title: Development and preliminary evaluation of VISLAN, a surgical planning and guidance system using intra-operative video imaging.
abstract: VISLAN is an integrated neurosurgical planning and guidance system. New segmentation and rendering techniques have been incorporated. A stereo video system is used intra-operatively and fulfils four roles. First, the video display is overlaid with graphical outlines showing the position of the planned craniotomy or the target (enhanced reality displays). Second, a skin surface patch is reconstructed from the stereo video images using patterned light (mean errors of surface point location are < 0.15 mm). Third, a freely mobile, hand-held localizer is tracked in real time (position errors are < 0.5 mm and with improved calibration < 0.2 mm), with its position superimposed on the pre-operative patient representation to assist surgical guidance. Fourth, markers fixed to the skull bone next to the cranial opening are used to detect intra-operative movement and to update registration. Initial results from phantom experiments show an overall system accuracy of better than 0.9 mm for intra-operative localization of features defined in pre-operative images. The prototype system has been tested during six neurosurgical operations with very good results.
authors.affiliation: Department of Neurology, UMDS, Guy's Hospital, London, UK. a.colchester@boris.umds.ac.uk
authors.forename: A C
authors.initials: AC
authors.lastname: Colchester
authors.forename: J
authors.initials: J
authors.lastname: Zhao
authors.forename: K S
authors.initials: KS
authors.lastname: Holton-Tainter
authors.forename: C J
authors.initials: CJ
authors.lastname: Henri
authors.forename: N
authors.initials: N
authors.lastname: Maitland
authors.forename: P T
authors.initials: PT
authors.lastname: Roberts
authors.forename: C G
authors.initials: CG
authors.lastname: Harris
authors.forename: R J
authors.initials: RJ
authors.lastname: Evans
mesh_terms: D001254:Astrocytoma / Q000175:diagnosis / Q000601:surgery; D001921:Brain / Q000473:pathology; D001932:Brain Neoplasms / Q000175:diagnosis / Q000601:surgery*; D003198:Computer Simulation; D006801:Humans; D007091:Image Processing, Computer-Assisted; D016343:Monitoring, Intraoperative / Q000295:instrumentation*; D009464:Neuroma, Acoustic / Q000175:diagnosis / Q000601:surgery; D019635:Neurosurgical Procedures / Q000379:methods; D013238:Stereotaxic Techniques; D014584:User-Computer Interface; D014741:Video Recording