Use of anatomic or invasive markers in association with skin surface registration in image-guided surgery of the temporal bone.
CONCLUSIONS
The use of an invasive marker in the ipsilateral temporal bone with mid-facial skin contouring for registration improved the position accuracy (PA) to levels required for otological and neuro-otological procedures.


OBJECTIVE
The aim of this study was to compare the PA after skin contouring with the combination of anatomic landmarks or a local invasive marker and skin surface registration for intratemporal computer-assisted navigation.


METHODS
Thirty-three patients undergoing a lateral skull base procedure with the Digipointeur system (Collin, Bagneux, France) based on CT scan were included in this study. Registration was obtained by a mid-facial skin contouring. In the first protocol (n=8), PA was evaluated and the position corrected for three intratemporal landmarks before evaluation of the target (round window). In a second protocol (n=25), a titanium screw was placed in the ipsilateral mastoid region before imaging. PA was measured before and after screw registration for five intratemporal landmarks.


RESULTS
In the first protocol, PA did not improve after the registration of the landmarks, and PA of the target was evaluated as 4.9+/-0.64 mm. In the second protocol, PA was reduced after screw registration for all landmarks with a mean PA ranging from 0 to 2.3 mm.
Grayeli
Alexis Bozorg
AB
Otolaryngology Department, AP-HP, Beaujon Hospital, Clichy, France. alexis.bozorg-grayeli@bjn.aphp.fr
Esquia-Medina
Gonzalo
G
Nguyen
Yann
Y
Mazalaigue
Stéphane
S
Vellin
Jean-Francois
JF
Lombard
Bertrand
B
Kalamarides
Michel
M
Ferrary
Evelyne
E
Sterkers
Olivier
O
D000328:Adult; D001863:Bone Screws; D019929:Cochlear Implantation; D006801:Humans; D011446:Prospective Studies; D025321:Surgery, Computer-Assisted / Q000592:standards*; D013701:Temporal Bone / Q000000981:diagnostic imaging / Q000601:surgery*; D014025:Titanium; D014057:Tomography, X-Ray Computed
D014025:Titanium