title: Spine segmentation using articulated shape models.
abstract: Including prior shape in the form of anatomical models is a well-known approach for improving segmentation results in medical images. Currently, most approaches are focused on the modeling and segmentation of individual objects. In case of object constellations, a simultaneous segmentation of the ensemble that uses not only prior knowledge of individual shapes but also additional information about spatial relations between the objects is often beneficial. In this paper, we present a two-scale framework for the modeling and segmentation of the spine as an example for object constellations. The global spine shape is expressed as a consecution of local vertebra coordinate systems while individual vertebrae are modeled as triangulated surface meshes. Adaptation is performed by attracting the model to image features but restricting the attraction to a former learned shape. With the developed approach, we obtained a segmentation accuracy of 1.0 mm in average for ten thoracic CT images improving former results.
authors.affiliation: Institut für Informationsverarbeitung, Leibniz University of Hannover, Germany. klinder@tnt.uni-hannover.de
authors.forename: Tobias
authors.initials: T
authors.lastname: Klinder
authors.forename: Robin
authors.initials: R
authors.lastname: Wolz
authors.forename: Cristian
authors.initials: C
authors.lastname: Lorenz
authors.forename: Astrid
authors.initials: A
authors.lastname: Franz
authors.forename: Jörn
authors.initials: J
authors.lastname: Ostermann
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D010363:Pattern Recognition, Automated / Q000379:methods*; D011856:Radiographic Image Enhancement / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013131:Spine / Q000000981:diagnostic imaging*; D013382:Subtraction Technique; D014057:Tomography, X-Ray Computed / Q000379:methods*