Abstract
Fiducial markers visible on both imaging scans and the patient are a convenient and accurate method to register the patients head in stereotactic space preceeding an interactive image directed neurosurgical procedure. We have been using the Laitinen non-invasive relocatable stereo-adapter to carry the fidcucial markers both during the imaging and patient registration process. Since the adapter can be accurately remounted the surgical procedure can take place at any time interval after the imaging study. To compare registration accuracy studies were performed using a phantom carrying both surface fiducial markers and fiducial markers mounted on the stereo adapter. We have found that total system accuracy using either surface or adapter mounted markers and an optical tracking system is in the range of 3-5 mm and is acceptable for a broad range of neurosurgical applications.
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