Article
Three-dimensional surfacescanning of the nose during septorhinoplasty
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Published: | August 3, 2011 |
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Introduction: So far documentation before septorhinoplasty has been done by photography (standard background and lighting conditions; photo of frontal, lateral, up and below view). Despite of high quality of documentation a reduction to a pure surface is desirable, because this is needed for operation.
Material and methods: A patternscanner from Vialux was used. Here a projector installed in the patternscanner projects a defined striped pattern on the face. The resulting pattern has been photographed. This deformation of the stripes makes calculation of three-dimensional surface possible. In this study three-dimensional scanning of the nose has been done pre- and postoperative in operation center (OC) from several positions without special conditions. After scanning a 3D-reproduction with the Software PolyWorks has been done. Here anatomic landmarks have been assigned and scans adjusted. An ICP algorithm (iterativ closest point) calculated positions with less distance. By repeating this a three-dimensional model has been created.
Results: 6 patients have been scanned pre- and postoperative in OC. For one measurement 2–4 scans have been necessary. With static and animated presentation the surface shift could be documented.
Discussion: Plain-colored 3D pictures make better perception of the shape of nose, because there is no Irritation by shadow and skin surface e.g. Using the mobile scanner for planning and analysis of patient desires and in every OC is possible. Here defined information about operation outcome is possible before postoperative swallowing of the nose.