Software User Guide Rev. 1.0 Kolibri cranial/ENT Ver. 2.7 91
Surface Matching Registration
Surface Matching Registration Accuracy
About Registration Accuracy
Overview The software displays the verification dialog when registration is complete. This dialog pro-
vides information on the surface matching registration accuracy, i.e., how well the software
was able to match the patient data to the overall area of registered points.
Possible Results
NOTE: Be aware that the precision calculated by the software only provides information
on how well the software was able to match the acquired points to the patient data. This val-
ue does not necessarily represent the overall error.
Decreased
Navigation
Accuracy
To ensure sufficient accuracy, the scan (e.g., CT, MR) must be suitable for ste-
reotactic navigation procedures (as described in the scan protocol).
Due to possible distortions in MR image sets, navigation accuracy may be de-
creased at the point of interest, even if the registration has been satisfactorily
verified.
Due to error propagation, navigation accuracy may be degraded compared to
accuracy achieved at the landmark positions, and at areas where the accuracy
was checked.
Result Deviation
Good accuracy < 1.5 mm
Medium accuracy 1.5 mm - 2.5 mm
Registration failed > 2.5 mm
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