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Computed tomography (CT) and magnetic resonance imaging (MRI) in the medical area deliver huge amounts of data, which doctors have to handle in a short time. These data can be visualised efficiently with direct volume rendering. Consequently most direct volume rendering applications on the market are specialised on medical tasks or integrated in medical visualisa- tion environments. Highly evolved applications for tasks like diagnosis or surgery simulation are available in this area. In the last years, however, another area is making increasing use of com- puted tomography. Companies like phoenix |x-ray, founded in 1999 pro- duce CT-scanners especially dedicated to industrial applications like non destructive material testing (NDT). Of course an application like NDT has different demands on the visualisation than a typical medical application. For example a typical task for non destructive testing would be to high- light air inclusions (pores) in a casting. These inclusions usually cover a very small area and are very hard to classify only based on their density value as this would also highlight the air around the casting. This thesis presents multiple approaches to improve the rendering of in- dustrial CT data, most of them based on higher dimensional transfer func- tions. Therefore the existing volume renderer application of VRVis was extended with a user interface to create such transfer functions and exist- ing render modes were adapted to profit from the new transfer functions. These approaches are especially suited to improve the visualisation of sur- faces and material boundaries as well as pores. The resulting renderings make it very easy to identify these features while preserving interactive framerates.