Artikel
Linear Accuracy and Reliability of Volume Data Sets Acquired by Two CBCT-Devices and a MSCT using Virtual Models – A Comparative in-vitro Study
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Veröffentlicht: | 12. Dezember 2014 |
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Gliederung
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Aim: To discriminate clinically relevant aberrance, accuracy of linear measurements in three-dimensional reconstructed data-sets was investigated.
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 a calliper and defined as reference. Subsequently, from digital DICOM data-sets three-dimensional virtual models have been generated using maximum intensity projections (MIP). Linear measurements were performed by semi-automated image analysis. Virtual and analogue linear measurements were compared using repeated measurements in a mixed model (p<or =.05).
Results: No significant difference was found among all digital measurements compared to each other while a significant difference was found in matched-pairs analysis between CBCT and calliper (p=0.032). All digitally acquired data resulted in lower mean values compared to the measurements via calliper. A high interobserver reliability was given in digital measurements (interrater-correlation 0.988 to 0.993).
Conclusion: The reconstructed data-sets led to highly consistent values in linear measurements. Yielding a sub-millimetre precision these modalities are assumed to reflect reality in a clinically irrelevant altered manner. During acquisition and evaluation of data a maximum of precision must be achieved.