[Accuracy of morphological simulation for orthognatic surgery. Assessment of a 3D image fusion software].
BACKGROUND
The CT/CBCT data allows for 3D reconstruction of skeletal and untextured soft tissue volume. 3D stereophotogrammetry technology has strongly improved the quality of facial soft tissue surface texture. The combination of these two technologies allows for an accurate and complete reconstruction. The 3D virtual head may be used for orthognatic surgical planning, virtual surgery, and morphological simulation obtained with a software dedicated to the fusion of 3D photogrammetric and radiological images.


METHODS
The imaging material include: a multi-slice CT scan or broad field CBCT scan, a 3D photogrammetric camera. The operative image processing protocol includes the following steps: 1) pre- and postoperative CT/CBCT scan and 3D photogrammetric image acquisition; 2) 3D image segmentation and fusion of untextured CT/CBCT skin with the preoperative textured facial soft tissue surface of the 3D photogrammetric scan; 3) image fusion of the pre- and postoperative CT/CBCT data set virtual osteotomies, and 3D photogrammetric soft tissue virtual simulation; 4) fusion of virtual simulated 3D photogrammetric and real postoperative images, and assessment of accuracy using a color-coded scale to measure the differences between the two surfaces.
Service de chirurgie maxillofaciale et de chirurgie buccale, département de chirurgie, faculté de médecine, hôpitaux universitaires, 1211 Genève, Suisse.
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Terzic
Service de stomatologie et chirurgie maxillofaciale, hôpital de la Pitié-Salpêtrière, 75651 Paris cedex 13, France.
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Schouman
Service de chirurgie maxillofaciale et de chirurgie buccale, département de chirurgie, faculté de médecine, hôpitaux universitaires, 1211 Genève, Suisse. Electronic address: paolo.scolozzi@hcuge.ch.
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Scolozzi
Chirurgie assistée par ordinateur; Chirurgie orthognatique; Computer simulation; Computer-assisted surgery; Imagerie tridimensionnelle; Orthognathic surgery; Simulation informatique; Three-dimensional imaging