<XML><RECORDS><RECORD><REFERENCE_TYPE>0</REFERENCE_TYPE><REFNUM>6911</REFNUM><AUTHORS><AUTHOR>Khambay,B.</AUTHOR><AUTHOR>Nebel,J-C.</AUTHOR><AUTHOR>Bowman,J.</AUTHOR><AUTHOR>Ayoub,A.</AUTHOR><AUTHOR>Walker,F.</AUTHOR><AUTHOR>Hadley,D.</AUTHOR></AUTHORS><YEAR>2002</YEAR><TITLE>A pilot study: 3D stereo photogrammetric image superimposition on to 3D CT scan images - the future of orthognathic surgery</TITLE><PLACE_PUBLISHED>The International Journal of Adult Orthodontics & Orthognathic Surgery, Winter 2002, Volume 17, Issue 4 </PLACE_PUBLISHED><PUBLISHER>Ablex Publishing Corporation, New Jersey, U.S.A.</PUBLISHER><PAGES>331-341</PAGES><LABEL>Khambay:2002:6911</LABEL><ABSTRACT>The aim of this study was to register and assess the accuracy of the superimposition method of a 3D soft tissue stereo photogrammetric image (C3D image) and a 3D image of the underlying skeletal tissue acquired by 3D spiral CT (CT image). The study was conducted on a model head, in which an intact human skull was embedded with an overlying latex mask reproducing anatomical features of a human face. Ten artificial radio opaque landmarks were secured onto the surface of the latex mask. A stereo photogrammetric image of the mask and a 3D spiral CT image of the model head were captured. The C3D image and the CT images were registered for superimposition by three different methods; Procrustes superimposition using artificial landmarks, Procrustes analysis using anatomical landmarks, and partial Procrustes analysis using anatomical landmarks and then registration completion by HICP using a specified region of both images. The results showed that Procrustes superimposition using the artificial landmarks and Procrustes analysis using anatomical landmarks produced an error of superimposition in the order of 2mm. Partial Procrustes analysis using anatomical landmarks followed by HICP produced a superimposition accuracy of between 1.25 and 1.5 mm. It was concluded that a stereo photogrammetry and a 3D spiral CT scan image can be superimposed with an accuracy of between 1.25 and 1.5 mm using partial Procrustes analysis based on anatomical landmarks and then registration completion by HICP. </ABSTRACT></RECORD></RECORDS></XML>