During registration, the software maps the patient’s preoperative image data to the physical anatomy of the patient’s head in its current intraoperative position.
Correct registration is a key influencing factor for accurate navigation. Registrations must be verified as accurate and suitable for the procedure to ensure reliable navigation accuracy.
Before You Begin
Carefully read all relevant sections in the Cranial/ENT Instrument User Guide (e.g., Softouch, Z-touch).
Optimizing Registration and Navigation Accuracy
For optimal registration, it is recommended to use CT data together with bone screws as registration points.
Image Set Requirements
To ensure sufficient accuracy, scan the patient as described in the Cranial/ENT Registration and Navigation Scan Protocol.
- The image set must contain the entire area of interest on the patient’s anatomy.
- The image set must contain the entire head including the nose.
- For the highest registration quality, use CT, CTA or MR T1 image sets. MR T2 image sets may lead to reduced registration quality. B0, DTI and deformed image sets cannot be used to register the patient.
Ensure that the patient’s anatomy has not changed from the scan (e.g., swollen areas of the face or skin shift due to a different patient position). This results in incorrect registration and navigation.
Due to possible distortions in MR image sets, navigation accuracy may be decreased at the point of interest, even if registration has been satisfactorily verified on the surface.