X-Ray computed tomography (CT) provides a volumetric analysis of specimens and technical parts. CT is mainly used for the detection of part geometry, vacuoles, cavities and inclusions. It offers the possibility to detect fibers e.g. short glass fibers, and their orientation and length distribution in injection molded parts. An important research field is the detection of carbon fibers in such parts due to their small difference in density compared to the polymer (~1.8 g/cm³ to ~1 g/cm³). Today detection of carbon fibers is possible in voxel size of 2 µm3, but this is not sufficient for technical applications, where fiber orientation and fiber length distribution as 3D data of a defined part volume are of interest for material modeling as well as for fatigue analysis of cyclically loaded fiber reinforced technical parts. This research work deals with the development of a methodology for 3D detection of short carbon fibers as well as practical measurements on injection molded specimens and parts. The conventional approach of detecting part volumes by means of CT is expensive and very time consuming. Our approach aims at using coated short carbon fibers in polymer specimens for improved fiber detection by means of a high resolution µCT. This method enables short scan times of a view minutes while maintaining high resolution of approx. 4 µm. First results show 3D pictures of short carbon fiber orientation over the whole volume of the technical part and subsequent data transfer into software DIGIMAT in order to build-up material models for the scanned part volume. First a defined part volume is suitably meshed and subsequently the µCT detected fiber orientation is mapped into this defined volume for material modeling in DIGIMAT. Furthermore it is also possible to use these data for FEM calculations. Examples for this procedure will be presented e.g. for special part sections like weld line areas.