Among the actually available method of study of surface morphology, 3D representation systems MR and TC have the limits of costs and availability and radiation doses. Laser light triangulation devices allow a high resolution, low-cost, fast and repeatable surface data acquisition. This study aims at evaluation the parameters which may affect facial surface data acquisition by means of a Cyberware colour laser scanner in comparison to the commonly used anthropometrical measurements made by individual examiners. The obtained results might optimise data acquisition and measurements when applied to clinical studies. Different experimental evaluations have been set-up:l- Assessment of optimal scanning conditions involving Phantom study and Environmental evaluation; 2 - Evaluation of dimensional error and consistency. 3- Clinical study: the dimensional precision and repeatability of the scanned models, and the inter-observer consistency were measured on 5 volunteers. Scanning were performed by two observers (A and_B) at three different times (T1, T2, T3), with 15 days intervals. In order to optimise model quality and to reduce artefacts, the scanning method was based on the preceding observations concerning object positioning and environmental conditions, but did not imply predetermined rules for head positioning, eye closure and dental closure. The results of this preliminary study indicate that 3D scanning is a sufficiently precise and repeatable surface 3D acquisition method.
Development of a validation study on a laser triangulation system for the facial morphology analysis
VERZE', Laura;BIANCHI, Silvio Diego;RAMIERI, Guglielmo
2004-01-01
Abstract
Among the actually available method of study of surface morphology, 3D representation systems MR and TC have the limits of costs and availability and radiation doses. Laser light triangulation devices allow a high resolution, low-cost, fast and repeatable surface data acquisition. This study aims at evaluation the parameters which may affect facial surface data acquisition by means of a Cyberware colour laser scanner in comparison to the commonly used anthropometrical measurements made by individual examiners. The obtained results might optimise data acquisition and measurements when applied to clinical studies. Different experimental evaluations have been set-up:l- Assessment of optimal scanning conditions involving Phantom study and Environmental evaluation; 2 - Evaluation of dimensional error and consistency. 3- Clinical study: the dimensional precision and repeatability of the scanned models, and the inter-observer consistency were measured on 5 volunteers. Scanning were performed by two observers (A and_B) at three different times (T1, T2, T3), with 15 days intervals. In order to optimise model quality and to reduce artefacts, the scanning method was based on the preceding observations concerning object positioning and environmental conditions, but did not imply predetermined rules for head positioning, eye closure and dental closure. The results of this preliminary study indicate that 3D scanning is a sufficiently precise and repeatable surface 3D acquisition method.
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