title: Automatic prone to supine haustral fold matching in CT colonography using a Markov random field model.
abstract: CT colonography is routinely performed with the patient prone and supine to differentiate fixed colonic pathology from mobile faecal residue. We propose a novel method to automatically establish correspondence. Haustral folds are detected using a graph cut method applied to a surface curvature-based metric, where image patches are generated using endoluminal CT colonography surface rendering. The intensity difference between image pairs, along with additional neighbourhood information to enforce geometric constraints, are used with a Markov Random Field (MRF) model to estimate the fold labelling assignment. The method achieved fold matching accuracy of 83.1% and 88.5% with and without local colonic collapse. Moreover, it improves an existing surface-based registration algorithm, decreasing mean registration error from 9.7mm to 7.7mm in cases exhibiting collapse.
authors: Centre for Medical Image Computing, University College London, London, UK.
authors: Thomas
authors: T
authors: Hampshire
authors: Holger
authors: H
authors: Roth
authors: Mingxing
authors: M
authors: Hu
authors: Darren
authors: D
authors: Boone
authors: Greg
authors: G
authors: Slabaugh
authors: Shonit
authors: S
authors: Punwani
authors: Steve
authors: S
authors: Halligan
authors: David
authors: D
authors: Hawkes
mesh_terms: D000465:Algorithms; D001331:Automation; D003106:Colon / Q000000981:diagnostic imaging / Q000473:pathology*; D003111:Colonic Polyps / Q000473:pathology*; D023881:Colonography, Computed Tomographic / Q000379:methods*; D003113:Colonoscopy / Q000379:methods; D003198:Computer Simulation; D004724:Endoscopy / Q000379:methods; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008390:Markov Chains; D016684:Prone Position; D015203:Reproducibility of Results; D012984:Software; D016683:Supine Position