title: Reconstruction of patient-specific 3D bone surface from 2D calibrated fluoroscopic images and point distribution model.
abstract: Reconstruction of patient-specific 3D bone surface from 2D calibrated fluoroscopic images and a point distribution model is discussed. We present a 2D/3D reconstruction scheme combining statistical extrapolation and regularized shape deformation with an iterative image-to-model correspondence establishing algorithm, and show its application to reconstruct the surface of proximal femur. The image-to-model correspondence is established using a non-rigid 2D point matching process, which iteratively uses a symmetric injective nearest-neighbor mapping operator and 2D thin-plate splines based deformation to find a fraction of best matched 2D point pairs between features detected from the fluoroscopic images and those extracted from the 3D model. The obtained 2D point pairs are then used to set up a set of 3D point pairs such that we turn a 2D/3D reconstruction problem to a 3D/3D one. We designed and conducted experiments on 11 cadaveric femurs to validate the present reconstruction scheme. An average mean reconstruction error of 1.2 mm was found when two fluoroscopic images were used for each bone. It decreased to 1.0 mm when three fluoroscopic images were used.
authors.affiliation: MEM Research Center, University of Bern, CH-3014, Bern, Switzerland. Guoyan.Zheng@MEMcenter.unibe.ch
authors.forename: Guoyan
authors.initials: G
authors.lastname: Zheng
authors.forename: Miguel A G
authors.initials: MA
authors.lastname: Ballester
authors.forename: Martin
authors.initials: M
authors.lastname: Styner
authors.forename: Lutz-Peter
authors.initials: LP
authors.lastname: Nolte
mesh_terms: D000465:Algorithms; D001185:Artificial Intelligence; D002102:Cadaver; D002138:Calibration; D005270:Femur Head / Q000528:radiation effects*; D005471:Fluoroscopy / Q000379:methods* / Q000592:standards; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods*; D066298:In Vitro Techniques; D010363:Pattern Recognition, Automated / Q000379:methods*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D016008:Statistical Distributions; D013382:Subtraction Technique