Geometric accuracy of the NewTom 9000 Cone Beam CT

Objectives: To determine the geometric accuracy of digital volume tomograms to assess their usability for implant planning. Methods: A measuring object with 216 measuring points, whose geometry is exactly known, is X-rayed with a NewTom 9000 cone beam scanner; thereafter the geometry of the volume tomogram of the object is compared with the original body. Results: Considering all three coordinate axes, geometric mean deviations of 0.13±0.09 mm with a maximum deviation of 0.3 mm were determined. These geometric deviations are below the resolution power of the volume tomograph. Conclusion: The digital volume tomographies of NewTom 9000 present images which are geometrically correct and, from a geometrical point of view, suitable for three-dimensional implant planning.