80 Software User Guide Rev. 1.0 Kolibri cranial/ENT Ver. 2.7
Introduction to Surface Matching Registration
Introduction to Surface Matching Registration
About Surface Matching Registration
Overview With surface matching registration, you scan anatomically important surfaces of the pa-
tient’s head using
z-touch
or
Softouch
.
The software uses a surface matching algorithm to match the patient’s anatomy to the pre-
operative CT/MR images. Only anatomical surface points included in the CT/MR image
sets can be acquired and used for the surface matching algorithm.
Before You Begin
Make sure that the patient’s anatomy has not changed from the scan. This
would result in incorrect registration and navigation.
Verify that the registration device (
z-touch
/
Softouch
) is functioning properly.
Advantages • Skin shift is reduced (when using
z-touch
or
Softouch
)
• CT/MR (fiducial) markers are not required
NOTE: The pointer can also be used for surface matching registration, however for best
results, we recommend using the
z-touch
or
Softouch
.
Surface Matching
Methods
Method Description
z-touch
z-touch
emits an infrared laser beam which is detected by the cam-
era. You acquire points by scanning the patient’s head.
Softouch
Softouch
is an electronic pointer with a skin detection sensor. An
infrared signal emitted from
Softouch
triggers the camera to regis-
ter the point the moment the pointer touches the skin.
Combining
z-touch
and
Softouch
You can use
z-touch
and
Softouch
point acquisition in combina-
tion with each other. This is useful if characteristic surface match-
ing points are not accessible with
z-touch
(e.g., required areas are
covered by hair or locations where the infrared laser point cannot be
detected by the camera).
You can switch between registration modes by pressing either
z-touch
or
Softouch
in the
Patient Registration
dialog.
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