The most accurate CT scanning systems are built like a CMM with an X-ray probe.
The use of computed tomography (CT scanning) for dimensional inspection is rapidly expanding as companies discover how this technology is the best solution for a wide range of dimensional inspection, flaw detection, and assembly verification applications. This technology trumps all other technologies for many applications, as CT scanning provides comprehensive 3-D data sets that can completely characterize a part geometry and capture complete data for both outer and inner surfaces. For reverse engineering and rapid prototyping, the STL mesh from CT scanner 3-D data sets are virtually “water-tight” as scanned, as an X-ray does not have the line of sight issues that other sensors have. This means there are no gaps in the surface mesh that must be filled in with “best guess” post-processing of the data. This saves time and provides a more certifiably accurate model.
All CT scanners can provide brilliant 3-D images, offering insight into hidden features that are difficult or impossible to detect with other methods. But not all CT scanners are created equal, and for certified traceable inspection of part dimensions, a CT scanner that provides a true volumetric accuracy statement with a traceable certification should be used.