peak count (TH) and peak count ratio (PC ratio). [Methods] Using Tc-99m MAA, RNV was performed twice, before and after anti-cancer therapy, on 30 patients having SVCS due to lung cancer. [Results] Based on images, patients were initially classified into Groups C (with collaterals,

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... 3), 1(with jugular venous reflux, n=5) and P (no reflux or collaterals, n=12). After therapy, images improved in 12, worsened in one and remained unchanged in 17 patients (> 50%). However, by applying these indices, post-therapy hemodynamic improvement could be well documented in all