Our concept of computer assisted surgery is based on the combination of intraoperative
magnetic resonance (MR) imaging with microscope-based neuronavigation, providing
anatomical and functional guidance simultaneously. Intraoperative imaging evaluates the
extent of a resection, while the additional use of functional neuronavigation, which displays
the position of eloquent brain areas in the operative field, prevents increasing neurological
deficits, which would otherwise result from extended resections. Up to mid 2001 we …

Intraoperative MR-imaging is used in brain tumor surgery to achieve complete tumor
removal. Damage of functional eloquent brain areas should be avoided to protect the patient
from any surgical-induced harm. We report our experiences in the use of a PC-based system
Localite Brain Navigator®, developed for coregistration of preoperative acquired functional
MR-datasets (fMRI) with pre-or intraoperative acquired MR-datasets for intraoperative
identification of eloquent brain areas. In a pilot series, eight patients with tumors close to the …