The impact of fiducial distribution on headset-based registration in image-guided sinus surgery.
OBJECTIVE
The objective of this study was to assess registration error due to fiducial configuration for the ENT headsets for the CBYON Suite (CBYON, Mountain View, CA) and InstaTrak (GEMS Navigation and Visualization, Waukesha, WI).


METHODS
Axial CT scans (1-mm slice thickness) were obtained of for 24 cadaveric heads using the CBYON headset and for 23 cadaveric heads using the GEMS headset. The CBYON and GEMS NAV software were used to calculate the fiducial registration error (FRE). Fiducial localization error (FLE) was estimated from FRE. Theoretical target registration error (TRE) was calculated at 11 targets.


RESULTS
The FRE for CBYON and GEMS NAV was 0.69 mm and 0.27 mm, respectively. The theoretical TRE for CBYON and GEMS NAV was 0.41 mm and 0.30 mm, respectively. The theoretical TRE was greater at targets posterior in the sinus cavities.


CONCLUSIONS
Theoretical TRE values for both ENT headsets are less than clinically observed TRE. Clinically observed TRE is likely due to repositioning accuracy.


METHODS
B-2.
Knott
P Daniel
PD
Head and Neck Institute, Cleveland Clinic Foundation, Cleveland, OH 44195, USA.
Maurer
Calvin R
CR
Gallivan
Ryan
R
Roh
Hwan-Jung
HJ
Citardi
Martin J
MJ
D002102:Cadaver; D006801:Humans; D008953:Models, Anatomic; D008962:Models, Theoretical; D013517:Otorhinolaryngologic Surgical Procedures / Q000295:instrumentation*; D010256:Paranasal Sinuses / Q000601:surgery*; D013238:Stereotaxic Techniques / Q000295:instrumentation*; D025321:Surgery, Computer-Assisted / Q000295:instrumentation*