Registration establishes the spatial correspondence between preoperative MRI or CT data and the patient’s anatomy during surgery. Without that alignment, the displayed location of a tracked instrument could not be interpreted reliably against brain or spinal structures. This step converts stored imaging into a usable spatial reference for surgical planning and guidance.
Tracked instruments provide position data, while the surgical reference system supplies the reference needed to relate that position to the registered images. The navigation display can then show where the instrument lies relative to critical tissue in real time. This relationship helps surgeons maintain spatial orientation while planning or controlling work around sensitive structures.
Brain shift can change the location of tissue after surgery begins, so a preoperative scan may no longer match the anatomy perfectly. Intraoperative neuronavigation should therefore not be interpreted as an infallible map. Direct anatomical visualization and intraoperative imaging, when available, provide complementary information that helps clinicians judge whether the displayed relationships remain useful.
Clinicians begin with preoperative MRI or CT scans, register those images to the patient’s anatomy, and establish a surgical reference system. They then use tracked instruments to compare the instrument position with structures shown on the navigation display. During the operation, direct visualization and available intraoperative imaging help assess the continuing relevance of that guidance.
It can support planning and guidance for tumor resection, vascular procedures, biopsies, and electrode placement. Navigation helps relate instruments and operative targets to imaged structures, while attention to critical or eloquent regions supports procedural control. These applications make the technology relevant to both clinical care and neuroscience research.
Navigation supports spatial planning around eloquent regions by showing the instrument’s position relative to critical tissue. Clinicians do not treat that display as a substitute for direct anatomical assessment; they interpret it alongside visual findings and, when available, intraoperative imaging. This combined approach supports procedural control when work occurs near sensitive anatomy.