Articles: neuronavigation.
-
Journal of neurosurgery · Dec 2007
New transparent peel-away sheath with neuroendoscopic orientation markers. Technical note.
The peel-away sheath in neuroendoscopic surgery offers numerous advantages and has many potential applications. However, currently available nontransparent sheaths have a critical disadvantage in that disorientation can occur, given the limited visible operative field. To overcome this obstacle, the authors have developed and clinically applied a new transparent sheath with "navigational orientation markers." The clear peel-away sheath provides a transparenchymal route, parenchymal protection, and, most importantly, direct visualization of the surroundings along the whole trajectory and at the distal edge. The navigational orientation markers add further benefits in terms of facilitating orientation in the endoscope trajectory, making this tool extremely useful in neuroendoscopic surgery.
-
Medical image analysis · Dec 2007
Correction of susceptibility artifacts in diffusion tensor data using non-linear registration.
Diffusion tensor imaging can be used to localize major white matter tracts within the human brain. For surgery of tumors near eloquent brain areas such as the pyramidal tract this information is of importance to achieve an optimal resection while avoiding post-operative neurological deficits. However, due to the small bandwidth of echo planar imaging, diffusion tensor images suffer from susceptibility artifacts resulting in positional shifts and distortion. ⋯ The effect of the correction on the pyramidal tract was then quantified by measuring the position of the tract before and after registration. As a result, the distortions observed in phase encoding direction were most prominent at the cortex and the brainstem. The presented approach allows correcting fiber tract distortions which is an important prerequisite when tractography data are integrated into a stereotactic setup for intra-operative guidance.
-
J Spinal Disord Tech · Dec 2007
Case ReportsIso-C3D fluoroscopy-based navigation in direct pedicle screw fixation of Hangman fracture: a case report.
Direct pedicle screw fixation of the C2 is rarely performed in trauma owing to the risk of damage to the neurovascular structures. Computed tomography-based navigation has the problem of change in intersegmental anatomy after positioning for surgery. Iso-C-based computer navigation acquires the intraoperative real-time images after patient positioning and thus avoids registration errors and improves accuracy. ⋯ To our knowledge, this is the first reported case of displaced Hangman fracture treated successfully using Iso-C fluoroscopic navigation assisted direct pedicle screw osteosynthesis in the literature. Intraoperative acquisition of fluoroscopic images avoids registration-related problems. Three-dimensional fluoroscopic navigation gives excellent accuracy and safety in screw instrumentation of Hangman fracture.
-
Acta neurochirurgica · Nov 2007
Case ReportsNeuronavigation guided surgery for parenchymal neurocysticercosis in two patients.
Neurocysticercosis is a rare disease in the Baltic area while it is common in the endemic regions. Two patients with serologically negative parenchymal neurocysticercosis from our neurosurgical department who underwent extirpation of the cystic lesions with neuronavigation guided surgery are reported in this paper. Though most publications propose medical treatment with albendazole and praziquantel for parenchymal neurocysticercosis, surgery can be an option for diagnosis and treatment in conjunction with cysticidal medication if the diagnosis is unclear particularly in non-endemic areas.
-
Acta neurochirurgica · Nov 2007
Diffusion tensor imaging and white matter tractography in patients with brainstem lesions.
Diffusion tensor imaging (DTI) and white matter tractography (WMT) are promising techniques for estimating the course, extent, and connectivity patterns of the white matter (WM) structures in the human brain. In this study, we investigated the ability of DTI and WMT to visualize white matter tract involvement for the preoperative surgical planning and postoperative assessment of brainstem lesions. ⋯ Compared with the information provided by conventional MR imaging, DTI and WMT provided superior quantification and visualization of lesion involvement in eloquent fibre tracts of the brainstem. Moreover, DTI and WMT were found to be beneficial for white matter recognition in the neurosurgical planning and postoperative assessment of brainstem lesions.