Development and preliminary evaluation of VISLAN, a surgical planning and guidance system using intra-operative video imaging.
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.
Colchester
A C
AC
Department of Neurology, UMDS, Guy's Hospital, London, UK. a.colchester@boris.umds.ac.uk
Zhao
J
J
Holton-Tainter
K S
KS
Henri
C J
CJ
Maitland
N
N
Roberts
P T
PT
Harris
C G
CG
Evans
R J
RJ
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