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Dentomaxillofacial Radiology (2005) 34, 28-31
© 2005 British Institute of Radiology
doi: 10.1259/dmfr/31342245

RESEARCH

Geometric accuracy of the NewTom 9000 Cone Beam CT

R Marmulla*, R Wörtche, J Mühling and S Hassfeld

Department of Cranio-Maxillofacial Surgery, University of Heidelberg, Heidelberg, Germany

*Correspondence to: Priv.-Doz. Dr. Dr. Rüdiger Marmulla, Department of Cranio-Maxillofacial Surgery, University of Heidelberg, Im Neuenheimer Feld 400, D-69120 Heidelberg, Germany; Email: ruediger_marmulla{at}med.uni-heidelberg.de

Received 27 July 2004; revised 8 November 2004; accepted 14 November 2004

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.

Keywords: cone beam CT; digital volume tomogram; geometric accuracy; surgical planning; implant planning




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