A method for evaluating and predicting residual liver function was devised for dynamic single photon emission computed tomography (SPECT). The ratio of residual volume to total effective liver volume, K value and predictive index using dynamic SPECT were compared with respective values using dynamic planar scintigraphy. The coefficients of correlation were 0.86 (the ratio), 0.91 (K value) and 0.88 (predictive index). The predictive index, measured by dynamic SPECT, was as useful as by dynamic planar scintigraphy. In addition, the resecting line using SPECT was more accurate than using planar scintigraphy. Dynamic SPECT was more useful than dynamic planar scintigraphy.