Evaluation of the Accuracy of a 3D Imaging System in Craniofacial Patients. J Wittig.

Date: June 25, 2015.
Source: European Craniofacial Congress 2015, Gothenburg, Sweden.
Summary: 3D imaging is an established tool for facial measurement and documentation of craniofacial patients. To date, little data exists about the accuracy of measurements of the whole head in 3D photography, particularly where the presence of hair may impair measurements. 21 patients who had a CT scan and 3D imaging (3dMDcranial System®) of the head within a maximum timeframe of 10 days were selected retrospectively from the craniofacial database of Alder Hey children’s hospital in Liverpool. Surface scans of the CT data and the 3D image were superimposed in the 3dMDvultus® software. A dataset of six anthropometric head measurements was collected from both the CT scan and the 3D image for every patient. In addition 15 cranial indices were calculated for every dataset. The measurements and the cranial indices of the CT scans were compared with the 3D imaging using the Wilcoxon rank signed test for related samples. All measurements acquired from the 3D imaging system showed significantly higher values than the measurements acquired from the CT scans. The comparison of the cranial indices showed no significant difference in 13 of the 15 indices. Head measurements between craniofacial landmarks acquired from 3D imaging were inaccurate when compared with CT data, producing higher values, possibly due to the presence of hair. However cranial indices were preserved in both image formats.
Conclusion: This supports the conclusion that overall shape is accurately described by 3D photography.

Presentation: Evaluation of the Accuracy of a 3D Imaging System in Craniofacial Patients.
Authors: Joern Wittig, David Richardson, Christian Duncan, Ajay Sinha. Oral and Maxillofacial Surgery, University Hospital Salzburg, Salzburg, Austria and Supraregional Craniofacial Unit, Alder Hey Children’s Hospital, Liverpool, United Kingdom.

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