title: Liver Segmentation on CT and MR Using Laplacian Mesh Optimization.
abstract: The purpose of this paper is to describe a semiautomated segmentation method for the liver and evaluate its performance on CT-scan and MR images.
  
  
  
  First, an approximate 3-D model of the liver is initialized from a few user-generated contours to globally outline the liver shape. The model is then automatically deformed by a Laplacian mesh optimization scheme until it precisely delineates the patient's liver. A correction tool was implemented to allow the user to improve the segmentation until satisfaction.
  
  
  
  The proposed method was tested against 30 CT-scans from the SLIVER07 challenge repository and 20 MR studies from the Montreal University Hospital Center, covering a wide spectrum of liver morphologies and pathologies. The average volumetric overlap error was 5.1% for CT and 7.6% for MRI and the average segmentation time was 6 min.
  
  
  
  The obtained results show that the proposed method is efficient, reliable, and could effectively be used routinely in the clinical setting.
  
  
  
  The proposed approach can alleviate the cumbersome and tedious process of slice-wise segmentation required for precise hepatic volumetry, virtual surgery, and treatment planning.
authors.forename: Gabriel
authors.initials: G
authors.lastname: Chartrand
authors.forename: Thierry
authors.initials: T
authors.lastname: Cresson
authors.forename: Ramnada
authors.initials: R
authors.lastname: Chav
authors.forename: Akshat
authors.initials: A
authors.lastname: Gotra
authors.forename: An
authors.initials: A
authors.lastname: Tang
authors.forename: Jacques A
authors.initials: JA
authors.lastname: De Guise
mesh_terms: D000465:Algorithms; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008099:Liver / Q000000981:diagnostic imaging*; D000069550:Machine Learning; D008279:Magnetic Resonance Imaging / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014584:User-Computer Interface