Abstract
Objective: We have investigated the feasibility of using 3D ultrasound-based neuronavigation
for guiding neuroendoscopy. Methods: A neuronavigation system with an integrated ultrasound scanner was used for acquiring
the 3D ultrasound image data. The endoscope with a tracking frame attached was calibrated
to the navigation system. The endoscope was guided based on intraoperative 3D ultrasound
data in 9 operations. In 5 of the operations, ultrasound angiography data were also
obtained. Updated image data (e. g., more than one 3D ultrasound dataset) were obtained
in 6 of the operations. Results: We found that the image quality of 3D ultrasound was sufficient for image guidance
of the endoscope. Planning of the entry point and trajectory as well as finding optimal
sites for fenestration were successfully performed. Blood vessels were visualized
by 3D ultrasound angiography. In one procedure of third ventriculostomy, the basilar
artery was visualized. Updated image data were quickly obtained, and in two of the
cases, a reduction of the size of cysts was demonstrated. Conclusions: 3D ultrasound gives accurate images of sufficiently high quality for image guidance
of neuroendoscopy. Updated 3D ultrasound datasets can easily be acquired and may adjust
for brain shift. Ultrasound angiography image data are also available with this technology
and can visualize vessels of importance.
Key words
Ultrasound - three-dimensional ultrasound - neuronavigation - neuroendoscopy
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Ola M. Rygh, M. D.
Department of Neurosurgery · St. Olav University Hospital Trondheim
Olav Kyrres gate 17
7005 Trondheim
Norway
Phone: +47/9284/9775
Fax: +47/7386/7977 ·
Email: ola.rygh@ntnu.no