Usefulness of 99mTc-GSA Scintigraphy for Evaluation of Hepatic Function: Development of New Index

99mTc-GSA scintigraphy was performed to evaluate reserved hepatic function in 32 patients with hepatobiliary tumor. Each parameters; HH15, LHL15 and T1/2 showed good correlation with ICG15 in patients without obstructive jaundice. Contrary, each indices did not significantly correlate with ICG15 in cases including obstructive jaundice. Each indices obtained from 99mTc-GSA scintigraphy was useful parameters to reflect liver functional reserve which was not affected by hyperbilirubinemia. New index, T1/2 was more useful than other indices for differentiating hepatic dysfunctional state from normal condition.