title: Establishing spatial correspondence between the inner colon surfaces from prone and supine CT colonography.
abstract: Colonography is an important screening tool for colorectal lesions. This paper presents a method for establishing spatial correspondence between prone and supine inner colon surfaces reconstructed from CT colonography. The method is able to account for the large deformations and torsions of the colon occurring through movement between the two positions. Therefore, we parameterised the two surfaces in order to provide a 2D indexing system over the full length of the colon using the Ricci flow method. This provides the input to a non-rigid B-spline registration in 2D space which establishes a correspondence for each surface point of the colon in prone and supine position. The method was validated on twelve clinical cases and demonstrated promising registration results over the majority of the colon surface.
authors.affiliation: Centre for Medical Image Computing, University College London, UK.
authors.forename: Holger
authors.initials: H
authors.lastname: Roth
authors.forename: Jamie
authors.initials: J
authors.lastname: McClelland
authors.forename: Marc
authors.initials: M
authors.lastname: Modat
authors.forename: Darren
authors.initials: D
authors.lastname: Boone
authors.forename: Mingxing
authors.initials: M
authors.lastname: Hu
authors.forename: Sebastien
authors.initials: S
authors.lastname: Ourselin
authors.forename: Greg
authors.initials: G
authors.lastname: Slabaugh
authors.forename: Steve
authors.initials: S
authors.lastname: Halligan
authors.forename: David
authors.initials: D
authors.lastname: Hawkes
mesh_terms: D000465:Algorithms; D003106:Colon / Q000000981:diagnostic imaging* / Q000502:physiology*; D023881:Colonography, Computed Tomographic / Q000379:methods*; D006801:Humans; D016684:Prone Position / Q000502:physiology*; D011856:Radiographic Image Enhancement / Q000379:methods; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D016683:Supine Position / Q000502:physiology*