title: Prostate contours delineation using interactive directional active contours model and parametric shape prior model.
abstract: Prostate contours delineation on Magnetic Resonance (MR) images is a challenging and important task in medical imaging with applications of guiding biopsy, surgery and therapy. While a fully automated method is highly desired for this application, it can be a very difficult task due to the structure and surrounding tissues of the prostate gland. Traditional active contours-based delineation algorithms are typically quite successful for piecewise constant images. Nevertheless, when MR images have diffuse edges or multiple similar objects (e.g. bladder close to prostate) within close proximity, such approaches have proven to be unsuccessful. In order to mitigate these problems, we proposed a new framework for bi-stage contours delineation algorithm based on directional active contours (DAC) incorporating prior knowledge of the prostate shape. We first explicitly addressed the prostate contour delineation problem based on fast globally DAC that incorporates both statistical and parametric shape prior model. In doing so, we were able to exploit the global aspects of contour delineation problem by incorporating a user feedback in contours delineation process where it is shown that only a small amount of user input can sometimes resolve ambiguous scenarios raised by DAC. In addition, once the prostate contours have been delineated, a cost functional is designed to incorporate both user feedback interaction and the parametric shape prior model. Using data from publicly available prostate MR datasets, which includes several challenging clinical datasets, we highlighted the effectiveness and the capability of the proposed algorithm. Besides, the algorithm has been compared with several state-of-the-art methods.
authors.affiliation: Telecommunications Laboratory, Technology Faculty, Abou Bekr Belkaïd University, Tlemcen, 13000, Algeria.|Université Nord de France, F-59000, Lille, France.|Unité de Traitement de Signaux Biomédicaux, Faculté de médecine et maïeutique, Lille, France.|LAMIH UMR CNRS 8201, Le Mont Houy, Université de Valenciennes et Cambresis, 59313, Valenciennes, France.
authors.forename: Foued
authors.initials: F
authors.lastname: Derraz
authors.affiliation: Unité de Traitement de Signaux Biomédicaux, Faculté de médecine et maïeutique, Lille, France.|Groupement des Hopitaux de l'́Institut Catholique de Lille, France.
authors.forename: Gérard
authors.initials: G
authors.lastname: Forzy
authors.affiliation: Groupement des Hopitaux de l'́Institut Catholique de Lille, France.
authors.forename: Arnaud
authors.initials: A
authors.lastname: Delebarre
authors.affiliation: Université Nord de France, F-59000, Lille, France.|LAMIH UMR CNRS 8201, Le Mont Houy, Université de Valenciennes et Cambresis, 59313, Valenciennes, France.
authors.forename: Abdelmalik
authors.initials: A
authors.lastname: Taleb-Ahmed
authors.affiliation: School of Electronics, Electrical and Computer Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
authors.forename: Mourad
authors.initials: M
authors.lastname: Oussalah
authors.affiliation: Université Nord de France, F-59000, Lille, France.|Hautes Etudes dÍngénieur, 13 rue de Toul, 59000, Lille, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Peyrodie
authors.affiliation: Groupement des Hopitaux de l'́Institut Catholique de Lille, France.
authors.forename: Sebastien
authors.initials: S
authors.lastname: Verclytte
mesh_terms: D000465:Algorithms; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging; D008297:Male; D008954:Models, Biological; D015233:Models, Statistical; D010384:Pelvic Bones / Q000033:anatomy & histology; D011467:Prostate / Q000033:anatomy & histology*; D001743:Urinary Bladder / Q000033:anatomy & histology
keywords: Bhattacharyya distance; T2-weighted MR images; characteristic function; directional active contours; parametric shape prior; prostate shape; total variational framework; user interaction