Summary
An infrared based frameless stereotactic navigation device (Easy Guide Neuro) was investigated for its clinical applicability, registration/application accuracy and limitations in a standard operating room set-up.
In a five-month period 40 frameless stereotactic procedures (23 female, 17 male, mean age 46.4, yrs range 10–83) including 36 craniotomies and 4 spinal surgery procedures were performed. Image registration, data transfer and operation planning using skin fixed fiducials (between 5–10, mean 6.6) and CCT in 12 patients/MRI in 28 patients, generally was done the day before surgery.
Clinical applicability was proven in all procedures with an additional time for pre-operative imaging and system application in the OR of 50 min mean (35–120 range). A useful registration was achieved in 39/40 patients (97.5%) with a registration accuracy of 3.4 mm (range 1.8–6.7) for brain surgery cases and 14.4 mm (6.8–25) for spine cases. This resulted in intra-operative application accuracy values for brain surgery of 4.2 mm mean (range 1–12). Enhanced registration/application accuracy values over the test period from 4.2/3.8 mm mean (Cases 1–20) up to 3.2/2 mm mean (Cases 21–40) was observed. In spinal surgery an application accuracy of 11.3 mm mean (range 5–20) was found. An intra-operative re-calibration because of system-head drift was necessary in none of the patients, nevertheless, application accuracy degradation due to brain shift was detected in every case.
In conclusion, the system allowed a time sufficient accurate frameless intra-operative localisation guidance in cavernoma, meningioma, glioma, and brain metastasis surgery. In spinal surgery, the application accuracy exceeded clinical usefulness due to high registration inaccuracy using skin markers.
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Roessler, K., Ungersboeck, K., Dietrich, W. et al. Frameless stereotactic guided neurosurgery: Clinical experience with an infrared based pointer device navigation system. Acta Neurochir 139, 551–559 (1997). https://doi.org/10.1007/BF02750999
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DOI: https://doi.org/10.1007/BF02750999