Accurate extraction of liver on abdominal CT images is an important technique for quantification of its volume change. We propose a computerized scheme for hepatic extraction on abdominal CT images automatically in this article. Our computerized scheme consists of four steps. The first step is an extraction of abdominal region. In the next step, a threshold is decided by use of histogram feature of CT densities. In the third step, a rough region is extracted with a labeling and a erosion and a dilatation algorithms. In the final step, the fine region is extracted with a watershed algorithms and template matching. As a result, we are able to obtain segmented hepatic region. To evaluate the performance of this scheme, 14 cases on abdominal CT images were processed by this scheme.

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