Linear accuracy and reliability of volume data sets acquired by two CBCT-devices and an MSCT using virtual models: A comparative in-vitro study. (2nd January 2016)

• Record Type: Journal Article
• Authors: Wikner, Johannes; Hanken, Henning; Eulenburg, Christine; Heiland, Max; Gröbe, Alexander; Assaf, Alexandre Thomas; Riecke, Björn; Friedrich, Reinhard E.
• Is Part Of: Acta odontologica Scandinavica. Volume 74:Number 1(2016)
• Page Start: 51
• Page End: 59
• Publication Date: 2016-01-02
• Subjects: C-arm -- computed tomography (CT) -- cone beam computed tomography (CBCT) -- maximum intensity projection (MIP) -- multiplanar reconstructions (MPR) -- three-dimensional (3D); Dentistry -- Periodicals; 617.6005
• DOI: 10.3109/00016357.2015.1040064
• Languages: English
• ISSNs: 0001-6357

Abstract

Abstract: Objective. To discriminate clinically relevant aberrance, the accuracy of linear measurements in three-dimensional (3D) reconstructed datasets was investigated. Materials and methods. Three partly edentulous human skulls were examined. Landmarks were defined prior to acquisition. Two CBCT-scanners and a Quad-slice CT-scanner were used. Actual distances were physically measured with calipers and defined as a reference. Subsequently, from digital DICOM datasets, 3D virtual models were generated using maximum intensity projections (MIPs). Linear measurements were performed by semi-automated image analysis. Virtual and analogue linear measurements were compared using repeated measurements in a mixed model ( p ≤ 0.05). Results. No significant difference was found among all of the digital measurements when compared to one another, whereas a significant difference was found in matched-pairs analysis between CBCT and calipers ( p = 0.032). All digitally acquired data resulted in lower mean values compared to the measurements via calipers. A high level of inter-observer reliability was obtained in the digital measurements (inter-rater correlation = 0.988–0.993). Conclusions. The reconstructed datasets led to highly consistent values among linear measurements. Yielding sub-millimeter precision, these modalities are assumed to reflect reality in a clinically irrelevant altered manner. During data acquisition and evaluation, a maximum of precision must be achieved.