Okabayashi T, et al. - In this work, volumetric and functional rates of remnant liver are measured using technetium-99m-galactosyl human serum albumin single photon emission computed tomography/computed tomography (99mTc-GSA SPECT/CT) fusion imaging to evaluate post-hepatectomy remnant liver function. The results indicate that remnant (rem) KGSA (= KGSA × functional rate) provided information that allowed the prediction of remnant liver function. This information seem to help surgeons when deciding on a treatment plan for patients with liver diseases.