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The technological development over the last decades had brought changes of great importance in several areas of knowledge. In engineering, you can mention as one of those great changes is the ideology and construction of mechanical projects, related to the emergence of CAD systems. In medicine, major changes have emerged with the advances offered by Radiology. The alliance of these two areas has provided the opportunity to offer the support to the medical area by the engineering. Thus, the goal of this research is to validate a methodology for modeling geometric shares of dry bone in a CAD system, through image processing, from medical information generated by a CT scan. This research studied a human skull that was used to describe the implementation of the conversion process of information. In this process none of the steps of image processing was done through commercial systems. The main conclusion of this research is that the methodology proposal for geometric modeling of bone parts in CAD systems is effective, and thus can be used in the project and the design of human prosthesis. The methodology developed can be regarded as the first step to support the manufacture of this kind design, but still considered as craft.