title: Model-updated image-guided minimally invasive off-pump transcatheter aortic valve implantation.
abstract: This paper presents a method for assisting the placement of stented aortic valve prosthesis during minimally invasive off-pump transcatheter aortic valve implantation (TAVI) under live 2-D X-ray fluoroscopy guidance. The proposed method includes a dynamic overlay of an intra-operative 3-D aortic root mesh model and an estimated target area of valve implantation onto live 2-D fluoroscopic images. This is based on a template-based tracking procedure of a pigtail catheter without further injections of contrast agent. Minimal user-interaction is required to initialize the algorithm and to correct fluoroscopy overlay errors if needed. Retrospective experiments were carried out on ten patient datasets from the clinical routine of the TAVI. The mean displacement errors of the updated aortic root mesh model overlays are less than 2.0 mm without manual overlay corrections. The results show that the guidance performance of live 2-D fluoroscopy is potentially improved when using our proposed method for the TAVIs.
authors: Innovation Center Computer Assisted Surgery (ICCAS), University of Leipzig, Germany. mohamed.karar@medizin.uni-leipzig.de
authors: Mohamed Esmail
authors: ME
authors: Karar
authors: Matthias
authors: M
authors: John
authors: David
authors: D
authors: Holzhey
authors: Volkmar
authors: V
authors: Falk
authors: Friedrich-Wilhelm
authors: FW
authors: Mohr
authors: Oliver
authors: O
authors: Burger
mesh_terms: D000465:Algorithms; D001021:Aortic Valve / Q000601:surgery; D003287:Contrast Media / Q000494:pharmacology; D004867:Equipment Design; D005471:Fluoroscopy / Q000295:instrumentation / Q000379:methods; D006350:Heart Valve Prosthesis; D019918:Heart Valve Prosthesis Implantation / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D019060:Minimally Invasive Surgical Procedures / Q000379:methods*; D015233:Models, Statistical; D012984:Software; D025321:Surgery, Computer-Assisted / Q000379:methods*
chemical_list: D003287:Contrast Media