The use of portable intraoperative computed tomography scanning for real-time image guidance: A pilot cadaver study

Authors: Das, Subinoy¹; Maeso, Patricia A.¹; Figueroa, Ramon E.²; Senior, Brent A.³; Delgaudio, John M.⁴; Sillers, Michael J.⁵; Schlosser, Rod J.⁶; Kountakis, Stilianos E.¹

Source: American Journal of Rhinology, Volume 22, Number 2, March/April 2008 , pp. 166-169(4)

Publisher: OceanSide Publications, Inc

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Abstract:

Background: This study was performed to assess the feasibility of using intraoperative computed tomography (CT) to provide real-time updates to image guidance systems (IGSs) during surgery.

Methods: The xCAT ENT portable intraoperative CT scanner (Xoran Technologies, Ann Arbor, MI) was used to acquire scans before, midway, and at the end of six cadaver dissections during the Southern States Rhinology Course, Augusta, GA, in October 2006. These scans were used to recalibrate three different IGSs used during the dissection. Time measurements were recorded and dosimetry was obtained from the cornea, sphenoid sinus (near the optic chiasm), and from the operative field during acquisition of the images. IGS accuracy was determined at the skull base and lamina papyracea. Surgeons were interviewed on benefits of real-time updates to the IGS after completion of dissections.

Results: The xCAT ENT scanner was compatible with all three IGS platforms. The average time to update the IGS was 13 minutes. Radiation doses to the cornea were 620 mrad per scan, and optic chiasm was 800 mrad/scan. The accuracy at the anterior skull base improved from 1.58 to 0.62 mm (p = 0.026). The accuracy at the posterior skull base improved from 1.46 to 0.71 mm (p = 0.014). The accuracy at the lamina was not significantly changed.

Conclusion: Intraoperative portable CT scanning with real-time IGS updates is feasible and likely would add little additional time. Accuracy is improved at the skull base. Prospective studies on actual patients are warranted.

Keywords: Computed tomography; image guidance; intraoperative; real-time; sinus surgery; technology; xCAT ENT

Document Type: Research article

DOI: 10.2500/ajr.2008.22.3152

Affiliations: 1: Department of Otolaryngology-Head and Neck Surgery, Medical College of Georgia, Augusta, Georgia 2: Department of Radiology, Medical College of Georgia, Augusta, Georgia 3: Department of Otolaryngology-Head and Neck Surgery, University of North Carolina at Chapel Hill, North Carolina 4: Department of Otolaryngology-Head and Neck Surgery, Emory University School of Medicine, Atlanta, Georgia 5: Alabama Sinus and Nasal Center, Birmingham, Alabama 6: Department of Otolaryngology-Head and Neck Surgery, and Medical University of South Carolina, Charleston, South Carolina

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