Abstract: There are some areas of interest on 3D images of the high precision industrial CT, such as defects caused during the production process. In order to take a close analysis of these areas, the image processing software Amira was used on the data of a particular workpiece sample to do defects segmentation and display, defects measurement, evaluation and documentation. A data set obtained by scanning a vise sample using the lab CT system was analyzed and the results turn out to be fairly good.