Registration Accuracy; About Registration Accuracy - Brainlab Kolibri cranial Software User's Manual

Standard Registration

Registration Accuracy

About Registration Accuracy

Overview Following registration, the software calculates the precision of the match. This represents
the average deviation between the registered markers/landmarks and the actual position of
the markers/landmarks in the image set.
Use this information, along with a visual verification of the anatomical information, to de-
termine the overall error.
Possible Results
Result
Good accuracy
Medium accuracy
Registration failed
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 planned markers and
landmarks. This value 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 registration has been satisfactorily veri-
fied.
Due to error propagation, navigation accuracy may be degraded compared to
the accuracy achieved at the landmark positions, and at the areas where the ac-
curacy was checked.
Software User Guide Rev. 1.0 Kolibri cranial/ENT Ver. 2.7
Deviation
< 3.0 mm
3.0 mm - 8.0 mm
> 8.0 mm
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